Reverberatory furnace for remelting of aluminium scrap

FIELD: metallurgy.

SUBSTANCE: furnace consists of a case made with refractory external side, front and back end walls, a storage bath and an inclined platform restricted with a sole and walls, two drain tapholes, a rotating pan, a gas duct and a welded frame whereon everything is arranged. The furnace case is fitted by a welded steel box equipped with heat insulation between the box and each wall consisting of double heat insulation mullite fibreglass layer and of sheet asbestos cardboard. The storage bath and the inclined platform are made from mullite corundum blocks of increased density which are laid on the heat insulation mullite fibreglass layer and light brick. The furnace case is filled by concrete with the filler from crushed light fire brick, the crown above the inclined platform and the bath has heat-insulation plaster above which double layer of refractory heat-insulation mats is laid. One side wall of the furnace is provided with two injection ten-mixer medium-pressure burners directed at an angle to the inclined platform while another side wall is furnished with one injection ten-mixer burner directed at an angle to the inclined platform and one 19-mixer burner directed to the furnace bottom, a reheat chamber lined by refractory bricks to house a four-mixer gas injection burner, an air blower, two tapholes in the side walls to let out the molten metal made in the quick-change taphole bricks.

EFFECT: higher furnace efficiency, reduced heat and burn-off losses and possibility of ecologically clean remelting of aluminium scrap.

7 cl, 12 dwg

 

The invention relates to ferrous metallurgy, namely the melting units for secondary remelting of aluminum scrap and waste of aluminium alloys in ingots and ingots. The oven can be used for refining, making alloys, averaging the chemical composition of the scrap.

Known analog - reflective furnace for melting metal (information source RF patent №2155304), comprising a housing formed of brick masonry exterior walls, as stated in the furnace, the cumulative tub and sloping terrain limited the hearth and walls, vault, drain and tapped the flue.

The disadvantages of this furnace are:

1. The complexity of the design due to the presence of two sets (small over the boot table and a large over bath).

2. No external insulation of the oven, reducing heat loss to the external environment.

3. Oven does not have a dust removal system and when the work will pollute the environment with harmful emissions.

4. From the description of the furnace, it follows that it is equipped with only one nozzle. This is clearly not enough to ensure high-speed penetration of the charge and management of the forced mode of fusion. Due to the above disadvantages of the furnace can not provide the solution of the technical problem.

Known analog - reflective furnace for melting metal (information source RF patent №2047663), comprising a housing formed of brick masonry exterior walls, as stated in the furnace, the cumulative tub and sloping terrain limited the hearth and walls, vault, drain and tapped the flue.

The furnace is for melting recycled aluminum and has the following disadvantages:

1. The high cost and complexity accumulates teplopodachi (lightweight refractory bricks, Blums). The depth of the liquid metal in the bath makes the mixing process, resulting in the liquid metal will not be homogeneous.

2. No external insulation of the oven, reducing heat loss to the external environment.

3. Oven does not have a dust removal system and when the work will pollute the environment with harmful emissions.

4. In the furnace using a stationary chute for discharging the molten metal.

Due to the above shortcomings, it is impossible to obtain a technical result.

Known analog - reflective furnace for melting metal (information source RF patent №2361162), which is the closest (prototype), comprising a housing formed of refractory outer side, front and rear end walls, as stated in the furnace, the cumulative tub and sloping terrain limited the hearth and walls, vault, drain and tapped the gas duct, and the body placed on the welded frame. Furnace, taken as a prototype, has the following disadvantages:

1. Oven does not have a camera the afterburners and installation of dust removal.

2. The furnace has high performance, but the performance can still be increased.

3. The furnace has a satisfactory tightness. Due to the special design of the valve working and slag Windows you can create an airtight oven, allowing to reduce the emissions of harmful gases into the atmosphere to reduce the metal loss and heat into the environment.

4. The furnace has rung with the sloping ground to the furnace hearth, which is not possible with a forklift with a scraper to clean the bottom and an inclined platform (i.e. to mechanize the process of cleaning bottoms and sloping platforms).

5. In the furnace hearth used blocks mCRs-50, have a great life, however, using other hearth blocks for the bottom and an inclined platform, you can increase the life of the furnace.

The objective of the invention is the creation of high-performance gas bath reflective type furnace for melting aluminum scrap with the camera, after-burners, installation of gas cleaning, sealed to reduce the emissions of harmful gases into the atmosphere to reduce the metal loss and heat into the environment, as well as to increase the period of its operation.

The technical result - designed furnace is sealed, has a long service life, high performance, allowing you to use desertraven the th from foreign inclusions scrap, to reduce heat loss to the environment due to the special insulation, lead the process of remelting on natural and artificial thrust with afterburning chamber and installation of dust removal, making it environmentally friendly.

This technical result is achieved due to the fact that in a reverberatory furnace for melting aluminum scrap, comprising a housing formed of refractory outer side, front and rear end walls, cumulative tub and sloping ground, limited hearth and walls, vault, drain tap-hole and duct according to the invention, entered welded frame filled with concrete filler: crumb lightweight refractory bricks, cumulative bath and inclined platform made of mullitokorundovye value-dense blocks MQFP-88, laid on the insulating mullite brand MLF-260 fiberglass layer and lightweight brick SHL-0,9. Concrete filler: crumb lightweight refractory bricks, mullite insulation brand MLF-260 fiberglass layer and lightweight brick SHL-0,9 under the furnace hearth and under the inclined platform allow to reduce losses of heat to keep the temperature of the metal in the bath and an inclined platform. The service life of the furnace is increased due to the use of mullitokorundovye value-dense blocks MQFP-88, which are the second resistance and durability (service life for practical data 8-8,5 years).

In addition, the reflective furnace for melting aluminum scrap has in one side wall of the two injection datetimevalue burner medium pressure directed at an angle onto the sloping ground, the other side wall of one injection datetimevalue burner with a smooth inner surface mixers aimed at an angle on the sloping ground, and the other 19-mixing, aimed at the furnace hearth furnace. 19-mixing burner is in the center of seven mixers with nozzles that allow you to get a torch length of 2.8 meters, other mixers are used without the tips and have a torch length of 1.5 meters, two datetimevalue burners are in the top row five mixers made with ribs at their ends inside the Central channel, giving a combustion gas-air mixture long torch 2,4 meters, mixers, located in the bottom row allow you to get a torch length of 1.3 meters. This arrangement of the burners allows for high speed melting, reduction of waste (for practical data), and download uncontaminated furnace through the slag box and quickly be melted due to the heat released during the burning torch 19-mixing burners. thermal capacity of the burner is 7540 kW, which makes high-performance furnace, allowing rapid melting conditions.

This OTP is satelina furnace for melting aluminum scrap has two entrances on the front (rear) wall to release molten metal, made in the quick-change tap the bricks, and each of the tap brick is placed in welded box gunning brick, which has a flared with four holes for mounting to the duct furnace, in addition, the oven has two lined rotary bowl with welded thereto lined swivel chute, which can be rotated in the process of casting molten metal and simultaneously to provide a casting weld metal in the furnace to a pouring equipment.

Moreover, to the frame of the furnace welded steel box with insulation between them and each wall consisting of a double insulating mullite brand MLF-260 fiberglass layer and sheet assocarta. This design significantly reduces heat loss to the environment.

Significantly noted that the roof of the furnace has a refractory heat-insulating coating and top it stacked insulating mullite brand MLF-260 fiberglass layer with a thickness of 30 mm, This further reduces heat loss from the oven.

Next, the furnace has a hydraulic lifting and lowering of the working valve of the furnace, consisting of two power cylinders, oil pump, brackets, rotatable on axes which are welded to the kiln shell and cast iron valves with double insulation mullite brand MLF-26 fiberglass layer, lined with lightweight single refractory brick, and the lining is behind the plane of the flap 30 mm and when the closure is formed of a reliable "l-shaped castle, which helps reduce smoke and heat from the furnace. Flap slag box furnace has a frame, lined with lightweight single brick, acting for the frame 30 mm, and the frame has two screw on each side, welded to it, moving the copier, thus closing the slag box is formed reliable "l-shaped castle, which helps reduce smoke and heat from the furnace. Actuator for raising and lowering the valve slag box furnace consists of: an electric motor, a clutch, a worm gear, a drum, a counterweight rope pulley and damper with the insulating layer.

It should be noted that the reflective furnace for melting aluminum scrap fitted lined with refractory brick chamber for afterburning, which is equipped with gas chetyrehsotletny injection burner nozzles, the afterburning chamber has a side wall door lined with lightweight refractory bricks, which is opened and closed manually, and placed on top of the blower.

When escaping from the chamber for afterburning the flue has a sliding cover which is raised and lowered manually by means of a counterweight.

Nakane is, a reverberatory furnace is supplied with installation of dust removal to achieve environmentally friendly process, and installation of dust removal has two identical blocks combined into one whole design of gas cleaning, in blocks placed two rotating grille and eighteen cartridge filters, in addition, the installation has a service area for maintenance work on the blowers and blocks, service area for loading of the adsorbent in blocks dust removal and common stairs.

Introduction to the design of the furnace above listed equipment, materials, etc. provides a solution to the task.

The presence of an inclined platform, gradually turning into the furnace hearth, which allows you to be melted in the furnace unsorted from foreign inclusions scrap because of alterations (iron and steel rings, liners, sleeves, rods, tappets, valves, etc.) do not fall into the molten metal, and can be cleaned with a forklift equipped with a scraper.

Figure 1 - view of the furnace in the plan.

Figure 2 is a longitudinal section a-a furnace.

Figure 3 - a view B of the furnace.

Figure 4 is a view In the furnace from the side of the working window.

Figure 5 - 19-mixing burner.

Figure 6 - section G-G 19-mixing burners.

7 - double-row datetimevalue burner nozzles.

On Fig - double-row datetimevalue burned is and without attachments.

Figure 9 - double-row chetyrehsotletny burner nozzles.

Figure 10 - installation of dust removal (front view).

Figure 11 - view of E installation of dust removal.

On Fig - type furnace in terms of the filling equipment and installation of dust removal.

The proposed furnace contains: mounted on the frame 1 is filled with concrete filled crumb lightweight refractory bricks, building, educated brickwork exterior side, the front 2 and rear end walls 3.

Under 4 of the furnace and the sloping site 5 have a smooth transition and made mullitokorundovye value-dense blocks MQFP-88 6 laid on the insulating mullite brand MLF-260 fiberglass layer 7 and lightweight brick SHL-0,9 8 (figure 2). Mullite insulating mark MLF-260 fiberglass layer 7 with a thickness of 30 mm is obtained by rolling on the frame 1 rolls mullite insulating fiberglass material brand IM-260 width 1400 mm, length 15000 mm, thickness 30 mm, Frame 1 is made of h I-beams No. 40 SHZ, filled with concrete 9 filled crumb lightweight refractory bricks and reinforced area of 90×90 10. Concrete 9 filled in the frame 1 with the filler-crumb lightweight refractory bricks, mullite insulation brand MLF-260 fiberglass layer 7 and lightweight brick 8 under one of the th 4 and under the inclined platform 5 can reduce heat loss, to keep the temperature of the metal in the bath and an inclined platform. The service life of the furnace is increased due to the use of mullitokorundovye value-dense blocks MQFP-88, which have high resistance and durability (service life for practical data 8-8,5 years). Application mullitokorundovye value-dense blocks MQFP-88 (large: length 1000 mm, width 400 mm, depth 300 mm, small: length 500 mm, width 400 mm, thickness 300 mm) instead of the usual piece goods, you can reduce the number of seams that reduces permeability and increases the slag lining; obtain savings by eliminating the process of pre-production piece refractory to perform units of almost any configuration, speed up the construction process and to reduce the share of manual labor. The joints between mullitokorundovye value-dense blocks MQFP-88 fill pulverized dry fireclay powder, and an even better result was achieved by the author, when buried in the slit blocks bottoms and sloping ground chamotte powder in the upper part filled with liquid glass and then Tamazula surface flush with the top plane of the bottom and an inclined platform refractory adhesive mastic.

As the binder used refractory composition comprising a refractory clay (23%), refractory powder (73%), MS is anyone glass (3%) and Toscana (alumbramiento mixture, 1%).

The thickness of seams 1-2 mm, thermocompensation seams are not. On the metal frame 1 of the furnace is lined with four walls, at 4, inclined platform 5. The frame 1 of the furnace is poured concrete grade B22,5 filled crumb lightweight refractory bricks. Excess concrete B22,5 filled crumb lightweight refractory bricks - remove a line from the surface of the frame 1. The horizontal portion of the bottom 4 consists of seven rows mullitokorundovye value-dense blocks MQFP-88 three pieces in each row, the inclined part of the bottom 4 has three rows, three in each row, placed on a die. The size of the bottom 3×2.8 m. The sloping site 5 consists of seven rows of bottom mullitokorundovye value-dense blocks MQFP-88, laid on a die. The size of the inclined platform 3×2.8 m. Hearth blocks lined with direct fireclay brick stamps SHA-1 item # 5 GOST 8691-73. The walls of the furnace lined with refractory brick SHA-1 No. 5 and No. 12 GOST 8691-73 in a steel box 11. When this reflective furnace for melting aluminum scrap has two entrances in the rear wall 3 to release molten metal, designed in quick-change tap the bricks 12, each of the tap brick 12 is welded in box 13 of the tap bricks 12, which has a flared with four holes for fastening to steel duct 11 of the furnace, in addition, the oven has a d is e lined rotary bowl 14 welded thereto lined swivel chute 15, which can be rotated in the process of casting molten metal and simultaneously pour weld metal in the furnace to a pouring equipment. Rotary bowl 14 has a bottom welded to the roller 16, which is included in the sleeve 17 and is rotated therein, and the sleeve 17 is welded to the bracket 18, the latter is welded to the frame 1.

As described above, each of the tap brick 12 is welded in box 13 of the tap brick 12 in the clutch the rear wall 3 is placed in a niche, with four studs 19 which are welded to the steel duct 11, the furnace is fixed in hole flanging welded boxes 13 and mounted on a steel box furnace 11 four nuts 20. On welded duct 13 of the tap bricks 12 are welded two handles (not shown), with which you can retrieve and set the tap brick 12, which is welded in the frame 13, in a niche of the furnace. Each years shuts up lance. The walls of the furnace lined with two bricks.

To the frame 1 of the furnace welded steel box 11 of the furnace, with insulation between them and each wall consisting of a double insulating mullite brand MLF-260 fiberglass layer and sheet assocarta 21. This design significantly reduces heat loss to the environment.

Mounting steel box furnace 11 to the frame 1 of the furnace is a vertical channels 22 No. 16.

To prevent the Oia thrust masonry furnace vertical bars have a bunch of horizontal channels 23 No. 16 of figure 2, 3.

Working 24 and slag 25 Windows have the arches 26 and 27, respectively, lined templates from fireclay end of the wedge SHA-1 # 22 and # 23 2, 3. Next, the furnace has a hydraulic lifting and lowering of the working valve 28 of the furnace, consisting of two power cylinders 29, the oil pump (not shown), four brackets 30, a rotating axis 31, welded from one side to the vertical channels 32, and the other to work the flap 28 of the furnace. Working furnace damper is molded of heat-resistant cast iron brand CH has a double insulation mullite brand MLF-260 fiberglass layer, lined with lightweight single refractory brick brand SHL is 0.9, and the lining is behind the plane of the flap 30 mm and when the closure is formed of a reliable "l-shaped castle, which helps reduce smoke and heat from the furnace. Flap 33 slag 25 box furnace has a frame, lined with lightweight single brick brand SHL 0,9 acting for the frame 30 mm, and the frame has two slider 34 on each side, welded to it, moving on copiers 35, thus closing the slag box is formed reliable "l-shaped castle, which helps reduce smoke and heat from the furnace. Actuator for raising and lowering the valve 33 slag 25 box furnace consists of: an electric motor 36, the clutch 37, the worm gear 38, the drum 9, counterweight 40, the cables 41, pulleys 42 and valve 33 to the insulating layer 1, 3.

A reverberatory furnace for melting aluminum scrap fitted lined with refractory brick afterburning chamber 43, in which is installed a gas chetyrehsotletny injection burner 44 figure 9. The afterburning chamber has a side wall door 45 for cleaning it from dust, soot, lined with lightweight refractory bricks, which opens and closes manually. Additionally, the necessary air for combustion is supplied by blower 46 figure 4.

When escaping from the chamber for afterburning 43 flue 47 has a gate valve 48, which is raised and lowered manually by means of a counterweight 49 1, 3, 9.

In addition, the reflective furnace for melting aluminum scrap has in one side wall of the two injection datetimevalue burner medium pressure 50, oriented at an angle to the inclined area 5, in the other side wall of one ten injection mixing burner 51 with a smooth inner surface mixers aimed at an angle on the sloping ground, and the other 19-mixing 52 towards the furnace hearth 4 of the furnace 1. 19-mixing burner is in the center of seven mixers with nozzles 53 and 54, which provide a torch length of 2.8 meters, the rest of the mixers 55 used without the tips and have a torch length of 1.5 is the European part of Russia (the burner was investigated in the laboratory LLC Ensaplv" at the research bench) 5, 6. Datetimevalue burner medium pressure are in the top row five mixers 56, made with ribs 57 on their ends inside the Central channel, giving a combustion gas-air mixture long torch 2,4 meters, mixers 58, located in the bottom row allow you to get a torch length of 1.3 meters 7. Datetimevalue burner 51 with a smooth inner surface mixers aimed at an angle to the inclined area 5, has the same dimensions with datetimevalue burners 50, as the mixers 58, located in the bottom row of the previous burners, mixers burner 51 allow you to get a torch length of 1.3 meters Fig. Faucets all burners are: inner diameter 42 mm, external 66 mm, four nozzles with a diameter of 1.4 mm

This arrangement of the burners allows for high speed melting, reduction of waste (for practical data), and download uncontaminated furnace through the slag 25 window and quickly be melted due to the heat released during the burning torch 19-mixing burner 52. The total thermal power of the burner is 6240 kW, which makes high-performance furnace, allowing a forced mode of melting, the metal does not have time to oxidize and, ultimately, the frenzy is small. The shape and size of different burners, and the device is the same. So devyatnadtsatiletnyaya the burner to medium pressure like the other three, has a burner tunnel 59 for sustained burning torch, made of stainless chromium-Nickel steel, and the casing 60 for gaskets between mixers refractory ramming mass 61. Gas enters the distribution box 62 by fitting 63.

Nominal working pressure all burners 0.08 MPa. When the furnace in four aperture stacked four injection burners and large overlap mullitokorundovye value-dense blocks MQFP-88. Then there is a covering of burners refractory ramming mass private development, having the following composition:

Quartz sand;

The fireclay mortar MS 39 THE 14-199-119-200;

Lignosulfonate THE technical 13-0281036-89;

Powder powdered clay FCB TU 1522-009-00190495-99;

Foscan (alumbramiento mix) THE 2149-150-10964029-01

A large body 64 is made on the template (the wheel) of the wedge end SO No. 22, No. 23 and has a coating 65, having the following composition:

- asbestos crumb - 85%;

- liquid glass - 5%;

- fire clay - 5%;

- sand - 5%

is water.

Top coating stacked insulating mullite brand MLF-260 fiberglass layer 66 with a thickness of 30 mm, which further reduces the heat loss from the furnace. Pyatov beams (not shown) are welded from channel No. 27.

Flue gas cleaning from dust and harmful substances occur which result in the installation of dust removal, developed by the author and shown on figure 10, 11, which has a wide range purify harmful substances in the flue gases. As the number of flue gases formed during the smelting furnace is large, it is United by two identical block 67 dust removal one full design of gas cleaning, which has a service area 68 for preventive maintenance on the blower 69 and the blocks 67, service area 70 for loading of the adsorbent in blocks 67 dust removal and General ladder 71 on which the operator rises to serving platforms 68 and 70. Each block dust removal is a prefab steel square section body, the bottom of which is a rotary boot grating 72 with holes for filling of the adsorbent. The rotation of the grating about an axis by using arm 73 mounted on the axis 74. Above the rotary boot lattice is bootable pipe 75. Inside the upper part of the block 67 posted by cartridge filters in the number of 18 pieces, which trap dust particles from flue gases.

In the upper part of the block 67 is attached to four brackets 76 maintenance platform 68, which rests on four pillars 77. On the platform 68 fixed frame 78 on which is mounted a blower 79 with elektrodvigatel the m 80 11. The spent adsorbent and the dust is collected in the lower part 81 of the block 67. The cleaned gases are supplied in each unit 67 installation of dust-gas through the nozzles 82. After the installation of gas cleaning for 5 days, turning the knob 73 boot grating 72 of each block 67, the spent adsorbent (activated carbon, silica gel, birch charcoal, lime "pushonka") is poured into the lower part 81 of the block 67. Then you turn the handle 83 of the nozzle for discharging the spent adsorbent and the dust from the cartridges fed from the lower portion 81 of the block 67 in the container 84. To service cartridge filters available at the top of the block 67 manhole closed by a cover 85. The cleaned flue gases are supplied through the pipe 86 into the blower 79. In accordance with the requirements of the t/b serving platforms 68 and 70 have the fence 87. Main technical characteristics of the installation of dust removal:

- performance on clean gas 18 800 m3/h;

- the surface area of the filtering 24,8 m2;

the number of cartridge filters 18 pieces;

- the thickness of the layer of adsorbent 0.3 to 0.35 m;

the degree of purification by hydrogen fluoride 73%;

the degree of purification of copper oxide 87%;

- purification of carbon monoxide 94%;

the degree of purification of nitric oxide 86%;

the degree of purification on alumina 81%;

the degree of purification by dust 94%;

- the temperature of cleansing the constituent gas from 20 to 100°C.;

the temperature of the outer surface of installation

from 45 to 55°C;

- the sound level of 80 dBA;

energy costs for cleaning 6 kW/h

Before installing dust removal installed the mixing chamber 88 in which the gate 89 is designed to regulate the flow of flue gases in the installation of gas cleaning, and the gate 90 for mixing flue gas with air shop Fig. For discharge of flue gases in the installation of gas cleaning is the exhauster DN-12 91, before entering the chimney 92 on the tube 93 has a gate 94, and a metal box 95 gate 96. For maintenance of gates 94 and 96 provides maintenance platform 97 staircase 98. In addition to the gate 94 of the pipe 93 has a gate 99.

The oven operates on natural draft, as follows.

The smelter metal and alloys opens the gates 94 and 99, the gates 89 and 96 are closed, while the draught of the furnace should be 2-20 daPa. The gas is supplied, includes burner and made red-hot oven for technological schedule calcination depending on the type of repair. After calcination enables the lifting mechanism of the valve of the working window 24 and calcined in a furnace in an inclined pad 5 through the working window 24 is loaded by the loader aluminum scrap. The flame three gas injection burners 50, 51 heats the scrap prior to melting. The metal melts and flows down Naklo the Noah platform 5 at 4 furnace. The accumulation of molten metal in the furnace hearth furnace 4 is loaded into the slag box 25 scrap that is melted by the flame of the burner 52. The hot flue gases rise and are included in the afterburning chamber 43, in which burnt and the pipe 93 are removed to the atmosphere through the flue pipe 92. The layer of coating 65 large arch 64, mullite insulation brand MLF-260 fiberglass layer 66 with a thickness of 30 mm, wall insulation, bottom 4, an inclined platform 5 and insulating layers on the frame 1 of the furnace provide high thermal insulation of the melting unit. At the same time the concrete frame of the furnace filled with crushed lightweight refractory bricks, mullite insulation brand MLF-260 fiberglass layer 7 and lightweight brick SHL-0,9 8 provide additional thermal resistance to heat flow emanating from the inclined platform 5 and the bottom 4 down to the Foundation. In the process of melting the scrap is melted, and on a sloping site 5 all remain inclusion melting point which is higher than the aluminum alloy. These wastes (alteration: iron and steel rings, liners, sleeves, rods, tappets, valves, etc.) do not fall into the molten metal, as at the end of the melting them removed from sloping ground scraper mounted on the truck. After complete melting loaded into the furnace scrap processing liquid flux IU is Alla, thorough mixing of the metal in the bath and confirmation by laboratory spectral analysis marks obtained alloy, Zalewski metal opens notches and produces the casting of liquid metal in the mold filling carousel 100 and filling of the conveyor 101. After pouring from the furnace liquid metal smelter metal opens the valve 33 slag window 25 and cleans the furnace hearth 4 from slag and accidentally got on her alterations.

The oven on artificial draught is as follows.

The smelter metal and alloys closes the gate 99 and gate 94, and the gates 89, 96 when it opened. Operations are the same as in the smelting of natural draught. The difference is that before loading the charge into the furnace is loaded adsorbent with a service platform 87 in the installation of gas cleaning and produced by its inclusion, it also enables the fan 91. The products of combustion, after passing the mixing chamber 88, diluted in air of the shop, then are cleaned from dust and harmful compounds in the installation of dust removal and forced by fan 91 and blowers 79 metal duct 95 in the flue pipe 92.

The principle of operation of gas cleaning consists of the following: flue gases pass through the layer of adsorbent on the boot gratings 72, forming a "fluidized bed", resulting in harmful substances, ahogadas is in flue gases, adsorbed lime pushonkoj, activated carbon, silica gel, birch charcoal. After purification of flue gases from harmful substances they are cleaned from dust in 18 of cartridge filters. Every 5 days there is a replacement of the spent adsorbent with a new one.

1. A reverberatory furnace for melting aluminum scrap, comprising a housing formed of refractory outer side, front and rear end walls, a limited hearth and walls of the cumulative tub, vault, drain tapped flue, characterized in that the furnace body is placed on the welded frame, filled with concrete filled with crumbs lightweight refractory brick, with cumulative bath and inclined platform made of mullitokorundovye blocks of high density MQFP-88, laid on the insulating mullite glass-fiber layer brand MLF-260 and lightweight brick SHL-0,9, to the frame of the furnace welded steel box with insulation between him and each wall consisting of a double insulating mullite glass-fiber layer brand MLF-260 and sheet assocarta, the furnace has in one side wall of the two injection datetimevalue burner medium pressure directed at an angle onto the sloping ground, the other side wall of one injection datetimevalue burner with smooth in the morning surface mixers, aimed at an angle on an inclined platform, devyatnadcatiletnie burner, aimed at the furnace hearth furnace, lined with refractory brick chamber for afterburning, which is equipped with gas chetyrehsotletny injection burner nozzles, and the afterburning chamber has a side wall door, lined with lightweight refractory bricks, which is opened and closed manually, and placed on top of the blower, while the oven is working and the slag box.

2. Furnace according to claim 1, characterized in that it has a hydraulic lifting and lowering of the working valve of the furnace, consisting of two power cylinders, oil pump, brackets, rotatable on axes which are welded to the body of the furnace, and cast iron valves with double insulation mullite glass-fiber layer brand MLF-260, lined with lightweight single refractory brick, and the lining is behind the plane of the flap 30 mm with education at closing reliable G-shaped lock to reduce smoke and heat from the oven.

3. Furnace according to claim 1, characterized in that the damper slag box furnace has a frame, lined with lightweight single brick, acting for the frame 30 mm, and the frame has two screw on each side, welded to it, moving the copier, with the formation of closing the slag box is EDINOGO the l-shaped lock to reduce smoke and heat from the furnace, and drive the raising and lowering of the valve slag box furnace includes a motor, a clutch, worm reducer, drum, counterweight, ropes and pulleys.

4. Furnace according to claim 1, characterized in that it has two entrances in the rear end wall for the release of the molten metal in the quick-change tap the bricks, with each of the tap brick placed in welded box gunning brick, which has a flared with four holes for mounting to the duct furnace, and two lined rotary bowl with welded thereto lined swivel chute made with the possibility of rotation in the process of casting molten metal with providing casting weld metal in the furnace to a pouring equipment.

5. Furnace according to claim 1, characterized in that the vault has a refractory heat-insulating coating and top it laid mullite insulating fiberglass layer brand MLF-260 thickness of 30 mm

6. Furnace according to claim 1, characterized in that it is provided with installation of dust removal, consisting of two identical units, combined into a single structure, the blocks are placed two rotating grille and eighteen cartridge filters, with the installation of gas cleaning has a service area for maintenance work on the blowers and blocks, service area to download adsorbed the and blocks dust removal and shared platforms stairs.

7. Furnace according to claim 1, characterized in that devyatnadtsatiletnyaya burner is in the center of seven mixers with nozzles that provide a torch length of 2.8 meters, and other mixers without nozzles with a torch length of 1.5 meters, two datetimevalue burners are in the top row five mixers made with ribs at their ends inside the Central channel, for receiving the combustion gas-air mixture long torch 2,4 meters and mixers that are in the bottom row, provide a torch length of 1.3 meters.



 

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EFFECT: higher power and fuel efficiency, and temperature difference.

FIELD: metallurgy.

SUBSTANCE: proposed furnace comprises body arranged at welded frame and composed of refractory outer lateral, front and rear end walls, accumulation wall and inclined platform confined by hearth and walls, crown, working and spare drain notches, working and slag opening shutters, rotary bowl and gas duct. Furnace has outer heat insulation of walls consisting of asbestos grit, dual layer of refractory mats and dual layer of asbestos cardboard sheets. Accumulation bath and inclined platform are made from corundum blocks laid on the layers of asbestos cardboard and light brick. Furnace frame is filled with concrete with filler from fireclay and asbestos grit. Crown above inclined platform and bath has heat-insulation plaster above which dual layer of refractory heat-insulation mats is laid. One lateral wall of the furnace if provided with two injection eight-mixer medium-pressure burners directed at angle to inclined platform while another lateral wall is furnished with on injection eight-mixer burner directed at angle to inclined platform and another 17-mixer reheat chamber directed to furnace hearth lined by refractory bricks to house sin-mixed gas injection burner, air blower, and waste gas heater arranged above said chamber. Notches in lateral wall for release of fused metal are made in fast-replace notch bricks.

EFFECT: higher efficiency, reduced heat losses.

7 cl, 10 dwg

FIELD: heating.

SUBSTANCE: furnace includes a housing formed with side, front and rear external end refractory walls, a storage bath that is restricted with a bottom and walls, an inclined platform, an arch, a drain tap-hole and a gas duct. The housing is arranged on a welded concrete-cast frame with filler from diatomite chips and provided with two heat-insulating layers from light brick and asbestos board plates under the bottom, two heat-insulating layers from light brick and four layers of asbestos board plates under the inclined platform. The storage bath and the inclined platform are made of mullite-corundum blocks MKP-72 laid on three layers of asbestos board and have packing from diatomite chips, which are mixed with crushed asbestos chips. The furnace has lower and upper large arches located one above another so that a gap for a flue gas duct is formed between them. The furnace is equipped with a rotating chute having the possibility of being turned during liquid metal pouring and having an intermediate nose, a rotating bowl with a shaft welded in its lower part, the end of which is pressed into an inner shell of a ball bearing, and its outer shell is fixed in a bracket fixed in the rear wall of the furnace; at that, a long pouring nose with two handles is welded to the turning bowl for series pouring of metal molten in the furnace to the pouring equipment located in the service sector at an angle of 140°. Front wall of the furnace is provided with a row of injection burners of intermediate pressure, out of which two eight-mixer burners with long flame are directed on edges to the charge contained on the inclined platform and to the bath with molten metal, one burner BIGm 2-6 and two burners BIGm 2-12 are directed to the charge.

EFFECT: high furnace capacity, reduction of heat losses and melting loss and possible environmentally safe remelting of aluminium scraps.

7 cl, 5 dwg

Holding furnace // 2465528

FIELD: metallurgy.

SUBSTANCE: furnace includes at least one bath with side walls and bottom for arrangement of metal in it, and inductor of electromagnetic mixer, which contains magnetic conductor and at least two-phase winding and installed in the area of bath for application of electromagnetic field to the metal contained in the bath. Inductor winding consists of coils the active conductors of which are located relative to each other at the distance equal to Δx=lx/(N-1), where lx - length of the largest side of rectangular bath in which molten metal is contained, N - number of coils, which is determined as the number rounded to the nearest even integer of ratio lx/h.

EFFECT: invention allows obtaining different structure of convective flows of molten metal depending on connection of coils located around magnetic conductor and providing effective mixing of molten metal with equalisation of its temperature and chemical composition.

7 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: furnace consists of case made with refractory external side, front and back end walls, of storage bath and of inclined platform restricted with sole and walls, of roof, of tap hole, of gas duct and of welded frame whereon everything is arranged. Walls of the furnace are externally heat insulated with four layers of sheet asbestos cardboard. The inclined platform and the storage bath are laid out of sole blocks MLS-62 on two layers of asbestos cardboard and on a pad out of dry high-silica sand which facilitates maintaining heat in the furnace bath preventing its emittance to the frame. Inside the frame of the furnace is lined with three rows of light-weight-bricks and two rows of sheet asbestos cardboard reducing heat emission from the bath via the frame. On top the roof of the furnace has a layer with triple heat-insulating coating, a layer of light-weight bricks and a layer of refractory heat insulating mats on it to additionally save heat in the furnace. In the side wall of the furnace there are arranged three burners; also, two-row eight-mixing and GBG-1.2 burners are directed to the inclined platform, while one burner GBG-1.2 is directed to the sole of the furnace. The furnace consists of the tap hole in the side wall made out of quick removable tap bricks in a box, of lined rotating pan with a lined chute welded to it and rotating at angle of 130° for casting metal into casting equipment positioned in a sector at angle of 130° and of a drive for lifting and lowering a door of a charging hole. The drive consists of an electric engine, of a clutch, of a worm reducer, of two shafts with pulleys, of counter-weights, of cables, of chains and of the door.

EFFECT: simplified design, low losses of heat and ecologically safe scrap re-melting.

7 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: smelting furnace consists of independent sources of heat, of melting crucible with back wall, of refining crucibles, of crystalliser and of overflow baffles successively arranged on frame of cold sole. Cavities formed in the gap between successively installed elements of the furnace are filled with neutral flux on base of calcium fluoride, while upper edges of the cavities are made as faces at angle 30÷60°.

EFFECT: avoiding metal leaks into gaps between elements of furnace and increasing resistance of sole due to improved conditions of copper crucibles cooling.

3 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: reverberating furnace consists of case formed with refractory external side, front and back end walls, of storage bath and tilted platform restricted with hearth and walls, of discharge notch, of turning-rotary chute, of gas duct and of welded frame poured with concrete with filler of chamotte chips and having two heat insulating layers out of light-weight brick under bottom and three heat insulating layers out of light-weight brick under tilted platform. In side walls there two loading and two slag windows. Devices for doors lifting and lowering facilitate reliable pressure tightness forming a L-shaped lock. Two rows of gas injection burners of medium pressure are installed in the furnace; also, the lower row of the burners is directed into charge, while the upper one is directed onto the bath. The furnace can operate on natural or forced draught with system of powder-gas cleaning. The turn-rotary chute consists of three connected telescopic sections arranged on a carriage and rotating in the process of liquid metal casting, and of a revolving cup with a lip. The revolving cup is mounted on a channel coaxially to the rotating chute and has a metal case with refractory and heat insulated layer under it. From beneath to the metal case of the revolving cup there is welded a shaft resting on a support ball and facilitating turn of the revolving cup at angle of 120° for successive casting of melt metal into casting equipment installed in a sector at angle of 120°.

EFFECT: re-melting scrap, non-graded from foreign inclusions, and reduced burn-off and heat losses in furnace.

8 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: in addition, furnace contains the wall installed above the melt and made from metal and alloy similar to that molten in the furnace, and mechanism of its movement, which controls the distance between the melt and wall in order to provide the formation of liquid metal layer on the wall surface without its being overheated, at which liquid metal will start flowing from the wall to the melt.

EFFECT: invention allows cardinal decrease of radiant heat losses from the melt surface owing to the installation of the wall above the bath surface; at that, physical properties of the wall change their characteristics when the melt appears, thus creating the conditions of equilibrium radiant heat exchange between the wall and the melt surface.

1 dwg

FIELD: metallurgy.

SUBSTANCE: method involves electrochemical and photochemical synthesis of active oxidisers and complexing agents in leaching solution with the production of anolyte and catholyte. Then mineral mass containing molybdenum is successively treated by them thus providing for the transition of molybdenum into liquid phase from which it can be removed by extraction or sorption.

EFFECT: improved efficiency of process due to the reduction of expenditures on reagents and electric power.

2 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: method includes magnetic-gravitational treatment of red mud. The starting red mud first undergoes dispergation in the presence of sodium hexametaphosphate in a rotary-pulsation apparatus, followed by low-gradient wet magnetic separation in a field with strength of 0.1-0.15 T to obtain a magnetite and a bulk concentrate, subjecting the bulk concentrate to high-gradient magnetic separation in two steps in a field with a strength of not less than 1.2 T to extract magnetic and nonmagnetic fractions, subjecting the magnetic fraction to gravitational concentration on a concentration table to obtain a hematite concentrate and tailings, combining the nonmagnetic fraction with the tailings from gravitational concentration and performing two-step selective flocculation in the presence of a flocculant to separate a component which primarily consists of aluminium and silicon oxides from an iron-containing product, which is concentrated by high-gradient magnetic separation with field strength of 0.5-0.7 T to obtain an additional iron-containing product, which is combined with the hematite concentrate to obtain an iron-containing concentrate, and residual aluminosilicates which are combined with the component primarily consisting of aluminium and silicon oxides to obtain an aluminosilicate product.

EFFECT: high degree of extraction of iron into an iron-containing product and obtaining an aluminosilicate product with high iron content.

5 cl

FIELD: chemistry.

SUBSTANCE: solid copper-vanadium wastes are leached with water to obtain copper-vanadium pulp, to which is added calcium hypochloride or clarified pulp from gas treatment facilities from titanium-magnesium production with concentration of active chlorine equal to 15-90 g/dm3, with ratio of calcium hypochlorite to the copper-vanadium pulp of (1.5-2.0):1. The pulp is held while stirring for 2-5 hours. Hydrochloric acid is added while stirring until achieving solution pH of 2.0-3.0. The suspension is filtered and the copper (II) solution is fed into a cementing apparatus. The precipitate in the form of a mixture of a reducing agent and copper powder is separated into copper powder and a reducing agent. The copper powder is washed, filtered and dried and iron impurities are removed by magnetic separation. After decantation, the reducing agent is returned to the cementing step.

EFFECT: high copper extraction and improved processing properties of the obtained copper powder.

10 cl, 3 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to extraction of metals from flow rich in hydrocarbons and carbon residues with the help of treatment section. Proposed method comprises feeding of said flow to extraction by its mixing with appropriate hydrophilising agent to kill hydrophobic properties of said flow. Mix of said flow and said agent are fed so separation of liquid phase containing major portion of hydrophilising agent and hydrocarbons precipitated from solid phase. Separated solid phase is dried at 350°C to remove medium-light hydrocarbon components. Separated solid phase, preferably dried, is fed for leaching by alkaline solution in the presence of air and/or oxygen, possibly, in the presence of emulsifier or its precursor. Then, leached mix is fed for separation to remove solid residue from leach liquor.

EFFECT: higher yield of valuable metals and hydrocarbons.

13 cl, 3 dwg, 1 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: method includes oxidising roasting, percolation leaching of the roasted product with aqueous solution of an oxidising agent or mixtures of oxidising agents to obtain a rhenium-containing solution and an insoluble residue, sorption of rhenium from the rhenium-containing solution in a separate apparatus, drying the insoluble residue, mixing with fluxing agents and fusion on a metal collector. Percolation leaching is carried out at redox potential values of 900-1100 mV and temperature of 50-90°C, with simultaneous sorption of rhenium, followed by desorption and separation of rhenium compounds or rhenium metal from the strippant. The fluxing agents used to fuse the insoluble residue are fluorspar, sodium carbonate and sodium nitrate. Fusion is carried out at temperature of 1200-1800°C on a metal collector in several steps, while discharging the formed slag after each step and fusing the next portion of the mixture on the collector from the previous fusion with separation of the alloy of platinum metals with the collector.

EFFECT: high degree of extraction of rhenium, low reactant consumption, labour input, faster processing of the material, considerable reduction of the volume of solutions which require recycling.

8 cl, 1 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: device contains successively installed a feed hopper, an open hearth furnace, an afterburning chamber, a recuperator of combustion air heating, a heat recovery unit, a smoke exhauster and a smokestack, means for fuel supply. The furnace is provided with a bag filter for purification of flue gases from dust and a catalytic apparatus for purification of flue gases from carbon oxides and nitrogen oxides. The catalytic apparatus consists of a vertical case with a conic bottom, inside which from top to bottom placed are: a vertical heat-exchanger, a liquid distributer, an absorption section, a desorption-cooling section, an aspiration hood with a fan and a Venturi tube. A method includes preparation of a charge in the form of a mixture of wastes with flux, loading of the charge and its melting in a bath of the open hearth furnace at a temperature of 1450-1500°C. Performed are: discharge of released combustible components into the afterburning chamber with heat recovery of flue gases, purification of flue gases from dust in the bag filter, purification of smoke gases from carbon oxides and nitrogen oxides is performed in the catalytic apparatus.

EFFECT: method improvement.

2 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: group of inventions relates to utilisation of solid mercury-containing wastes, in particular fluorescent lamps. A method of utilisation of solid mercury-containing wastes includes an oxidation stage with further stand, processing a wastes mixture with a demercurised solution of an alkali metal polysulfide with further stand of the reaction mixture. Wastes are divided into two parts. One part, which contains crushed wastes, is processed with an oxidant, and then with a demercurised iodine-alcohol solution or a sodium sulfide solution. The second part of wastes in the form of aeromixture is passed through a nanoporous carbon sorbent NCMS-J. A device for utilisation of mercury-containing wastes contains a unit of loading and crushing, a purification unit and an aeromixture unit. The purification unit is made in the form of a truncated cone, connected by means of a flange to a cylindrical reservoir with a perforated screw, provided with a valve for the solution discharge, and an upper part of the perforated screw is provided with an unloading flange for discharge into a storage hopper. The aeromixture unit is made in the form of a column type adsorber with the nanoporous carbon sorbent NCMS-J.

EFFECT: ensuring reduction of mercury vapour concentration in air and water extract to TLV level, neutralisation of solid wastes of compact fluorescent lamps to IV class of hazard.

7 cl, 1 dwg, 4 ex

FIELD: metallurgy.

SUBSTANCE: furnace includes a housing formed with refractory external side, front and rear end walls, two baths restricted with bottoms, an arch and walls, two drain tap holes, a gas duct and a pedestal, on which all parts are arranged. In the furnace there is external heat insulation of walls, which consists of asbestos tailings and a double layer of asbestos boards. The furnace pedestal has two layers made of light-weight brick with the double layer of asbestos boards between them, a quartz sand layer from below and from above, which is mixed with asbestos tailings, and three layers of asbestos boards on the top, on which bottom block are laid. A casting shoe includes a housing formed with refractory external side, front and rear end walls, a bath, restricted with a bottom, an arch and walls, and drain tap holes. The casting shoe pedestal has two layers made of light-weight brick and separated with an asbestos board layer, and a lower asbestos board layer. The casting shoe has two tap holes made in quick-changeable tap-hole bricks in a box. The furnace has two turning chutes with a turning bowl, which are installed on brackets welded to the casting shoe box, which are turned during liquid metal pouring process for subsequent pouring of molten metal in the furnace to pouring equipment located in a maintenance sector with an angle of 143°. Five injection burners are installed in the furnace and the casting shoe. The furnace operates at natural and artificial draft with a dust and gas cleaning system.

EFFECT: improving efficiency and decreasing heat losses.

5 cl, 12 dwg

FIELD: metallurgy.

SUBSTANCE: electronic waste is crushed on a hammer crusher; crushed copper is added, and then, it is fused in presence of flux during 45-60 minutes at the temperature of 1320-1350°C with air blowdown at its flow rate of 3-4.5 l/h and the obtained slag containing at least 2.6 wt % of precious metals is separated from slag.

EFFECT: effective electronic waste processing with increase of content of precious metals in an alloy.

1 ex

FIELD: chemistry.

SUBSTANCE: mixture, consisting of sulphur powder, granules of floatation sulphur pyrite of grade KSF-4 in mixture with broken stone with fraction 20-70 mm or brick crumbs, which are simultaneously agent binding mercury in ionised and neutral forms, taken in ratio 1:9 by weight, and water. After that, mixture is homogenised at rotation rate 20 rev/min, argon is supplied at rate 5.5-6.5 m3/h and then mercury-containing wastes are charged in amount which is at least 50 times less than weight of sulphur powder. Grinding of wastes is carried out to complete binding of metal mercury into water-insoluble compound HgS.

EFFECT: simplification of technology, increase of ecological safety of the process.

2 tbl

FIELD: non-iron metallurgy, in particular reprocessing of aluminum waste.

SUBSTANCE: claimed method includes junk charge into premelted flux at ratio of 1:(5-10); heating up to melt temperature; smelting under flux layer, and separation of metal from flux. Equimolar mixture of sodium chloride and potassium chloride with addition of 2.9-52.6 % (in respect to total flux weight) magnesium fluoride is used as flux, and in melting process flux layer with thickness of 4.5-20 cm is maintained. Method affords the ability to conserve original composition and eliminate additional burdening with magnesium.

EFFECT: decreased burn-off loss, especially for magnesium, metal of improved quality.

4 cl, 3 tbl, 5 ex

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