Reverberatory furnace for remelting of scarp-aluminium

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

 

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, bratvany 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. I think the oven, taken as a prototype, has the following disadvantages:

1. Pécs is no camera 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 flue, according to the present invention, entered welded frame filled with concrete filler: fireclay and asbestos crumbs, cumulative bath and inclined platform made of corundum blocks the COP laid on three layers of assocarta and lightweight brick SHL-1,0. Concrete filler: fireclay and asbestos crumbs, three layers of assocarta and lightweight bricks 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 corundum blocks the COP THAT 14-8-556-87, which have high resistance and durability (service life for practical data 8-9 years).

In addition, the reflective furnace for melting aluminum scrap is in one of the side walls of the two injection wasespecially burner medium pressure, angled on sloping ground, the other side wall of one injection wasespecially burner directed at an angle onto the sloping ground, and another 17-mixing, aimed at the furnace hearth furnace. 17-mixing burner is in the center of the five mixers with nozzles that allow you to get a torch length of 2.7 meters, other mixers are used without the tips and have a torch length of 1.5-1.6 m, wasespecially burners are in the top row, four mixer made with ribs at their ends inside the Central channel, giving a combustion gas-air mixture long torch for 2.2-2.3 meters, mixers, located in the bottom row allow you to get a torch length of 1.2 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 17-mixing burners. thermal capacity of the burner is 6240 KW, which makes high-performance furnace, allowing rapid melting conditions.

When this reflective furnace for melting aluminum scrap has a spare and working tapped in the side wall to release the molten metal in the quick-change tap the bricks, and each summer the hydrated brick is placed in a metal box gunning brick, which is welded to the frame, the latter is attached to the duct furnace, in addition, the furnace has a refractory-lined rotary Cup welded to it lined with swivel spout, which can be rotated in the process of pouring liquid metal and consistently pour weld metal in the furnace to a pouring equipment located in the service sector with an angle of 135°.

Moreover, to the frame of the furnace welded steel box with insulation between them and each wall (except front - insertable), consisting of asbestos crumbs, double layer of refractory mats, dual layer 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 double layer of refractory insulating mats. This further reduces heat loss from the oven.

Next, the furnace has a drive lifting and lowering of the working valve of the furnace, consisting of a motor, clutch, worm gearbox, drum, pulley, rope, chains, counterweights, blocks and valves with triple insulating layer asbestos lined with lightweight single refractory brick, which slides on zapatenovannuyu in the inclined front wall metal guides that ensure the Ute when closing the flap of the working window of the furnace a sufficient tightness, that helps to reduce smoke. Flap slag box furnace has a frame, lined with lightweight single brick, the Pro-frame 35 mm, and the frame is fixed in the console, which is rotated around an axis, closing the slag box, forming a reliable "l-shaped castle, which helps reduce smoke and heat from the oven.

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 systematically injection burner, blower, and on top of the camera afterburners installed economizer.

Finally, reverberatory furnace is supplied with installation of dust removal to achieve environmentally friendly process, and installation of dust removal is square in cross section the shape of the hull, in which two rotating grille and fourteen of fabric filters.

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

The presence of the sloping site allows in a furnace and melted down graded from foreign inclusions scrap because of alterations (iron and steel rings, liners, sleeves, rods, tappets, valves, etc.) do not fall into the molten metal.

Figure 1. Type of furnace in the plan.

On Fig. A longitudinal section of the furnace.

Figure 3. View B of the furnace.

Figure 4. Type of furnace side of the working window.

Figure 5. 17 mixing burner.

Figure 6. The section G-G 17 mixing burners.

7. Double row wasespecially burner.

On Fig. Installation of the tap brick niche in the oven.

Figure 9. Installation of dust removal.

Figure 10. Bake with the filling equipment and installation of dust removal.

The proposed furnace contains mounted on the frame 1 of the furnace casing formed 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 of corundum blocks POS. 6 COP THAT 14-8-556-87 laid on three layers of assocarta 7 and lightweight brick SHL-1.0 POS. 8 (2). The concrete filled in the frame 1 with filler: fireclay and asbestos crumbs, three layers of assocarta 7 and lightweight brick 8 under the furnace hearth 4 and under the inclined platform 5 can reduce the loss 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 corundum blocks the COP THAT 14-8-556-87, which have high resistance and durability (service life for practical data 8-9 years). The use of corundum blocks CA (large - length 1000 mm, width 400 mm, depth 300 mm, small - length 500 mm, width 400 mm, 300 mm thick instead of ordinary the data 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 the refractory blocks KC 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 solution consisting of refractory clay (21%), refractory powder (75%), liquid glass (3%) and foscan (alumbramiento mixture, 1%).

The thickness of seams 1-2 mm, thermocompensation seams not uploaded.

On the metal frame 1 of the furnace is lined with four walls, at 4, inclined platform 5. The frame of the furnace welded welded from I-beams No. 20 (9), channels No. 14 (10), fill the bottom of the concrete grade in40 filled with fireclay and asbestos dust. Excess concrete in40 filled with fireclay and asbestos crumbs off the line with the surface of the tee No. 20. The horizontal portion of the bottom 4 consists of five a number of is in corundum blocks KS three pieces in each row, inclined part of the bottom 4 has four rows of corundum blocks KS three pieces in each row, placed on a die. The size of the bottom 3×2.4 meters. The sloping site 5 consists of seven rows of bottom blocks of the COP laid on edge. The size of the inclined platform 3×2.1 meters. 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. In the side wall includes working years and replacement, made in the tap the bricks. Each of the tap brick is placed in a metal box pulmonary brick and masonry side wall is placed in a niche, with frame 12 are welded to the duct lung brick and mounted on a steel box furnace 11 four pins 13 and four nuts 14. Each years shuts up lance 15, which is screwed into the hole and come unscrewed in the two nuts 16 which are welded to the bracket 17. More about tap the bricks will be described below.

When this reflective furnace for melting aluminum scrap has a rotary lined chute 18, which is rotatable in the process of pouring liquid metal and is in the design of lined rotary Cup 19, which allows us to consistently pour weld metal in the furnace to a pouring equipment located in the service sector with an angle of 135° figure 1. PE is ednea wall 2 of the furnace is lined with a half brick, the remaining two.

To the frame 1 of the furnace welded steel box 11 of the furnace, with insulation between them and each wall (except the front 2)consisting of asbestos crumbs, refractory mats, dual layer sheet assocarta. This design significantly reduces heat loss to the environment.

Mounting steel box furnace 11 to the frame 1 of the furnace is a vertical channel No. 16 (20) figure 3.

To prevent spreading of the masonry of the furnace of the vertical channels have a bunch of the horizontal channel No. 16 (21) 1, 3.

Working 22 and slag 23 Windows have arches 24 and 25, respectively, lined templates from fireclay end of the wedge SHA-1 # 22 and # 23 2, 4. Next, the furnace has a drive lifting and lowering of the valve operating window of the furnace, consisting of an electric motor 26, the clutch 27, the worm gear 28, the drum 29, the pulley 30, wire 31, chain 32, counterweight 33, block 34 and flap with triple insulating layer of asbestos 35, lined with lightweight single refractory brick 36, which slides on the inclined front wall 2. It on the sides zapateroone metal guide channels (not shown)that provide at closing a valve of the working window of the furnace a sufficient tightness that contributes to the reduction of intoxication. Flap slag box furnace has a frame 37, mounted in the console 3, which is rotated around the axis 39, closing and opening the slag box 23. It is lined with lightweight single refractory brick, Pro-frame 35 mm and forming when closed a reliable "l-shaped castle, which helps reduce smoke and heat from the furnace 1. Opening and closing the valve manually.

In addition, the reflective furnace for melting aluminum scrap has in one side wall of the two injection wasespecially burner medium pressure 40, oriented at an angle to the inclined area 5, in the other side wall of one injection wasespecially burner 41, directed at an angle to the inclined pad 5, and another 17-mixing 42 towards the furnace hearth furnace 4. 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 17-mixing burner 42. thermal capacity 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.

17-mixing burner 42 is in the center of the five mixers with nozzles 43 and 44, which allow you get the ü torch length of 2.7 meters. The rest of the mixer 45 is used without the tips and have a torch length of 1.5-1.6 m (burner was investigated in the laboratory LLC Penplas" at the research bench) 5, 6. The burner has a burner tunnel 46 for stable combustion of the flare casing 47 for gaskets between mixers refractory ramming mass 48. Gas enters the distribution box 49 for fitting 50.

Nominal working pressure burners 0.08 MPa. When the furnace in four aperture stacked four injection burners and overlap blocks the COP THAT 14-8-556-87. 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.

Injection burners, with each eight mixers 40, 41, aimed at the furnace hearth are in the left lane four mixer made with ribs at their ends inside the Central channel, giving a combustion gas-air mixture long torch (received 2.2 to 2.3 meters in the laboratory LLC Penplas" at the research bench) 7. Faucets located in the right row, are: inner diameter 43 mm, external 65 mm, smooth inner surface, and four nozzle with a diameter of 1.6 mm. During combustion of the gas mixture in such mixers is formed torch length of 1.2 meters. When installing burners left number of taps should be at the top, right bottom, and before installing the furnace burner calcined outside the furnace, and when installing only close up the gap formed between the walls of the opening and the burner. Burners are directed to the furnace hearth and overlap blocks KS. This arrangement of the burners allows for high speed melting, burning decrease.

A large body 51 made according to the template (the wheel) of the wedge end SO No. 22, No. 23 and has a coating 52 having the following composition:

- asbestos crumb - 90%;

- liquid glass - 5%;

- fire clay - 5%;

is water.

Top coating with a layer of refractory insulating mats 53, which further reduces the heat loss from the furnace. Pyatov beams are welded from channel No. 24.

A reverberatory furnace for melting aluminum scrap equipped with afterburning chamber 54. The afterburning chamber 54 lined with refractory brick and has thermal insulation 55, consisting of asbestos crumbs, refractory mats, dual layer sheet assocarta. This design significantly reduces heat loss to the environment. In the afterburning chamber 54 has a double row systematically burner 56. Additionally, the necessary air for combustion is supplied air is uvkai 57, 2, 3. To clean the afterburning chamber 54 from dust, soot has a window 58 closed by a valve 59. In the upper part of the mixing chamber has a gate 60, regulating draught in the furnace. Over the afterburning chamber 54 is placed economizer 61, which heats the water used for technological needs.

Some clarification on the design of the tap of the brick shown on Fig. Inaccurate brick 62 is placed in a metal box 63 gunning brick 62, is fixed therein due to the presence of the groove made along the perimeter edge metal boxes 63 gunning brick 62 welded to the frame 12. To the frame 12 and the metal box 63 gunning brick 62 welded two handles 64, through which the refiners do metal and alloys set in a niche in the wall 65 of the tap brick 62 placed in a metal box 63 gunning brick 62, while the stud 13 is fixed in the grooves of the frame 12. Anchoring is performed four nuts 14.

When replacing worn-out gunning brick 62 four Unscrew the ring nut 14, a metal box 63 gunning brick 62 together with fixed inside him gunning brick 62 and frame 12 are removed from the niche, put in a new one prepared gunning brick 62 located in a metal box 63 gunning brick 62 welded to the frame 12 in a niche in the oven and screw the four screws 14 on four studs 13. Essentially mark the mounting, that the supply of natural gas to the four burners of the furnace and the burner chamber for afterburning is produced by the pipeline 66.

Flue gas cleaning from dust and harmful substances occurs in the installation of gas cleaning, developed by the author and shown in Fig.9, which has a wide range purify harmful substances in the flue gases. The dust removal is a prefab steel square section body 67, the bottom of which has a bottom swivel boot grille with holes 68. In the middle part of the steel casing 67 has a top swivel boot grille 69 with holes. The rotation of the grating around the axes by using handles attached to the axles. Above the lower swivel boot grating 68 is lower boot outlet 70. Above the upper swivel boot lattice 69 located on the top of the boot nozzle 71. Inside the upper part of the steel casing 67 posted by bag filters of 14 pieces, which trap dust particles from flue gases.

In the upper part of the steel housing 67 mounted on four brackets 72 maintenance platform 73, which is based on four pillars 74. On the platform 73 fixed frame 75 on which is mounted a blower 76 with an electric motor 77. The spent adsorbent and the dust collected in onuses part 78 steel housing 67. The cleaned gases are supplied in the installation of dust removal through pipe 79. Turning the knob 80, the spent adsorbent is fed through the lower neck steel body 67 in a container (not shown). For maintenance of bag filters operator has a chamber 81 with a cover 82. The cleaned flue gases are supplied through the pipe 83 into the blower 76. The installation of gas cleaning is performed with ladders.

Main technical characteristics of the installation of dust removal:

- performance on clean gas12800 m3/h;
- the surface area of the filtering16.8 m2;
- the number of bag filters14 pcs.;
- the thickness of the layer of adsorbent0.3 to 0.35 m;
the degree of purification by hydrogen fluoride70%;
the degree of purification of copper oxide86%;
- purification of carbon monoxide94%;
the degree of purification of nitric oxide86%;
the degree of purification on alumina81%;
the degree of purification in the dust92%;
the temperature of the purified gasfrom 20 to 100°C;
the temperature of the outer surface installationfrom 40 to 55°C;
- the sound level of no more than80 DBA;
energy costs for cleaning6 kW/h

Before installing dust removal installed the mixing chamber 84 in which the gate 85 is designed to regulate the flow of flue gases in the installation of gas cleaning, and the gate 86 for mixing flue gas with the air of the shop. For discharge of flue gases in the installation of gas cleaning is the exhauster DN-10 POS, before entering through the pipe 88 to the pipe 89 is installed gate 90, and the metal box 91 gate 92.

The oven operates on natural draft in the following way. The smelter metal and alloys opens the gates 60 and 90, the dampers 85 and 92 are closed, while the draught of the furnace should be 2-20 daPa. The gas is fed through the pipeline 66, includes burner and made red-hot oven for technological schedule calcination depending on the type conducted REM the NTA. After calcination enables the lifting mechanism of the valve of the working window 22 and calcined in a furnace inclined pad 5 through the working window 22 is loaded by the loader intact aluminum scrap. The flame three gas injection burners 40, 41 heats the scrap prior to melting. The metal melts and flows down the inclined platform 5 at 4 furnace. The accumulation of molten metal in the furnace hearth furnace 4 is loaded into the slag box 23 scrap that is melted by the flame of the burner 42. The hot flue gases hit in the rear wall 3 of the furnace, then climb up and enter into the afterburning chamber 54, in which burnt through the economizer 61, heat water for technological needs and the pipe 89 is removed to the atmosphere via a flue 88. In the process, heat is accumulated in a large arch 51, whence it is reflected on the metal. The layer of coating 52, double layer of refractory insulating mats 53 big arch 51, insulated walls, hearth 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 with a refractory filler and asbestos crumb 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 OST who are all inclusions 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 flux of liquid metal, thorough mixing of the metal in the bath and confirmation by laboratory spectral analysis marks obtained alloy, Zalewski metal opens lance 15 tapped 93 and produces the casting of liquid metal in the mold filling carousel 94. After casting out of the furnace, molten metal, smelter metal and opens the damper slag window 23 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 90, and the gates 85, 86, 92 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 ladders in the installation of gas cleaning and produced by its inclusion, it also enables the exhaust fan 87. The products of combustion, after passing the mixing chamber 84, diluted in air of the shop, then are cleaned from dust and harmful compounds in the environment dust removal and forced by fan 87 and blower 76 metal conduit 91 through the pipe 88. The principle of operation of gas cleaning consists of the following: flue gases pass through the layer of adsorbent on the bottom 68 and the upper 69 bootable arrays, forming a "fluidized bed", resulting in harmful substances in the flue gases adsorbed lime pushonkoj, activated carbon, silicagel, birch charcoal. After purification of flue gases from harmful substances they are cleaned from dust in 14-bag filters, located in the upper part of the steel casing 67. Turns the handle 80 and the spent adsorbent is discharged through the lower neck steel body 67 in a metal container and vvozitsya blade.

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, an inclined platform, vault, drain tapped flue, characterized in that the furnace body is placed on the welded frame filled with concrete filling, with cumulative bath and inclined platform made of corundum blocks the COP laid on three layers of assocarta and lightweight brick SHL-1,0, to the frame of the furnace welded steel box with insulation between them and each wall, except the front insertable consisting of asbestos crumbs, double layer of refractory is mats double layer sheet assocarta, the furnace has in one side wall of the two injection wasespecially burner medium pressure directed at an angle to the inclined platform, in the other side wall of one injection wasespecially burner directed at an angle to the inclined platform, and another 17-mixing, aimed at the furnace hearth furnace, lined with refractory brick chamber for afterburning, which is equipped with gas systematically injection burner, blower, and on top of the camera afterburners installed economizer.

2. Furnace according to claim 1, characterized in that it has the drive of the lifting and lowering of the valve operating window of the furnace, consisting of a motor, clutch, worm gearbox, drum, pulley, rope, chains, counterweights, blocks and valves with triple insulating layer asbestos lined with lightweight single refractory brick, which slides on zapatenovannuyu in the inclined front wall metal guides breakthrough when closing the flap of the working window of the furnace a sufficient tightness.

3. Furnace according to claim 1, characterized in that the damper slag box furnace has a frame, lined with lightweight single brick, the Pro-frame 35 mm, and the frame is fixed in the console, which is rotated around the axis with the formation of the closing of toxins is the first window the l-shaped lock.

4. Furnace according to claim 1, characterized in that it has a spare and working tapped in the side wall to release the molten metal in the quick-change tap the bricks, with each tap the bricks placed in a metal box pulmonary brick welded to the frame, fixed to the duct furnace, refractory-lined rotary bowl with welded thereto lined swivel chute made with the possibility of rotation in the process of pouring liquid metal and serial casting weld metal in the furnace to a pouring equipment located in the service sector with an angle of 135°.

5. Furnace according to claim 1, characterized in that the roof of the furnace has a refractory heat-insulating coating and top it stacked double layer of refractory insulating mats.

6. Furnace according to claim 1, characterized in that it is provided with installation of dust removal to achieve environmentally friendly process, having a square sectional shape of the body in which two rotating grille and fourteen of fabric filters.

7. Furnace according to claim 1, characterized in that the 17-mixing burner is in the center of the five mixers with nozzles for receiving a torch length of 2.7 m, the rest of the mixers without nozzles have a torch length of 1.5-1.6 m, and wasespecially burners are in the top row, four mixer made with ribs on them is anzah inside the Central channel for receiving the combustion gas-air mixture long torch for 2.2-2.3 m, and mixers in the bottom row to obtain torch length 1.2 m



 

Same patents:

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2 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: proposed furnace comprises lining, interconnected on-piece heat-insulating blocks and heat blocks, and furnace outer metallic shell. Furnace roof is composed of one row of central one-piece heat-insulating blocks, two rows of bearing one-piece heat-insulating blocks while furnace hearth is composed of two rows of one-piece heat-insulating blocks and one row of heat blocks. All parts of lining are composed of one-piece blocks from high-strength refractory nonconducting phosphate concretes used as structural load bearing elements.

EFFECT: high-strength refractory lining with low consumption of electric power, decreased overall dimensions.

5 dwg

FIELD: metallurgy.

SUBSTANCE: proposed furnace comprises lining, interconnected on-piece heat-insulating blocks and heat blocks, and furnace outer metallic shell. Furnace roof is composed of one row of central one-piece heat-insulating blocks, two rows of bearing one-piece heat-insulating blocks while furnace hearth is composed of two rows of one-piece heat-insulating blocks and one row of heat blocks. All parts of lining are composed of one-piece blocks from high-strength refractory nonconducting phosphate concretes used as structural load bearing elements.

EFFECT: high-strength refractory lining with low consumption of electric power, decreased overall dimensions.

5 dwg

FIELD: metallurgy.

SUBSTANCE: invention refers to methods of steel making in electric furnaces with consumable electrodes submerged into molten slag at continuous supply of iron-rich pellets to molten slag simultaneously with carbon-containing material, gas through an axial hole in the electrode. Inert gases or mixture of inert and reducing gases are used as gas; separate supply of iron-rich pellets and carbon-containing material in flow of inert gas or mixture of inert and reducing gases is performed through a cone of electrically insulating material with connection pipes, which is installed in axial hole of the electrode above an electrode holder, and melting is performed considering the consumption of carbon-containing material, loss of carbon as a result of electrode oxidation in slag, and supply of carbon to under-electrode zone at melting of pellets in it.

EFFECT: invention allows increasing the stability of end part of the electrode, as well as increasing the heat supply to pellet melting zone under reducing atmosphere conditions.

1 dwg

FIELD: electrical engineering.

SUBSTANCE: one measures electrode voltage and current as well as the phase voltage direct component, with the hot melt bath depth determined in accordance with a mathematical expression. The invention essence consists in usage of the semi-conductor effect of the electrode contacting the hot melt. This effect results in appearance of a direct component in phase voltage which is registered with a special device. The bath depth and the hot melt quantity may be determined by the value of decline of the phase voltage direct component dependence on current.

EFFECT: increase of measurement promptness and accuracy.

3 dwg

FIELD: metallurgy.

SUBSTANCE: seal ring is made from metal alloy wherein first metal is copper and second metal is silver. Note here that said weight ratio of said components makes 97% of copper and 0.05-0.5% of silver. Seal ring every segment has two converging engagement elements to be engaged with the help of complementary converging appliances so that said segments get tightened toward each pother in fitting seal ring in place. Seal ring comprises sealing appliances arranged between seal ring and contact shoe.

EFFECT: good conductivity and mechanical strength at increased temperatures.

5 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

FIELD: metallurgy.

SUBSTANCE: method involves cleaning of scraps by acid treatment with removal of manganese dioxide. Then, deoxidation of cleaned scraps, its hydration, grinding, dehydration at increased temperature is performed so that tantalum hydride powder is agglomerated and tantalum capacitor powder is obtained. At that, acid treatment is performed at room temperature using the solution containing 100-300 g/l of sulphuric acid and 110-300 g/l of hydrogen dioxide, or the solution containing 30-150 g/l of hydrochloric acid and 75-225 g/l of hydrogen dioxide. Scrap hydration is performed by treatment using the solution of hydrofluoric acid with concentration of 1-5%. The obtained capacitor tantalum powder provides specific charge of up to 7300 mcC/g, breakdown voltage of more than 200 V and leakage current of 0.0001-0.0003 mcA/mcC when being used in anodes of tantalum oxide-semiconductor capacitors.

EFFECT: reduction of energy intensity and improvement of environmental friendliness of the process at its simultaneous simplification.

3 cl, 6 ex

FIELD: process engineering.

SUBSTANCE: invention relates to flotation of man-made stock. Method of flotation of sulfide ores of nonferrous and noble metals comprises conditioning crushed ore with dithiophosphate solution or other sulfhydric collectors in lime medium and flotation. Note here that for reduction in floatability of pyrite and increase in extraction of metal up to 10 wt % of thiourea ((NH2)2CO) or its derivatives are preliminary introduced in the solution of dithiophosphate as a modifying agent. Then, pulp from ore is conditioned, first, with modified dithiophosphate at pH 8.5-9.0 for 3-5 minutes and, then, with, xanthate at pH over 9.0 for 1.0 minute. Then flotation of sulphides of nonferrous metals and mineral forms of noble metals at input of modified of dithiophosphate and xanthate varying from 1:3 to 3:1, respectively.

EFFECT: reduced floatability of pyrite and other iron sulphides, increased floatability of nonferrous metal minerals, native gold particles and its exposed concretions with sulphides.

3 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to regeneration of secondary metal-bearing raw material, including to electrochemical processing of metal wastes of tungsten-copper alloys containing 7-50% Cu. The above method involves anodic oxidation of wastes in 10-15% of ammonia solution under action of direct current. At that, the oxidation process is performed with addition to the solution of 0.1-0.5 M NaOH or 0.1-0.5 M KOH at current density of 1000-3000 A/m2.

EFFECT: improvement of metal extraction at minimum electric power consumption and effective separation of tungsten and copper.

2 dwg, 1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: red sludge is melted in a fuel-oxygen skull melting unit, iron is reduced with carbon-bearing reducing agent, and the produced metal and slag are output separately. In addition, sludge is heated and dried in a drying device till humidity is 6-10% with the heat of exhaust gases of the melting unit with the temperature of 1750-1850°C with addition to wet sludge of 3-6% of the weight of lime production wastes. Dried sludge is loaded by means of a sealed loading device from the drying device onto molten slag heated to 1640-1680°C, at the speed of 1.2-1.4 tons per 1 m2 of the heel of molten slag per hour. Reduction of iron from molten charge is performed by means of carbon-bearing materials loaded onto the slag in the quantity providing the content of iron oxides in the final reduced slag within 3-5%. Separate drainage of melting products is performed continuously or periodically, thus maintaining vibrations of the molten metal level in the melting unit of not more than by 200-300 mm by changing the drain speed and the quantity of melting products.

EFFECT: creation of high-efficiency single-stage processing process of red sludges and simplification of the processing process.

8 cl, 3 ex, 2 tbl

FIELD: metallurgy.

SUBSTANCE: proposed method comprises extracting essential part of rhenium from catalyst by direct contact between catalyst and one or more polar non-acid, in fact, anhydrous organic solvents. In contact with solvent, solution is formed containing said polar non-acid organic solvent and extracted rhenium. Note here that said polar non-acid organic solvent with molar structure that contains one or more atoms of oxygen, nitrogen and/or halogen.

EFFECT: simplified and cheaper process, selectivity of rhenium extraction.

23 cl, 2 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: method of processing domestic and industrial wastes involves loading the wastes with preliminary separation by separating glass, concrete, ceramics and metal; drying with partial pyrolysis of organic matter in a shaft furnace; agitation of the processed wastes with further pyrolysis thereof. Temperature of said process is reduced to 500-850°C as a result of the action of reducing plasma-chemical components obtained by steam-oxygen conversion of methane with increase in consumption of steam fed by the counter-current of the moving wastes. Recycled process gas coming from the shaft furnace is cleaned in scrubbers and is divided into fuel gas which is fed into both the methane converter and the exhaust-heat boiler when producing reducing gas with partial addition of natural gas and oxygen. Exhaust gases from the exhaust-heat boiler are cleaned in an adsorber via contact with fine-grained lime. Also, a portion of the formed reducing gases is consumed in the bottom part of the reactor during an instantaneous thermal shock which results from burning soot-dust particles coming from a hot gas cyclone with deposition thereon of dioxins, furans and other harmful components in an atmosphere of oxygen, wherein the formed reducing gases can also be fed as synthesis gas for production of methanol, dimethyl ether, engine fuel and other products.

EFFECT: invention reduces power consumption of the method.

1 dwg

FIELD: metallurgy.

SUBSTANCE: method involves solid-phase roasting of wastes mixed with soda to fix arsenic to a water-soluble form of sodium arsenate. Then, water leaching and deposition from arsenic solution is performed. In order to obtained the product from water leaching with low residual arsenic content of 0.7%, solid-phase roasting is performed at 850°C so that a roasted product containing 2.9% of arsenic is obtained. Water leaching of the roasted product is performed with extraction degree of 84%. Deposition from arsenic solution is performed in the form of arsenic sulphide with sodium sulphide at pH=3 with deposition degree of 99.6%, and filtrate with arsenic content of 0.02 g/l for removal of residual amount of arsenic by neutralisation and deposition with iron compounds meets the requirements of sanitary norms.

EFFECT: obtaining low-toxicity commodity product of arsenic sulphide and product of water leaching with low residual content of arsenic.

1 dwg, 1 tbl, 5 ex

FIELD: process engineering.

SUBSTANCE: invention relates to hydrometallurgy, particularly, to mineral stock dressing devices. Proposed plant comprises reactor, control board, HV transformer, and pulse generator with bank of capacitors. Reactor is composed of rectangular cross-section vertical tube to process dry or wet mineral stock. Shelves are arranged inside said reactor hinged at 45-60 degrees to reactor vertical axis. Said shelves double as grounded electrode. HV electrode is mounted outside the reactor, at hole cut in its wall. Note here that shelf bent edge stays opposite HV electrode head to rest, from inside, onto spring-loaded support to allow vibration of shelves by shock wave effects.

EFFECT: higher quality of raw stock.

2 cl, 2 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: extraction of non-ferrous metals is performed in plasma electric arc furnace of alternating current, which has a group of electrodes and contains a molten liquid copper bath coated with liquid slag. The method involves a melting-reducing stage consisting of the following operations: loading of metallurgical wastes onto the surface of liquid molten copper bath, melting of metallurgical wastes in liquid slag at the slag/bath copper boundary, reduction at least of non-ferrous metals to the oxidation degree, which is more than or is equal to zero, and intensive mixing of the liquid molten copper bath by blowing of inert gas, preferably nitrogen and (or) argon. Mixing is performed so that it can be possible to avoid the formation of a crust, expedite the reduction reaction and cause the transition of copper-soluble non-ferrous metals to the molten copper.

EFFECT: increasing the extraction of non-ferrous metals from wastes.

16 cl, 9 tbl, 2 ex

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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