Tandem reflecting furnace with casting shoe for remelting of aluminium scrap

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

 

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 (Source information Are, Openelec, Art "Technology secondary non-ferrous metals and alloys", p.22-23), comprising a housing formed of brick masonry exterior walls, as stated in the furnace, two baths, limited bogies and walls, two vault, drain and tapped the flue.

The disadvantages of this furnace are:

1. The second melting chamber acts as a mixer (kopilnika), which ultimately reduces the productivity of the furnace.

2. Oven has insufficient thermal insulation of walls, roof reduces 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 oven for lining and one uses basic refractory brick, and not bottom blocks, which greatly enhance the service life of the furnace. 5. From the description of the furnace, it does not ensure maintenance of the forced mode of fusion. Due to the above disadvantages of the furnace can not provide a technical solution for the ACI. Known analog - triple-reflective furnace for melting aluminum scrap (Source information Mesclar "Furnace, secondary metallurgy, ed. "Metallurgy", 1987, p.35-37), comprising a housing formed of brick masonry exterior walls, as stated in the furnace, two baths, limited bogies and walls, two vault, drain and tapped the flue.

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

1. The second melting chamber acts as a mixer (kopilnika), which ultimately reduces the productivity of the furnace.

2. Oven has insufficient thermal insulation of walls, roof reduces 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 oven for lining and one uses basic refractory brick, and not bottom blocks, which greatly enhance the service life of the furnace.

5. From the description of the furnace, it does not ensure maintenance 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 double-bath furnace (Source information Mesclar "Furnace, secondary metallurgy, ed. "Metallurgy", 1987, p.87-89), which is the closest (prototype)containing orpus, educated brick masonry exterior walls, as stated in the furnace, two baths, restricted to pods, ceilings and walls, drain entrances and flues.

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

1. Oven does not have kopilnika.

2. Oven has insufficient thermal insulation of walls, roof reduces 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 oven for lining and one uses basic refractory brick, and not bottom blocks, which greatly enhance the service life of the furnace.

5. From the description of the furnace, it does not ensure maintenance of the forced mode of the heat.

6. In the furnace uses two stationary chute for discharging the molten metal.

Due to the above disadvantages of the furnace can not provide the solution of the technical problem.

The objective of the invention is the creation of high-performance double-bath gas reverberatory type furnace with kopilnika for melting aluminum scrap to reduce the emissions of harmful gases into the atmosphere, to reduce heat loss to the environment, as well as to increase durability and to enter into the rotary kiln chute.

The technical result - developed gas reflective double-bath-type furnace with Kapil the ICOM for melting aluminum scrap is a high-performance, having two swivel chute, long service life, allows to reduce heat loss into the environment due to the special insulation, lead the process of remelting on natural and artificial draught with dust removal system, making it environmentally friendly.

This technical result is achieved due to the fact that in the double-bath furnace for melting aluminum scrap, comprising a housing formed of refractory outer side, front and rear end walls, two baths, restricted to pods, ceilings and walls, drain entrances and flues, according to the present invention, entered the furnace pedestal having two layers made of lightweight brick, with a double layer of assocarta between them, as well as having the bottom layer and the top layer of quartz sand mixed with crushed asbestos crumbs, besides, with the top three layers of assocarta, which are stacked deck blocks OIFP two one.

The insulation pedestal furnace, consisting of two layers of lightweight brick, four layers of assocarta and two layers of quartz sand mixed with crushed asbestos crumbs, allows to keep the temperature of the metal in the bath of the furnace. Hearth blocks mullite povyshennaya platform, placed on three layers of assocarta have high ogneupor.net and resistance and can increase the service life of the furnace. Application of blocks of the platform 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 refractories, to accelerate the construction of the furnace and to reduce the share of manual labor.

It should be noted that in the proposed double-bath furnace for melting aluminum scrap entered kopilnika formed of refractory outer side, front and rear end walls, bath, limited by the hearth, the roof and walls, drain entrances and flue. The pedestal kopilnika has two layers made of lightweight brick, separated by a layer of assocarta, and the lower layer of assocarta. Bottom blocks of the platform №1 kopilnika placed on three layers of assocarta. Insulation consisting of two layers of lightweight brick, four layers of assocarta, and the lower layer of assocarta, allows to keep the temperature of the metal in the bath kopilnika. Bottom blocks of the platform, and placed on three layers of assocarta, have a high resistance and durability and can increase the service life kopilnika.

However, the double-bath reverberatory furnace for melting aluminum scrap has in each side wall, aimed at the charge devyatnadcatiletnie injection burn is the average pressure, five mixers with nozzles and centered with the provision of a flame length of 2.4 m, and fourteen are located on the periphery, providing the combustion gas-air mixture flame length 1.2 m, and two dvenadcatiletnie burner medium pressure, four mixer which is equipped with nozzles and centered with the provision of a flame length of 2.1 m, and eight are on the periphery, providing the combustion gas-air mixture flame length 1.1 m, mounted in the end wall of the furnace, directed on the tub and burden. In kopilnika inclined to the furnace hearth installed devyatnadtsatiletnyaya injection burner medium pressure, led to a bath of molten metal. This arrangement of the burners allows for high speed melting, reduction of waste (for practical data). thermal capacity of the burner is 7776 KW, which makes high-performance furnace, allowing rapid melting conditions.

When this reflective double-bath oven with kopilnika for remelting of aluminium scrap has two swivel chute mounted on brackets welded to the frame kopilnika, which rotates during casting of liquid metal and have in the design of the rotary Cup that allows you to consistently pour weld metal in the furnace filling in the equipment, located in the service sector with an angle of 143°.

Moreover, on the foundations of the furnace and kopilnika installed steel boxes with insulation between them and each wall consisting of asbestos crumbs, dual layer sheet assocarta. This design significantly reduces heat loss to the environment.

In addition, the furnace arches and kopilnika have a double layer of assocarta, which is covered with asbestos crushed, dissolved in liquid glass. This further reduces heat loss from the oven.

It should be noted that it has two entrances, designed in quick-change tap the bricks in the box, to allow replacement without stopping the furnace, and the material of pulmonary brick is a block of the platform.

Finally, the oven is equipped with a dust removal system, which includes the mixing chamber, exhaust fans, unit dedusting and dry gas cleaning plant, which makes the process of remelting of aluminum scrap environmentally friendly.

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

Figure 1 is a Longitudinal section of the furnace A-A.

Figure 2 - a Section b-B of the furnace.

Figure 3 - Cross section b-In oven.

Figure 4 - Cross section G-G of the furnace.

Figure 5 is a View dvenadcatiletnej injection burners from gazoraspredeleniye is part of the camera.

Figure 6 - Section d-D dvenadcatiletnej injection burners.

Figure 7 is a View devyatnadcatiletnie injection burner from the gas distribution chamber.

On Fig - Section e-E devyatnadcatiletnie injection burners.

Figure 9 - layout of the furnace for smelting the plot.

Figure 10 - Unit vacuum cleaners.

Figure 11 - Cyclone.

On Fig - gas purification Installation.

The proposed furnace contains mounted on the Foundation 1 furnace pedestal having two layers made of lightweight brick 2, with a double layer of assocarta 3 between them, as well as having the bottom layer and the top layer of quartz sand mixed with 4 crushed asbestos crumbs, in addition, with the top three layers of assocarta 5, which are stacked deck blocks 6 two one 1. Two layers of lightweight brick 2, with a double layer of assocarta 3 between them, the bottom layer of quartz sand 4 are located in the casing of sheet steel with a thickness of 5 mm Insulation pedestal, consisting of two layers of lightweight brick 2, four layers of assocarta and two layers of quartz sand 4. mixed with shredded asbestos crumbs, allows to keep the temperature of the metal in the bath of the furnace. Hearth blocks 6 platform No. 1, placed on three layers of assocarta 5, have a high resistance and durability and allow in order to increase the service life of the furnace. Use deck blocks 6 platform No. 1 (thickness 300 mm, width 400 mm, length 1000 mm) instead of the usual piece goods, you can reduce the number of seams that reduces permeability and increases the slag lining; allows to 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 seams between the bottom blocks 6 platform No. 1 fill pulverized dry fireclay powder, and an even better result was achieved by the author, when filled in the gap hearth blocks 6 hearth refractory powder in the upper part filled with liquid glass and then Tamazula surface flush with the top plane of the bottom refractory adhesive mastic. Double-bath furnace for melting aluminum scrap has a body formed of refractory outer side 7, the front 8 and rear 9 end walls, two baths 10 restricted pods, vault 11 and walls. Hearth blocks 6 each bath 10 is lined with a bias towards the middle of the bath 10 and laid in the middle part of the furnace wall 12 of figure 2. The wall 12 is supported in the lower part of the small vault 13, the upper part has two channel 14 connecting the space above the bath 10 furnaces with flue 15 figure 3. In the lower part of the wall 12 has two channel 16, to the which the molten metal flows into the Central channel 17 and then in the kopilnika. Above each bath 10 is assembled arch 11, one end of which rests on Pyatov bricks 15 of the side wall 7 and the second wall 12. Significantly be noted that codes of 11 furnaces have a double layer of assocarta 18, which is covered with asbestos crushed, dissolved in liquid glass. This reduces heat loss from the furnace. All walls are made of fireclay refractory brick SO. As the binder used refractory solution consisting of refractory clay (21%), refractory powder (75%), liquid glass (3%) and Toscana (alumbramiento mixture, 1%).

In the front wall 8 is made of two loading boxes into which is loaded, close the dampers 19. In the rear wall 9 of the furnace lined inclined to the furnace hearth two openings 20 for installation of two dvenadcatiletnih burners of medium pressure aimed at bath and burden, four mixer which is equipped with nozzles and centered with the provision of a flame length of 2.1 m, and eight are on the periphery, providing the combustion gas-air mixture flame length 1.1 m, figure 4, figure 5, 6. Each dvenadcatiletnyaya burner medium pressure contains stabilizing the flame tunnel 21, refractory ramming mass 22, 12 cylindrical mixers 23, United by a common weld gas distribution chamber 24, each of the mixer 23 is drilled four the e nozzle 25 at an angle of 25° to the axes. The burner includes a housing 26 that is welded to a cylindrical distribution chamber 24, in which rammed refractory ramming mass 22, cast stabilizing the flame tunnel 21, which is worn on the bottom of the cylindrical gas distribution chamber 24 and the cover 26, and is welded around the perimeter to a cylindrical distribution chamber 24. In a cylindrical distribution chamber 24 located on its periphery eight mixers 23 without nozzles, and in the Central part (smaller diameter) placed 4 mixer 27 with nozzles having on the inner surface of the moulded ribs, and in the center of the gas distribution chamber 24 is welded to a guiding device consisting of a cone 28, the axis 29, two nuts 30 for fastening the cone 28. The axle 29 is welded to a cylindrical distribution chamber 24.

Mixers, attachments for faucets, cast stabilizing the flame tunnel, all the details of the sending device is made of heat-resistant cast iron CH. When this heat-resistant cast iron, used as material for the manufacture of mixers, attachments for faucets, cast stabilizing the flame tunnel, all the details of the sending device allows to increase service life of the burner.

Each mixer 23 without a nozzle is casting and represents the pipe diameter 59×10 mm length 280 mm, in which periphery is drilled four nozzles 25 at an angle of 25°±1° to the axis of the reamer input side of 0.5 mm at an angle of 90°. Each mixer 27 with the nozzle has a nozzle 31 with a length of 50 mm on the inner surface of which there are 10 cast ribs. The nozzle 31 to the mixer in case of burning (melting in the long run), replaced by new ones, which, ultimately, increases the service life of the burner. The nozzle 32 in a cylindrical distribution chamber 24 is supplied with natural gas. Double-bath reverberatory furnace for melting aluminum scrap has in each side wall 7 devyatnadcatiletnie injection burner medium pressure directed at the charge, five mixers 27 which is supplied by nozzles 31 and centered with the provision of a flame length of 2.4 m, and fourteen of the mixer 23 is located on the periphery, providing the combustion gas-air mixture flame length 1.2 m Design devyatnadcatiletnie injection burners of medium pressure similar design dvenadcatiletnej burner medium pressure with the only difference that in the cylindrical distribution chamber 24 located on its periphery fourteen mixers 23 without nozzles, and in the Central part placed 5 mixers 27 nozzles 31, having on the inner surface of the molded ribs in the center of the gas distribution chamber is absent guiding device. In addition, thermal capacity of the burner 34% more on endcodespacerange burner medium pressure. Nominal working pressure burners 0.08 MPa. When the furnace in the furnace openings stacked injection burners. Then there is a covering of burners special refractory ramming mass private development, having the following composition:

Quartz sand;

Lignosulfonate THE technical 13-0281036-89;

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

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

Water.

On the pedestal of the furnace installed in steel conduit 33, which lined the walls of the furnace. Steel box 33, avoid Podolia, warping, reinforced vertical 34 and 35 horizontal bars No. 20 figure 1. Steel duct 33 is welded to the casing 36 of sheet steel with a thickness of 5 mm and has a thermal insulation between it and each wall consisting of asbestos chips 37 and two layers of sheet 38 assocarta. This design significantly reduces heat loss to the environment.

It should be noted that in the proposed double-bath furnace for melting aluminum scrap entered kopilnika formed of refractory outer side 39, the front 40 and rear end walls 41, tub, limited hearth 42, 43 arch and walls. The pedestal kopilnika has two layers 44, shared from lightweight brick, separated by a layer of assocarta 45, and the lower layer 46 assocarta. Two layers 44, shared easily from the forest of brick, separated by a layer of assocarta 45, and the bottom layer 46 assocarta are in steel casing 47. Bottom blocks of the platform №1 pod 42 kopilnika stacked in three layers 48 assocarta. Insulation consisting of two layers 44 a lightweight brick, three layers 48 assocarta and two layers 45,46 of assocarta, allows to keep the temperature of the metal in the bath kopilnika. Bottom blocks of the platform №1, placed on three layers of assocarta, have a high resistance and durability and can increase the service life kopilnika. On the pedestal kopilnika installed and welded to the steel casing 47 steel box 49, with insulation between them and each wall consisting of asbestos chips 50 and two layers of sheet 51 assocarta. This design significantly reduces heat loss to the environment. Code 43 kopilnika has a double layer of assocarta 52, which is covered with asbestos crumb 53 dissolved in the liquid glass. This reduces heat loss from kopilnika.

In the side wall 39 kopilnika inclined to hearth 42 installed devyatnadtsatiletnyaya injection burner medium pressure, led to a bath of molten metal. Design devyatnadcatiletnie injection burners of medium pressure discussed above. This arrangement of the burners in the furnace and the kopilnika allows to achieve high speed trunks, SN is the manifestation of intoxication (for practical data). The heat output of the burners is 7776 KW, which makes high-performance furnace, allowing rapid melting conditions. Practice operation bathrooms furnaces reflective type with forced regime melting showed that in their frenzy by 0.4-0.5% lower than in furnaces with normal melting.

In kopilnika at the bottom are two notches 54 for discharging the molten metal. Each years 54 drilled in the tap the brick 55, and tap the brick 55 is placed in a metal box 56 gunning brick in the clutch the rear wall 39 is placed in the recess and fixed by wedges (not shown). As the material of the tap bricks taken mullite polysensory block platform No. 11. When replacing worn-out gunning brick 55 metal duct 56 gunning brick from inside of him gunning brick 55 are removed from the niches, remove the old tap the brick 55, put in a metal box 56 gunning brick new gunning brick 55 and metal duct 56 gunning brick installed in new gunning brick 55 put in the niche.

When this reflective double-bath oven with kopilnika for remelting of aluminium scrap has two swivel chute 57, mounted on the bracket 58 welded to the steel duct 49, which rotates during casting of liquid metal and have in the design of the rotary Cup 59, that allows us to consistently pour weld metal in the furnace to a pouring equipment located in the service sector with an angle of 143°. In the side wall 39 kopilnika slag has a window, close the slag door 60. When loading, melting aluminum scrap, a large amount of harmful flue gases, which are caught by umbrellas 61, and then through gas pipes fall into the dust removal system, comprising: a mixing chamber 62, the exhaust fan 63, Assembly of dust collection and gas cleaning plant, which makes the process of remelting of aluminum scrap environmentally friendly. The layout of the furnace for smelting the plot is shown in Fig.9. The mixing chamber 62 is intended for dilution of flue gases air plant, resulting in the temperature of the flue gases is reduced to 150-160°C. the Thrust is created by the exhauster day-to 12.5. Behind the smoke is the dedusting unit, consisting of the chamber 64 preliminary cleaning of dust and two cyclones 65, which is the final dust from flue gases figure 10. In the chamber 64 pre-treatment unit dedusting large dust particles due to centrifugal forces to move towards the walls of the cylindrical chamber 64, glide along the walls and under the influence of gravity fall into the hopper 66, which periodically unloaded and hauled away to the dump. Two cycle of the us medium and small dust particles come in two supply nozzles 67, moreover, each of the supply nozzle is directed tangentially to the cylindrical part connected cyclone 65. When entering the cyclones 65 dusty gases get rotation, while medium and small dust particles under the action of centrifugal force dropped to their walls, and, under the action of gravity, slide down and accumulate in the hopper 68, from which periodically unloaded and hauled away to the dump. The purified air reverses direction 180° enters the conical pipe 69 and is removed in the gas purification 11.

Installation of gas cleaning is a prefab steel cylindrical housing 70, the bottom of which has a bottom swivel boot grille with holes 71. Above the lower swivel boot grating 71 is lower boot outlet 72 Fig. In the upper cylindrical part of the housing 70 is placed upper swivel boot grating 73 with holes. Above the upper swivel boot grating 73 is top loading nozzle 74. In the boot nozzles 72 and 74 is filled with an adsorbent consisting of: lime pushonki, activated charcoal, birch coal, silicagel. The top of the housing 70 has a cover 75, which is held in place by eight bolts 76 and eight nuts to the upper flange of the body 70 of the gas purification installation. On the back-end space 77 is attached the AMA 78, where the blower 79 with an electric motor 80. Maintenance platform 77 installation of gas treatment is based on four pillars 81 and has left a ladder 82. The treated adsorbent and dust' is collected in the conical section 83 of the housing 70 and discharged through the discharge pipe 84. The cleaned gases from the cyclones 65 served in the installation of dust-gas through the inlet 85. Significantly be noted that the furnace can operate on artificial or natural draught.

The oven operates on natural draft in the following way. The smelter metal and alloys rises to the service area 86 and opens the gate 87 on a gas pipe 88, while the draught of the furnace should be 2-20 DaPa. Significantly be noted that at the beginning of the two valves in the mixing chamber: one of which 89 closes or opens the flow in the exhaust flue gas, the other 90 regulates the supply of fresh air to dilute the products of combustion, necessarily closed. Includes burner stove and burner kopilnika, when this is made red-hot oven with kopilnika technological schedule calcination depending on the type of repair. After calcination close the notches 54, open valve 19 boot Windows and calcined in a furnace smelters and metal alloys load on the furnace hearth intact aluminum scrap with temperature environments is a growing environment. The flame of the four gas injection burners heat the scrap prior to melting. The metal melts and flows through two channels 16 in the wall 12, in the Central channel 17 and forth from the furnace in the kopilnika. After complete melting loaded into the furnace scrap processing flux of liquid metal in the bath kopilnika, thorough mixing of the metal in the bath kopilnika and confirmation laboratory spectral analysis marks obtained alloy, Zalewski metal down gutters 57 to filling equipment, open the tap hole 54 and the weld metal is poured from kopilnika. In the process of melting the scrap is melted, the moisture in it, evaporates, decomposing into oxygen and hydrogen, and on the furnace hearth furnace remain 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 remove the scraper from the surface of the bottom of the furnace. When loaded, smelting, casting flue gases enter the umbrellas 61, pass through the gas pipes 91, 88, proceed through the pipe 92 and removed in the atmosphere. After casting the liquid metal clean bath furnace and kopilnika from the slag tap hole plug 54 and the cycle repeats. Work on natural draft furnace is carried out in case allow the RA is the measure of the sanitary protection zone of the enterprise, during calcining, the weld metal casting or during a power outage, when you cannot smoke exhauster and dust removal system.

The oven on artificial draught is as follows. The smelter metal and alloys closes the gate 87, and gates 89 and 90 are open. 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 at the bottom of the boot nozzle 72 and the top of the boot nozzle 74 installation of gas purification, is its inclusion. The combustion products enter the umbrellas 61, pass through the gas pipe 91 into the mixing chamber 62, diluted in air of the shop, forced by fan 63 in the dedusting unit, are cleaned from dust, then get into the gas cleaning plant, where the flue gas from harmful substances in the "boiling" layer and blower 79 purified flue gases are forced through the pipe 92. The author develops a dust removal system cleans dust and harmful substances in the flue gases. The degree of purification is 75-98%. Cleaning of flue gases makes the process of melting aluminum scrap environmentally friendly.

After pouring from the furnace molten metal smelters and metal alloys open valve 19 boot Windows, furnace and clean the furnace hearth from slag and accidentally got on it before the lock. Next opens the valve 60 of the slag box kopilnika and cleaned from slag the furnace hearth kopilnika, the tap hole plug 54 and the cycle repeats.

So we double-bath gas reverberatory type furnace with kopilnika for melting aluminum scrap is high performance with long service life, low heat loss to the environment due to the special insulation, allowing the process of remelting on natural and artificial draught with a dust removal system.

1. Double-bath reverberatory furnace for melting aluminum scrap, comprising a housing formed of refractory outer side, front and rear end walls, two baths, restricted to pods, ceilings and walls, drain entrances and flues, characterized in that the housing is placed on the pedestal of the furnace having a heat-insulating layer consisting of two layers of lightweight brick, with a double layer of assocarta between them and the bottom layer and top layer of quartz sand mixed with crushed asbestos crumbs, and three layers of assocarta at the top, on which is laid hearth blocks, while it is equipped with kopilnika, comprising a housing, formed refractory outer side, front and rear end walls, bath, limited by the hearth, the roof and walls, drain tap hole, with the furnace body time is of Eden on the pedestal kopilnika and has two layers, lined with lightweight brick, separated by a layer of assocarta and bottom layer assocarta and bottom blocks kopilnika placed on three layers of assocarta, while the burner contains in the side walls of the two devyatnadcatiletnie injection burners medium pressure, five mixers with nozzles and centered with the provision of a flame length of 2.4 m, and fourteen are on the periphery, providing the combustion gas-air mixture flame length 1.2 m, and two dvenadcatiletnie burner medium pressure, four mixer which is equipped with nozzles and centered with the provision of a flame length of 2.1 m, and eight are located on the periphery providing the combustion gas-air mixture flame length 1.1 m, mounted in the end wall of the furnace, and kopilnika inclined to the furnace hearth installed devyatnadtsatiletnyaya injection burner medium pressure, the furnace is made with the possibility of remelting on natural and artificial draught system gas cleaning containing the mixing chamber, exhaust fans, unit vacuum cleaners with camera pre-treatment, two of the cyclone and the gas cleaning plant.

2. Furnace according to claim 1, characterized in that it has two entrances, designed in quick-change tap the bricks in the box, to provide the opportunity for the hair replacement without stopping the oven.

3. Furnace according to claim 1, characterized in that on the pedestals of the furnace and kopilnika installed steel boxes with insulation between them and each wall consisting of asbestos crumbs, dual layer sheet assocarta.

4. Furnace according to claim 1, characterized in that the faucets, spouts to mixers and cast stabilizing the flame tunnel, put on uniting faucets gas distribution chamber and the burner casing made of heat-resistant cast iron.

5. Furnace according to claim 1, characterized in that it has two swivel chute mounted on brackets welded to the frame kopilnika, which rotates during casting of liquid metal and have in the design of the rotary bowl for serial casting weld metal in the furnace to a pouring equipment located in the service sector with an angle of 143°.



 

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1 tbl, 3 ex

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning of silver-bearing materials by hydrometallurgy processes, for example, scrap and wastes of microelectronics. Proposed method comprises dilution of silver-bearing material in nitric acid, addition of sodium nitrate to nitrate solution at mixing, extraction of silver salt precipitate and pits treatment to get metal silver. Note here that after addition of sodium nitrate the reaction mix is held for 1 hour to add sodium carbonate or bicarbonate to pulp pH of 8-10. Free silver salt precipitate as silver carbonate is separated from the solution by filtration. Sodium nitrite and carbonate or bicarbonate is added in the dry form. Note here that sodium nitrite is taken with 25% excess of stoichiometry.

EFFECT: higher purity and yield, simplified process.

2 cl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of scattered elements, particularly, to extraction of bismuth and germanium from secondary stock sources, in particularly, to extraction of bismuth and germanium from oil-abrasive wastes of bismuth orthogermanium crystals production. Proposed method comprises hydrochloride-acid leaching of bismuth and extraction of bismuth from the solution by electrolysis. Said hydrochloride-acid leaching is performed with addition of surfactants to the solution to produce abrasive-germanium-bearing precipitate. Germanium is extracted from said precipitate by distillation of tetrachloride germanium in vapours of hydrochloric acid. Said surfactant represents the commercial mix of oxyethylated alkyl-phenols of commercial grade "АФ" 9-6 at the concentration of 0.01-0.1 wt %.

EFFECT: simplified low-cost process, higher yield.

2 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: processing method of zinc-containing metallurgical waste involves mixing of waste with coke fines, pelletisation of charge and further performance of a Waelz process in a tube-type furnace. Besides, calcium hydroxide in the amount of 20-30% of silica content in the charge and coke fines with the size of less than 1 mm in the amount of 13-17% of the charge weight are added to the charge at mixing. Charge pelletisation is performed so that granules with the size of 2-4 mm and humidity of 10-12% are obtained. Waelz process treatment is performed at the temperature of 900-1000°C.

EFFECT: improving furnace capacity and reducing flow rate of coke fines of zinc-containing metallurgical waste, for example dusts of electric-arc furnaces.

2 cl, 1 dwg, 5 tbl, 5 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

FIELD: non-iron metallurgy, in particular reprocessing of lead cakes from zinc manufacturing.

SUBSTANCE: claimed method includes heat treatment of lead cake with flux followed by smelting wherein before heat treatment mixture of lead cake, calcium hydroxide, and clinker from lead cake milling is balled to produce pellets. Pellets have fineness preferably of 30-100 mm. Method of present invention affords the ability to increase total coefficient of lead recovery by 3.1 %.

EFFECT: decreased energy consumption and reduced dust content in exhaust gas.

2 cl, 1 tbl

FIELD: noble metal hydrometallurgy.

SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.

EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.

2 ex

FIELD: sludge recovery from surface depositions of chemical equipment.

SUBSTANCE: invention relates to method for recovery of sludge containing platinum-group metals from equipment using platinum metal-based catalysts. Method includes treatment with aqueous solution of active chemical agent (e.g. sodium-ammonium-substituted ethylenediaminetetraacetic salts) while controlling pH value and removing sludge retained on treated surface with diluted aqueous solution of mineral salts or mixture thereof. pH value is adjusted at 2-10, preferably at 3-9 by adding of organic acid selected from group containing citric, oxalic, maleic, phthalic, adipic, glutaric, succinic acids or basic agents selected from sodium hydroxide, potassium hydroxide, sodium carbonate or potassium carbonate, and hydrochloric acid, sulfuric acid or phosphoric acid is used as mineral acid.

EFFECT: recovery platinum-group metal with improved yield.

4 cl, 1 tbl, 12 ex

FIELD: rare, dispersed and radioactive metal metallurgy, in particular hydrometallurgy.

SUBSTANCE: invention relates to method for reprocessing of polymetal, multicomponent, thorium-containing radwastes, formed when reprocessing of various mineral, containing rare-earth elements, Nb, Ta, To, V, Zr, Hf, W, U, etc. Method includes treatment of solution and/or slurry with alkaline agent; introducing of sulfate-containing inorganic compound solution and barium chloride; treatment of obtained hydrate-sulfate slurry with iron chloride-containing solution, and separation of radioactive precipitate from solution by filtration. As alkali agent magnesia milk containing 50-200 g/dm2 of MgO is used; treatment is carried out up to pH 8-10; sodium sulfate in amount of 6-9 g Na2SO4/dm2 is introduced as solution of sulfate-containing inorganic compound; barium chloride solution is introduced in slurry in amount of 1.5-3 g BaCl2/dm2. Hydrate-sulfate slurry is treated with solution and/or slurry containing 0.8-16 Fe3+/dm2 (as referred to startingsolution) of iron chloride, followed by treatment with high molecular flocculating agent and holding without agitation for 0.5-2 h. Radioactive precipitate is separated from mother liquor, washed with water in volume ratio of 0.5-2:1; then washed with sodium chloride-containing solution and/or slurry in volume ratio of 0.5-2:1; radioactive precipitate is removed from filter and mixed with mineral oxides in amount of 0.5-0.8 kg MgO to 1 kg of precipitate. Formed pasty composition is fed in forms and/or lingots and presses with simultaneous heating up to 80-1200C.

EFFECT: filtrate with reduced radioactivity due to increased codeposition coefficient of natural Th-232-group radioactive nuclide, in particular Ra-224 and Ra-228, with radioactive precipitates.

10 cl, 1 ex

FIELD: chemical technology; recovery of deactivated and decontaminated radioactive industrial wastes.

SUBSTANCE: proposed method that can be used for deactivating and decontaminating industrial radioactive wastes incorporating Tb-232 and their daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Sl, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like includes dissolution of wastes, treatment of solutions or pulps with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9 - 10 in the amount of 120-150% of total content of metal oxyhydrates stoichiometrically required for precipitation, pulp is filtered, and barium chloride in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp, as well as pre-diluted sulfuric acid spent 5 - 20 times in chlorine compressors in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2 are introduced in filtrate. Alternately introduced in sulfate pulp formed in the process are lime milk to pH = 11 - 12, then acid chloride wash effluents from equipment and industrial flats at pulp-to-effluents ratio of 1 : (2 - 3) to pH = 6.5 - 8.5, and pulp obtained is filtered. Decontaminated solution is discharged to sewerage system and sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization process; then 35 - 45 mass percent of inert filler, 10 - 20 mass percent of magnesium oxide, and 15 -m 25 mass percent of magnesium chloride are introduced in pasty mixture formed in the process while continuously stirring ingredients. Compound obtained is subjected to heat treatment at temperature of 80 - 120 oC and compressed by applying pressure of 60 to 80 at.

EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes due to enhanced coprecipitation of natural radionuclides.

7 c, 1 ex

FIELD: chemical technology; deactivation and decontamination of radioactive industrial products and/or wastes.

SUBSTANCE: proposed method designed for deactivation and decontamination of radioactive industrial products and/or production wastes incorporating Th-232 and its daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Al, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like and that ensures high degree of coprecipitation of natural radionuclides of filtrates, confining of radioactive metals, and their conversion to environmentally safe form (non-dusting water-insoluble solid state) includes dissolution of wastes, their treatment with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9-10 in the amount of 120-150% of that stoichiometrically required for precipitation of total content of metal oxyhydrate; then pulp is filtered and barium chloride is injected in filtrate in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp and pre-dissolved in sulfuric acid of chlorine compressors spent 5-20 times in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2. Then lime milk is added up to pH = 11 - 12 and acid chloride wash effluents of equipment and production floors are alternately introduced in sulfate pulp formed in the process at pulp-to-effluents ratio of 1 : (2-3) to pH = 6.5 - 8.5. Filtrate pulp produced in this way is filtered, decontaminated solution is discharged to sewerage system, sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization, inert filler and 0.5 - 2 parts by weight of calcium sulfate are introduced in pasty mixture while continuously stirring them. Compound obtained in the process is placed in molds, held therein at temperature of 20 - 50 oC for 12 - 36 h, and compacted in blocks whose surfaces are treated with water-repelling material.

EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes.

8 cl, 1 dwg, 1 ex

FIELD: utilization of secondary raw materials containing iron, zinc and lead, mainly wastes of steel-making process at control of basicity of Waelz process slag.

SUBSTANCE: proposed method includes mixing the charge containing raw materials and chemically active fine-grained carbon carrier, agglomeration and treatment of conglomerates thus obtained in furnace. Treatment is performed in rotary furnace working on counter-flow principle of charge and gas atmosphere; in the course of treatment, part of carbon carrier is fed to conglomerates so that total amount of carbon is lesser than 80% of amount of carbon required for reactions in charge; amount of chemically active fine-grained carbon carrier is strictly substoichiometric relative to all reactions in charge requiring carbon.

EFFECT: enhanced balance of energy of Waelz process; increased productivity; improved quality of wastes.

5 cl

FIELD: production of aluminum by electrolysis of molten salts; processing wastes of this process.

SUBSTANCE: proposed method includes delivery of solid fluorocarbon-containing wastes and oxygen-containing gas into reactor followed by high-temperature roasting for obtaining secondary raw material for production of aluminum. Finely-dispersed fluorocarbon-containing and sulfur-containing wastes are fed for roasting at weight ratio of fluorine to sulfur no less than 4:1; anode gases of electrolytic aluminum production process taken from organized gas cleaning system are used as oxygen-containing gas. Wastes are delivered in form of suspension in which liquid-to-solid ratio is maintained at 0.5-1.5:1. Proposed method improves operation of electric precipitators and ensures return of compounds in form of secondary high-quality regenerating cryolite.

EFFECT: reduced emissions of toxic agents into atmosphere.

2 cl

FIELD: waste treatment.

SUBSTANCE: multicomponent waste material is preliminarily impregnated with solution of salt of metal-collector in amount ensuring weight content of metal-collector in melt exceeding content of metallic components therein. Material is then calcined and melted in reductive atmosphere after addition of slag-forming flux based on metal fluorides. Melt is stirred and kept in liquid state over a period of time long enough to allow separation of slag and metallic phases. Resulting slag and metal are tapped and mechanically separated when solidified.

EFFECT: achieved high degree of recovering metals in collecting alloy at minimum expenses.

8 cl

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