RU2534691C1 - Reverberatory furnace for aluminium scrap remelting - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to a reverberatory furnace for aluminium scrap remelting. A furnace includes a housing formed with refractory external side, front and rear end walls, a storage bath and an inclined platform, which are restricted with a bottom and walls, an arch, a drainage tap-hole, a gas duct and a weld steel casing consisting of a lower part and two upper parts fixed on the lower part and located above the bottom and the inclined platform. The furnace housing is arranged inside the steel casing; besides, the furnace has a turning mechanism and is supported from a steel base. The storage bath and the inclined platform are made from mullite-corundum blocks of MKS-72 grade, which are laid onto a heat-insulating glass-fibre mullite-silica cardboard and light-weight fire-clay brick of ShL-0.4 grade. The steel casing has heat insulation between it and each wall, which consists of a triple heat-insulating glass-fibre mullite-silica cardboard, and the triple heat-insulating fibre-glass mullite-silica cardboard and heat-insulating mats arranged from above the arch. The furnace is provided in one of its side walls with two injection fifteen-mixing burners of intermediate pressure, which are directed at an angle to the inclined platform; the other side wall is provided with one injection fifteen-mixing burner; the arch is provided with two seventeen-mixing burners, which are directed at an angle to the bottom; operating and slag openings equipped with hydraulic actuators for lifting and lowering of dampers, and a three-stage dust-and-gas cleaning unit consisting of a mixing chamber, an induced draft fan, a gas cleaning block, a rough dust cleaning cyclone, and a cartridge filter for fine dust cleaning.

EFFECT: providing high furnace efficiency and possibility of performing a forced melting mode.

5 cl, 11 dwg

Description

The invention relates to ferrous metallurgy, and in particular to smelting units for remelting secondary aluminum scrap and waste aluminum alloys into ingots and ingots. The furnace can be used for refining, producing alloys, averaging the chemical composition of scrap.

A known analogue is a reflective furnace for smelting metal (RF patent information No. 2155304), comprising a housing formed by brickwork of external walls as in the claimed furnace, a storage bath and an inclined platform bounded by a hearth and walls, a vault, a drain outlet and a gas duct.

The disadvantages of this furnace are:

1. The complexity of the design due to the presence of two arches (small above the loading table and large above the bathroom);

2. Lack of external thermal insulation of the furnace, reducing heat loss to the external environment;

3. The furnace does not have a dust and gas cleaning system and during operation 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 a high rate of penetration of the charge and maintaining a forced melting mode. Due to the above disadvantages, the furnace cannot provide a solution to the technical problem.

A known analogue is a reflective furnace for remelting metal (RF patent information No. 2047663), comprising a housing formed by brickwork of the external walls as in the claimed furnace, a storage bath and an inclined platform limited by a hearth and walls, a vault, a drain outlet and a gas duct.

The furnace is designed for remelting secondary aluminum and has the following disadvantages:

1. The high cost and complexity of the accumulating heat pillows (lightweight refractory bricks, blooms). The large depth of the liquid metal in the bath complicates the mixing process, as a result of which the liquid metal will not be homogeneous;

2. Lack of external thermal insulation of the furnace, reducing heat loss to the external environment;

3. The furnace does not have a dust and gas cleaning system and during operation will pollute the environment with harmful emissions.

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

A known analogue is a reflective furnace for smelting metal (Information source RF patent No. 2361162), which is the closest (prototype), containing a housing formed by refractory outer side, front and rear end walls, as in the claimed furnace, a storage bath and an inclined platform, limited a hearth and walls, a vault, a drainage notch and a gas duct, the housing being placed on a welded frame. I believe that the oven, taken as a prototype, has the following disadvantages:

1. The furnace has high productivity, but its productivity can still be increased;

2. The furnace is stationary and cannot be transported;

3. The furnace does not have a dust and gas cleaning system and during operation will pollute the environment with harmful emissions;

4. The furnace has a step from the inclined platform to the hearth, which does not allow using the loader with a scraper to clean the hearth and inclined platform (ie, to mechanize the process of cleaning the hearth and inclined platform);

5. The hearth blocks MKRS-50 are used in the furnace, which have a sufficiently long service life, however, by using other hearth blocks for the hearth and inclined platform, it is possible to increase the life of the furnace.

The objective of the invention is the creation of a non-stationary high-performance gas bath of a reflective type furnace for remelting aluminum scrap, having a tilt mechanism for the furnace, a 3-stage dust and gas cleaning installation, which allows to reduce harmful gas emissions into the atmosphere, reduce waste and heat loss to the environment, and also increase its service life .

EFFECT: developed furnace is non-stationary high-performance, having a long service life, having a tilt mechanism that allows you to: use scrap that is not sorted from foreign inclusions, reduce waste and heat loss to the environment due to special thermal insulation, conduct the remelting process using artificial traction and from 3 -step installation of dust and gas cleaning, which makes it environmentally friendly.

The specified technical result is achieved due to the fact that in a reflective furnace for remelting aluminum scrap, containing a housing formed by refractory outer side, front and rear end walls, a storage bath and an inclined platform bounded by a hearth and walls, a roof, a drain drain and a flue, according to the present invention introduced a welded steel casing, consisting of a lower part and fixed on the lower part of the two upper parts located above the bottom and inclined platform, inside the steel casing the furnace body is placed, and the furnace has a tilting mechanism of the casing and rests on a steel base, the storage bath and the inclined platform are made of MKS-72 mullite blocks laid on heat-insulating fiberglass mullite-siliceous cardboard and lightweight chamotte brick ШЛ-0,4. Lightweight chamotte brick, heat-insulating fiberglass mullite-siliceous cardboard under the bottom and under the inclined platform can reduce heat loss, maintain the temperature of the metal in the bathtub and the inclined platform. The service life of the furnace is increased due to the use of mullite-corundum blocks MKS-72, which have high refractoriness and resistance (service life according to practical data is 7-7.5 years).

In addition, the reflective furnace for the remelting of aluminum scrap has two medium-pressure injection 15-mixing burners in one side wall, angled at an inclined platform, and one injection 15-mixing burner in the other side wall, with one injection 15-mixing burner, angled at an inclined platform, each the burner has five mixers with nozzles in the center that allow you to get a torch 2.7 meters long, the rest of the mixers are used without nozzles and have a torch 1.5 meters long, two 17-mixing burners are placed in the vault Directed at an angle to the hearth and having nine mixers with nozzles giving in combustion gas mixture torch 2.6 meters long, the remaining mixers without nozzles and allow the torch to receive a length of 1.4 meters. Mixers of all burners have: inner diameter 44 mm, outer 68 mm, four nozzles with a diameter of 1.6 mm. This arrangement of the burners makes it possible to achieve a high melting rate, reduce fumes (according to practical data), as well as load an uncontaminated charge through a slag window and quickly melt it due to the heat generated during the burning of the torches of two 17-mixing burners. The thermal power of the burners is 8740 kW, which makes the furnace highly productive, allowing for forced melting.

In this case, the reflective furnace for remelting aluminum scrap has a notch in the side wall for the release of molten metal, made in quick-change mortar brick made of mullite-corundum block MKS-72, and the summer brick is placed in the welded duct of the summer brick, which has a flange with four holes for fastening to the furnace box, in addition, the furnace has a lined chute welded to the steel casing, which together with the steel casing can tilt during the pouring of liquid metal and effectiveness to weld a casting of metal into the casting furnace equipment.

Moreover, the steel casing has thermal insulation between it and each wall, consisting of a triple insulating fiberglass mullite-siliceous cardboard, the same triple insulating fiberglass mullite-siliceous cardboard and heat-insulating mats are located on top of the roof. This further reduces heat loss from the furnace.

Further, the furnace has a hydraulic drive for raising and lowering the furnace working damper, consisting of two power cylinders, an oil pump, two rods, a cross member, two suspensions and a cast iron damper with double heat-insulating fiberglass mullite-siliceous cardboard lined with a lightweight one and a half one-and-a-half fire-resistant brick of the ShL 0.4 brand . The hydraulic drive for raising and lowering the slag damper of the furnace has a similar device. The working and slag damper of the furnace are cast from heat-resistant cast iron of grade ЧХ16 and have a long service life.

It is significant to note that the furnace is equipped with a casing rotation mechanism mounted on a steel base and consisting of two power cylinders, an oil pump, two supports, which are pivotally connected to the brackets welded to the casing in the upper part.

Finally, the reflective furnace is equipped with a 3-stage dust and gas cleaning installation to achieve an environmentally friendly process, which consists of a mixing chamber, a smoke exhaust, a gas treatment unit, a rough dust cyclone, and a cartridge filter for fine dust cleaning. The gas-cleaning unit of the dust-and-gas cleaning installation has the following characteristic: capacity for the gas to be purified 18,800 m ³ / h; the thickness of the adsorbent layer is 0.3-0.35 m; the degree of purification by hydrogen fluoride 73%; the degree of purification of copper oxide 87%; the degree of purification of carbon monoxide 94%; the degree of purification of nitric oxide 86%; the degree of purification of aluminum oxide 81%; degree of dust cleaning 94%; the temperature of the gas to be cleaned is from 20 to 120 ° C.

Introduction to the furnace design of the above devices, materials, etc. provides a solution to the problem.

The proposed design allows for the melting of scrap unsorted from foreign inclusions in the furnace, since alterations (cast iron and steel rings, liners, bushings, studs, pushers, valves, etc.) do not fall into the molten metal, and you can clean the bottom and inclined platform using a forklift equipped with a scraper.

In figure 1. Type of stove in plan.

In figure 2. A longitudinal section of aa furnace.

In figure 3. Type B of the furnace.

In figure 4. View In the oven.

In Fig.5. 15 mixing torch.

In Fig.6. Section GG 15-mixing burner.

7. Cylindrical 17-mixing torch with nozzles.

On Fig. General view of the gas treatment unit.

In Fig.9. Cyclone rough cleaning of flue gases from dust.

10. Cartridge filter.

11. View of the furnace in plan with casting equipment and installation of dust and gas cleaning.

The proposed furnace contains a housing formed by brickwork of the outer side 1, front 2 and rear 3 end walls.

Under 4 furnaces and an inclined platform 5 are laid out of mullite-corundum blocks MKS-72, item 6, laid on a heat-insulating fiberglass mullite-siliceous cardboard 7 and lightweight fireclay brick SHL-0.4 item 8 (figure 2). Lightweight fireclay brick 8, heat-insulating fiberglass mullite-siliceous cardboard 7 under the hearth 4 and under the inclined platform 5 can reduce heat loss, maintain the temperature of the metal in the bathtub and inclined platform 5. The service life of the furnace is increased due to the use of mullite-corundum blocks MKS-72 pos.6, which have high refractoriness and resistance (service life according to practical data 7-7.5 years).

The use of mullite-corundum blocks MKS-72, item 6 (large - length 1000 mm, width 400 mm, thickness 300 mm, small - length 500 mm, width 400 mm, thickness 300 mm) instead of conventional piece products, the number of joints can be reduced, which reduces gas permeability and increases slag resistance of the lining; get cost savings, because the process of prefabrication of piece refractories disappears, complete units of almost any configuration, speed up the construction process and reduce the proportion of manual labor. The seams between the MKS-72 mullite-corundum blocks are filled with liquid glass, and then “flush” with the upper plane of the hearth and the inclined platform are covered with refractory adhesive mastic. The size of the bottom is 3 × 3 meters. The size of the inclined platform is 3 × 2.4 meters. Hearth blocks are lined with direct fireclay bricks of the ShA-1 brand, product No. 5 GOST 8691-73. The furnace walls are laid out of fireclay bricks ША-1 No. 5 and No. 12 GOST 8691-73 in a steel casing. As a binder, a refractory composition is used, consisting of refractory clay (23%), fireclay powder (73%), water glass (3%) and phosphon (alumina-chromophosphate mixture 1%). The thickness of the seams is 1-2 mm, the thermal expansion joints are not laid out. In the front 2 and rear 3 end walls are made: working 9 and slag 10 windows, which have arches laid out according to the patterns from the fireclay end wedge ША-1 No. 22 and No. 23. At the top there is a vault 11 above the bottom 4 and the inclined platform 5. The vault 11 has a thermal insulation consisting of a triple insulating fiberglass mullite-siliceous cardboard 12 and heat-insulating mats 13.

A welded steel casing is introduced into the furnace design, consisting of a lower part 14 and two upper parts 15 and 16 fixed on the lower part (not shown) located respectively above the hearth 4 and the inclined platform 5, the furnace body is placed inside the steel casing, and the furnace has a mechanism tilt and rests on a steel base 17. So, the furnace is equipped with a tilt mechanism for the casing mounted on a steel base 17 and consisting of two power cylinders 18, an oil pump 19, two supports 20, which are pivotally connected to the bracket in the upper part yami 21, welded to the lower part 14 of the casing of figures 1, 2, 3. The ends of the rods 22 of the pistons of the power cylinders are pivotally attached to the supports 23, which are welded to the steel base 17. The power cylinders 18 are fixed in cages 24, which are pivotally connected to the brackets 25 welded to the lower part 14 of the steel casing of Fig.3. This design solution allows you to enable the inclination of the casing along the axis of the gutter when the hydraulic oil pump 19 is turned on. The steel casing has thermal insulation between it and each wall, consisting of a triple heat-insulating fiberglass mullite-siliceous cardboard 26. The thermal insulation of the vault and the steel casing further reduces heat loss from the furnace.

In this case, the reflective furnace for remelting aluminum scrap has a notch 27 in the side wall 1 for the release of molten metal, made in quick-change summer (not shown) brick made of mullite-corundum block МКС-72, and the summer brick is placed in the welded box of the summer brick, which has a flange with four holes for fastening to the steel casing of the furnace, in addition, the furnace has a lined chute 28 welded to the steel casing, which together with the steel casing can tilt (shown ktyr) during the casting of liquid metal and to ensure the casting of the metal deposited in the furnace into the casting equipment (in the particular case, the casting conveyor).

Further, the furnace has a hydraulic drive for raising and lowering the working valve 29 of the furnace, consisting of two power cylinders 30, an oil pump 19, two rods 31, a cross member 32, two suspensions 33 and a cast iron door with a double heat-insulating fiberglass mullite-siliceous cardboard 34 lined with a lightweight one and a half refractory brick 35, grade SHL 0.4, Fig.2, 4. The furnace has a hydraulic drive for raising and lowering the slag 36 of the furnace shutter, also consisting of two power cylinders 30, an oil pump 19, two rods 31, a cross member 32, two pendants 33 and cast-iron cast-iron damper with double heat-insulating fiberglass mullite-siliceous cardboard 34, lined with lightweight one and a half refractory brick 35, brand SHL 0.4. The difference in hydraulic actuators is that the working window of the furnace 9 is larger than the slag window 10, therefore, the damper, traction, cross member and suspension of the hydraulic actuator for raising and lowering the actuator 29 are large. The working 29 and slag 36 furnace shutters are molded from heat-resistant cast iron grade CHX16 and have a long service life.

In addition, a reflective furnace for remelting aluminum scrap has two medium-pressure injection 15-mixing 37 burners 37 in one side wall 1, angled to an inclined platform 5, and one injection 15-mixing 37 burner in the other side wall 1, angled at inclined platform 5, and each burner has five mixers 38 with nozzles 39 in the center, which make it possible to obtain a torch 2.7 meters long, the remaining mixers 40 are used without nozzles and have a torch 1.5 meters long, two 17-mixes are placed in the arch 41 burners directed at an angle to the hearth and having nine mixers 38 with nozzles 39 giving a long flame of 2.6 meters when burning the gas-air mixture, the rest of the mixers 40 without nozzles and allow to obtain a torch with a length of 1.4 meters 7. This arrangement of the burners allows to achieve a high melting speed, reduce fumes (according to practical data), as well as to load an uncontaminated charge through the slag window 10 and to quickly melt it due to the heat generated during the burning of the torches of two 17-mixing 41 burners. The thermal power of the burners is 8740 kW, which makes the furnace highly efficient, allowing forcing a forced melting mode, while the metal does not have time to oxidize and, ultimately, the waste is small. The sizes of the burners are different, but the device is the same. So the 15-mixing medium-pressure burner has a burner tunnel 42 for steady flame burning, made of stainless steel 12X18H9T and 43 casing made of steel 12X18H9T for filling the gaps between mixers with a refractory packing mass 44. Gas enters the gas distribution box 45 through fitting 46 The mixers of all burners have an inner diameter of 44 mm, an outer diameter of 68 mm, and four nozzles with a diameter of 1.6 mm. All burners were tested in the laboratory of Penzaplav LLC in Penza at a research stand. The nominal operating pressure for all burners is 0.07 MPa. When the furnace is lined, three injection burners are laid in three openings of the side walls and are blocked by large MKS-72 mullite-corundum blocks, then two burners are installed in the roof, then the burners are lined with refractory stuffed mass.

The reflective furnace is equipped with a 3-stage dust and gas cleaning installation to achieve an environmentally friendly process, which consists of a mixing chamber 47, a smoke exhauster 48, a gas treatment unit 49, a rough dust cyclone 50, a cartridge filter for fine dust cleaning 51 of Fig. 11. Since the flue gases leaving the furnace have a temperature of 850-950 ° C, a mixing chamber 47 is usually installed in front of the exhaust fan 48, in which the flue gases are diluted with workshop air, and their temperature drops to 150-170 ° C. In the mixing chamber 47, the gate 52 is designed to control the supply of flue gases to the gas treatment unit 49, and the gate 53 for the process of mixing the flue gases with the air of the workshop. For pumping flue gases into the gas cleaning unit, the DN 15 smoke exhauster pos. 48 is used.

Purification of flue gases from harmful substances is carried out in the gas treatment unit 49 of the dust and gas cleaning installation shown in Fig. 8, which has a wide range of purified harmful substances in flue gases. The cleaned gases are supplied to the gas treatment unit 49 through the inlet pipe 54. The housing 55 of the gas treatment unit 49 is steel prefabricated, a service platform 57 is attached to it on four brackets 56, and it, in turn, is supported by four supports 58. A frame 59 is fixed to the service platform 57 on which a blower 60 with an electric motor 61 is mounted. A lower rotary grill (not shown) having a rotary handle 62 is mounted in the lower part of the housing 55; the lower loading nozzle 63 is located higher. The upper part of the housing 55 is mounted an upper rotary grill (not shown) having a rotary handle 64, the upper loading nozzle 65 is located higher. Adsorbent: activated carbon, silica gel, birch charcoal, fluff lime is loaded from auxiliary ladders through the lower 63 and upper 65 loading nozzles, it is filled up respectively on lower and upper loading grilles. The spent adsorbent with the rotary handles 62 and 64 is discharged into the conical part 66 of the steel body 55, and then the operator turns the handle 67, and the spent adsorbent is poured through the lower neck of the steel body 55 into a container (not shown) and taken to a dump. To monitor the progress of the flue gas cleaning process, two eyes 68 are made in the steel casing 55. For routine maintenance, there is a chamber 69 closed by a lid 70.

The main technical characteristics of the gas cleaning unit 49 installation of dust and gas cleaning:

- clean gas performance 18800 m ³ / h - thickness of the adsorbent layer 0.3-0.35 m - degree of purification by hydrogen fluoride 73% - degree of purification for copper oxide 87% - degree of purification of carbon monoxide 94% - degree of purification for nitric oxide 86% - degree of purification by alumina 81% - degree of dust cleaning 94% - temperature of the purified gas 20 to 120 ° C - temperature of the outer surface of the installation from 45 to 55 ° C.

Coarse dust cyclone has a steel welded body 71, inside which there is a partition 72 of Fig.9. An inlet pipe 73 is welded tangentially to the upper part of the welded casing 71. An accumulation hopper 74 is welded to the welded casing 71 in the lower part, having a gate 75 for unloading dust into the process tank 76. The welded casing 71 is supported by four supports 77, which are welded to frame 78, the frame is attached to the floor of the workshop. There is an outlet pipe 79 in the upper end part of the welded body. The principle of operation is as follows: dusty flue gases enter the welded body 71 through the inlet pipe 73, large dust particles fall into the storage hopper 74, and small particles go around the partition 72 and enter through the outlet pipe 79 through pipe 80 to the cartridge filter 51 of FIG. 10.

The cartridge filter 51 is welded from sheet steel, has a housing 81, inside of which 22 cartridges (not shown) are placed for collecting fine dust. A hopper 82 for collecting dust is attached to the housing 81 of the cartridge filter 51 at the bottom, and a screw conveyor 83 is provided for removing dust from the hopper 82. There are two hatches 84 in the hopper 82. The housing 81 of the cartridge filter 51 with a hopper rests on four supports 85, s the inlet pipe 86 is located on the side of the housing 81, and the outlet pipe 87 is welded from the end of the housing 81. Dust from the cartridges is removed by a pulse of compressed air with a pressure of 6 atm, supplied from the compressor station through a pipe to ten purge valves 88. For maintenance For maintenance and repair of the filter, lower 89 and upper 90 service areas and a ladder 91 are provided.

Cartridge Filter Specifications

- performance 22000 m ³ / h - number of filter elements 22 pcs - filtration rate 0.8 m ³ / m ³ min - number of purge valves 10 pieces - thermal insulation thickness 30 mm - dimensions 3800 × 2700 × 5200 mm

It is important to note that in accordance with safety regulations the furnace has a guard 92, in addition, the design of the furnace allows it to be transported in an assembled state.

The furnace operates as follows. The metal and alloys smelter opens the gates 52 and 53, includes a smoke exhauster 48, a gas treatment unit 49, and a cartridge filter 51, while the draft in the furnace should be 2-20 daPa. Gas is supplied, burners are turned on and the furnace is calcined according to the technological schedule of calcination, depending on the type of repair. After calcination, the hydraulic drive for lifting the shutter of the working window 9 is turned on and aluminum scrap is loaded into the calcined furnace on an inclined platform 5 through the working window 9. The flame of three gas injection burners 37 heats the scrap to its melting point. The metal melts and flows down an inclined platform 5 to a 4 furnace. As molten metal accumulates on the hearth, 4 furnaces load 10 scrap without steel and cast iron inclusions into the slag window, which is melted by the torches of two burners 41. The hot flue gases rise to the roof, enter the chimney, and enter 93 through the pipe 93 into the mixing chamber 47, where they are diluted the air of the workshop and, further, the exhaust fan 48 are pumped into the gas cleaning unit 49, in which the cleaning of harmful substances. The principle of operation of the gas cleaning unit is as follows: the flue gases pass through an adsorbent layer on the loading grates, and a “fluidized bed” is formed, as a result of which the harmful substances in the flue gases are adsorbed by lime with a fluff, activated carbon, silica gel, and birch charcoal. Purification of flue gases from coarse dust occurs in the coarse cyclone 50, then through the pipe 80 flue gases are supplied to the cartridge filter 51 for cleaning from fine dust. Further, the flue gases through the chimney 94 are removed into the atmosphere. During the melting process, the scrap melts, and on the inclined platform 5, all inclusions remain, the melting temperature of which is higher than the aluminum alloy. These wastes do not fall into the molten metal, since at the end of the smelting they are removed from the inclined area with a scraper attached to the loader. After the molten scrap loaded into the furnace is completely melted, molten metal is processed with flux, the metal is thoroughly mixed in the bath, and the spectral analysis laboratory confirms the grade of the alloy obtained, the metal fill turns on the tilt mechanism, opens the notch and casts the liquid metal into the molds of the casting conveyor 95. After casting from the furnace liquid metal is a metal smelter and opens the slag window shutter 10, and cleans the bottom 4 of the slag and alterations accidentally caught on it. Every 5 days, the spent adsorbent is replaced with a new one.

The proposed design allows for the melting of scrap not sorted from foreign inclusions in the furnace, since alterations (cast iron and steel rings, liners, bushings, studs, pushers, valves, etc.) do not enter the molten metal, and clean the bottom and inclined platform it is possible to use a loader equipped with a scraper, in addition, to transport the assembled furnace, as well as equipment for the installation of dust and gas cleaning.

Claims (5)

1. Reflective furnace for remelting aluminum scrap, comprising a housing formed by refractory outer side, front and rear end walls, an accumulation bath bounded by a hearth and walls, a vault, a drain gap, a gas duct, characterized in that it has a welded steel casing consisting of a lower parts and fixed on the lower part of the two upper parts located above the bottom and the inclined platform, while inside the steel casing the furnace body is located, and the furnace has a tilt mechanism and rests on a steel base it is located in the side wall and is made of quick change brick, the storage tank and the inclined platform are made of mullite-corundum blocks of the MKS-72 brand laid on heat-insulating fiberglass mullite-siliceous cardboard and lightweight chamotte brick of the ШЛ-0,4 grade, the steel casing has thermal insulation between him and each wall of the furnace, consisting of a triple insulating fiberglass mullite-siliceous cardboard, and a triple heat-insulating fiberglass mullite-siliceous the arton and heat-insulating mats are placed on top of the roof, while the furnace has two injection fifteen mixing torches of medium pressure in one side, angled to an inclined platform, and the other side wall has one injection fifteen mixing torch, with two seventeen mixing torches directed in the roof at an angle to the hearth, and the furnace has a working and slag windows, equipped with hydraulic actuators for raising and lowering the shutter, a three-stage installation of dust and gas cleaning, oyaschuyu from the mixing chamber, exhaust, gas treatment unit, cyclone coarse dust and a filter cartridge for fine purification from dust. 2. The furnace according to claim 1, characterized in that it has a hydraulic drive for raising and lowering the working flap of the furnace and a hydraulic drive for raising and lowering the slag damper of the furnace, each of which consists of two power cylinders, an oil pump, two rods, a cross member, two suspensions, and working and slag shutters cast from heat-resistant cast iron of the ХX16 brand with double heat-insulating fiberglass mullite-siliceous cardboard, lined with lightweight one-and-a-half one-and-a-half fire-resistant brick of the ШЛ 0.4 grade. 3. The furnace according to claim 1, characterized in that it has a notch in the side wall for the release of molten metal, made in a quick change brick made of mullite-corundum block brand MKS-72, and the brick is placed in the welded box of the brick, which has flanging with four holes for fastening to the furnace box, while the furnace has a lined chute welded to the steel casing, made with the possibility of tilting with the steel casing during casting of molten metal to ensure casting and metal deposited in the furnace into the filling equipment. 4. The furnace according to claim 1, characterized in that the gas-cleaning unit of the dust-and-gas cleaning installation has a gas throughput of 18,800 m ³ / h, an adsorbent layer thickness of 0.3-0.35 m, a degree of purification of hydrogen fluoride of 73%, a degree of purification for copper oxide 87%, the degree of purification for carbon monoxide 94%, the degree of purification for nitric oxide 86%, the degree of purification for alumina 81%, the degree of purification for dust 94%, the temperature of the gas to be cleaned from 20 to 120 ° C. 5. The furnace according to claim 1, characterized in that each fifteen-mixing burner has five mixers in the center with nozzles providing a torch with a length of 2.7 meters, the remaining mixers without nozzles provide a torch with a length of 1.5 meters, seventeen-mixing burners have nine mixers made with ribs at their ends inside the central channel to receive a 2.6-meter torch when burning a gas-air mixture, the remaining mixers without nozzles with a torch length of 1.4 meters, and the mixers of all burners have an internal diameter of 44 mm, an external 68 mm Four nozzles with a diameter of 1.6 mm.

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