Recycling device for slag of metal silicon smelting furnace

Abstract

The utility model discloses a metal silicon smelting furnace slag recycling device which comprises a crusher and a material storage pool, a stirring reaction tank is connected above the material storage pool through an elevator, the top of the stirring reaction tank is connected with a solvent tank, and a bottom outlet of the stirring reaction tank is connected with a separator. An overflow pipe is arranged on the side, opposite to the slag discharging pipe, of the separator, an outlet of the overflow pipe is connected with a first filter press, a slag outlet of the first filter press is connected with a first drying machine, a liquid outlet of the first filter press is connected with a circulating pool, a circulating pipe communicated with the liquid inlet pipe is arranged on the circulating pool, and a circulating pump is installed on the circulating pipe. A bottom outlet of the separator is connected with a second filter press through a liquid guide pipe, a slag outlet of the second filter press is connected with a second drying machine, and a liquid outlet of the second filter press is connected with a sewage pool. The system not only can reduce the pollution to the environment, but also can realize the efficient recovery of monatomic silicon, and can realize the recycling of the dissolving agent.

Description

Technical Field

[0001] The utility model belongs to the technical field of solid waste resource treatment and processing, and particularly relates to a device for recycling slag from a metallic silicon smelting furnace. Background Art

[0002] Silicon metal is a material widely used in industry and electronics. During the smelting process, approximately 200 kg of slag is produced for every 2 tons of metallic silicon produced. Annual silicon metal production in my country generates 300,000 tons of slag, with the silicon content in this slag reaching approximately 15%. Directly landfilling this waste not only wastes significant resources but also causes significant environmental pollution. Currently, the recycling process for slag produced by metallic silicon smelting involves manually separating and crushing the light and dark slag in the slag with a hammer. The slag is then sorted based on differences in density, particle size, shape, and speed and direction of movement in water. The silicon is then treated with hydrofluoric acid (HF) to form Si-F bonds on the silicon surface, increasing its hydrophobicity. Industrial silicon is then extracted from the slag using a two-step flotation process by adding flotation agents such as frothers and collectors. Finally, a medium-frequency electromagnetic induction melting furnace is used to add the silicon slag and slag agents (Na2O, SiO2, CaCl2, CaO) to the furnace, where argon is introduced for stirring. The mixture is stirred at 1550°C for 2 hours, smelted in an electric purification furnace, and the resulting silicon melt flows into a ladle. The molten silicon is then transported by a crane to the casting area for casting, where the silicon component is recovered. The above-mentioned treatment process and treatment system have the following shortcomings during use: First, the treatment process of the treatment system is long, and it uses sorting and flotation to separate the silicon components, which has poor separation effect. The amount of solvents such as hydrofluoric acid and frothers used is large, and the treatment cost is high. Flotation produces a large amount of waste acid and wastewater, which will cause serious environmental pollution. Therefore, it is necessary to develop a recycling device for metallic silicon smelting furnace slag with a simple treatment process, low treatment cost, low pollution, and the ability to significantly improve the recovery rate of elemental silicon. Summary of the Invention

[0003] The purpose of the utility model is to provide a recycling device for metallic silicon smelting furnace slag, which has a simple processing flow, low processing cost, low pollution, and can significantly improve the recovery rate of elemental silicon.

[0004] The purpose of the present utility model is achieved in that it includes a crusher and a storage tank arranged below the crusher, a stirring reaction tank is connected to the top of the storage tank through a hoist, the top of the stirring reaction tank is connected to the solvent tank through a liquid inlet pipe, the bottom outlet of the stirring reaction tank is connected to a separator through a slag discharge pipe, a sedimentation separation component is arranged inside the separator, an overflow pipe is arranged on the separator on the side opposite to the slag discharge pipe, the outlet of the overflow pipe is connected to a first filter press, the slag outlet of the first filter press is connected to a first dryer, the liquid outlet of the first filter press is connected to a circulation pool, a circulation pipe connected to the liquid inlet pipe is arranged on the circulation pool, a circulation pump is installed on the circulation pipe, the bottom outlet of the separator is connected to a second filter press through a liquid guide pipe, the slag outlet of the second filter press is connected to a second dryer, and the liquid outlet of the second filter press is connected to a sewage pool.

[0005] Compared with the existing technology, the advantages of this device are: this device optimizes the slag recovery process, the slag produced by metal silicon smelting is first crushed by a crusher, the crushed slag particles are sent to the stirred reactor through an elevator, and then a solvent is added to the stirred reactor. The solvent and the slag particles are mixed and reacted in the stirred reactor to form a solid-liquid mixture. The formed solid-liquid mixture enters the separator for separation, and the slag solution is separated and filtered by the second filter press. The wastewater enters the recovery pool and enters the wastewater treatment system. The filter residue can be used as a raw material for sintered bricks after drying, and the elemental silicon solution separated by the separator enters the first filter for filtration, and the filtrate is stored in the circulation The silicon in the pool is returned to the stirred reactor through a circulation pipe for recycling, and the elemental silicon in the filter residue can be efficiently recovered after being dried by the first dryer. The device uses a stirred reactor and a separator to separate the silicon component in the slag, which can reduce the amount of solvent used and the cost of use, and can effectively avoid the generation of waste acid, reduce the discharge of waste water and reduce pollution to the environment. At the same time, it can achieve complete separation of silicon components, achieve efficient recovery of elemental silicon, and achieve recycling of solvents, which can further reduce production costs. It has the advantages of short processing flow, low pollution, low operating cost and high recovery rate, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0007] Figure 2 This is a schematic structural diagram of the stirring reaction tank 3 in the present invention;

[0008] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0009] In the figure: 1-crusher, 2-storage tank, 3-stirring reaction tank, 31-horizontal rotating shaft, 32-stirring rod, 33-vertical rotating shaft, 34-first motor, 35-stirring blade, 36-second motor, 37-drive shaft, 38-driving bevel gear, 39-driven bevel gear, 310-drive screw, 311-lifting slider, 312-guide rod, 313-top plate, 4-solvent tank, 5-slag discharge pipe, 6-separator, 61-sedimentation plate, 62-cone bucket, 7-overflow pipe, 8-first filter press, 9-first dryer, 10-circulating tank, 11-circulating pipe, 12-liquid guide pipe, 13-second filter press, 14-second dryer, 15-sewage tank, 16-elevator, 17-working box, 18-insulation layer. DETAILED DESCRIPTION

[0010] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the scope of protection of the present invention.

[0011] like Figures 1 to 3 As shown, the utility model includes a crusher 1 and a storage tank 2 arranged below the crusher 1. The storage tank 2 is connected to a stirring reaction tank 3 via an elevator 16. The crusher 1 and the elevator 16 are structures used in the prior art. The top of the stirring reaction tank 3 is connected to a solvent tank 4 via a liquid inlet pipe. The solvent tank 4 stores a dissolving agent. The dissolving agent chamber heats water to 45-80°C, adds a predetermined amount of sodium silicate and caustic soda to the water, and makes the specific gravity of the solution between 1.04-1.15 kg / m 3 The bottom outlet of the stirred reactor 3 is connected to a separator 6 through a slag discharge pipe 5, a sedimentation separation component is provided inside the separator 6, an overflow pipe 7 is provided on the separator 6 on the side opposite to the slag discharge pipe 5, the outlet of the overflow pipe 7 is connected to a first filter press 8, the slag outlet of the first filter press 8 is connected to a first dryer 9, the liquid outlet of the first filter press 8 is connected to a circulation pool 10, the circulation pool 10 is provided with a circulation pipe 11 connected to the liquid inlet pipe, and a circulation pump is installed on the circulation pipe 11, the bottom outlet of the separator 6 is connected to a second filter press 13 through a liquid guide pipe 12, the slag outlet of the second filter press 13 is connected to a second dryer 14, the liquid outlet of the second filter press 14 is connected to a sewage pool 15, and the first filter press 8 and the second filter press can adopt the plate and frame filter press structure used in the prior art.

[0012] The working process of this system is as follows: the slag produced by the smelting furnace is first crushed by the crusher 1, and the crushed slag particles enter the storage tank 2. The slag particles in the storage tank 2 are lifted by the elevator 16 to the stirred reaction tank 3, and then the solvent in the solvent tank 3 is added to the stirred reaction tank 3. After the slag particles and the solvent in the stirred reaction tank 3 react in the stirred reaction tank 3, they are discharged from the stirred reaction tank 3 into the separator 6. After separation in the separator 6, the elemental silicon solution is discharged through the overflow pipe 7 and enters the first In the filter press 8, after the filtration by the first filter press 8, the elemental silicon is dried by the first dryer 9 and then recycled. The solvent discharged from the filter enters the circulation pool 10 and returns to the stirred reactor 3 through the circulation pipe 11 for recycling to avoid waste. The slag-containing solution separated by the separator 6 enters the second filter press 13 for pressure filtration. The filter residue enters the second dryer 14 for drying and can be used as a raw material for brick making. The wastewater generated by the pressure filtration of the second filter press 13 enters the sewage pool 15 for subsequent purification treatment. This system can separate the silicon component in the slag by using the stirred reactor 3 and the separator 6 in combination. This can reduce the amount of solvent used and the cost of use, and can effectively avoid the generation of waste acid, reduce the discharge of wastewater, and reduce pollution to the environment. At the same time, it can achieve a thorough separation of the silicon component, achieve efficient recovery of elemental silicon, and achieve recycling of the solvent, which can further reduce the cost of production.

[0013] In order to improve the production efficiency, 2 to 3 stirred reaction tanks 3 are provided, and a hoist 16 is provided between each stirred reaction tank 3 and the storage tank 2. When multiple stirred reaction tanks 3 are working, the reactant materials can be continuously transported to the separator 6, which can improve the production efficiency.

[0014] In order to improve the effect of the reaction between the slag particles and the dissolving agent, a lower agitator is provided at the lower part of the stirred reaction tank 3, and the lower agitator can stir the lower part of the stirred reaction tank 3 in a horizontal direction. An upper agitator is provided at the upper part of the stirred reaction tank 3, and the upper agitator can stir the upper part of the stirred reaction tank in a vertical direction. The lower agitator includes a horizontal rotating shaft 31 and a driving assembly. The horizontal rotating shaft 31 is horizontally rotated and installed at the lower part of the stirred reaction tank 3. A plurality of stirring rods 32 are evenly installed on the horizontal rotating shaft 31. The driving assembly is installed on the outside of the stirred reaction tank 3 and is transmission-connected to one end of the horizontal rotating shaft 31. The upper agitator includes a vertical rotating shaft 33 and a first motor 34. The first motor 34 is an existing The structure used in the technology can be directly purchased as a finished product according to the power used. The vertical shaft 33 is vertically rotated and installed in the upper part of the stirred reaction tank 3. A plurality of stirring blades 35 are evenly installed on the vertical shaft 33. The stirring blades 35 are in a wavy structure. The first motor 34 is installed above the stirred reaction tank 3 and is transmission-connected to the vertical shaft 33. When in use, the driving component drives the horizontal shaft 31 to rotate. The rotation of the horizontal shaft 31 can drive the stirring rod 32 to rotate, thereby stirring the lower part of the stirred reaction tank 3. At the same time, the first motor 34 drives the vertical shaft 33 to rotate. During the rotation of the vertical shaft 33, the stirring blades 35 can be driven to stir the upper part of the stirred reaction tank 3. Preferably, in order to improve stirring The efficiency of the drive assembly includes a second motor 36, a transmission shaft 37, a driving bevel gear 38 and a driven bevel gear 39. The second motor is a structure used in the prior art. The finished product can be directly purchased according to the power used. A working box 17 is provided on the outside of the stirred reaction tank 3. The second motor 36 is installed in the working box 17. The transmission shaft 37 is installed on the output shaft of the second motor 36. The driving bevel gear 38 is installed on the transmission shaft 37. The driven bevel gear 39 is installed at the end of the horizontal shaft 31 and meshes with the driving bevel gear 38. A lifting mechanism connected to the upper agitator is installed on the drive assembly. The lifting mechanism includes a transmission screw 310, a lifting slider 311 and a guide rod 312. The transmission screw The lower end of 310 is fixedly connected to the transmission shaft 37, and the transmission screw 310 is rotatably mounted on the transmission shaft 37. The lower ends of the guide rods 312 are mounted on the lifting sliders 311 on both sides of the transmission screw 310. The upper ends of the guide rods 312 extend to the top of the stirred reaction tank 3 after passing through the working box 17. A top plate 313 is installed on the top of the guide rod 312. The upper end of the horizontal shaft 31 is rotatably mounted on the top plate 313. The second motor 36 is mounted above the top plate 313 and is transmission-connected to the horizontal shaft 31. When in use, the second motor 36 is turned on, and the second motor 36 drives the transmission shaft 37 to rotate. The rotation of the transmission shaft 37 drives the active bevel gear 38 to rotate, and then rotates through the driven bevel gear 39 and the horizontal shaft 31. At the same time,When the transmission shaft 37 rotates, it can drive the transmission screw 310 to rotate. When the transmission screw 310 rotates, it can drive the lifting slider 311 to rotate on the transmission screw 310. When the lifting slider 311 moves, it can drive the guide rod 312 and the top plate 313 to move back and forth. When the top plate 313 moves, it can drive the second motor 36 and the vertical shaft 33 to move up and down, which is conducive to improving the mixing efficiency.

[0015] Furthermore, the sedimentation separation component includes a plurality of sedimentation plates 61 arranged vertically at equal intervals in the separator 6, a gap being left between the top of the sedimentation plate 61 and the top of the separator 6, the height of the sedimentation plate 61 in the separator 6 gradually decreasing from the slag discharge pipe 5 to the overflow pipe 7 end, and a cone hopper 62 is provided at the bottom between the separator 6 and the sedimentation plate 61 and the bottom between two adjacent sedimentation plates 61. The bottom of the cone hopper 62 is connected to the liquid guide tube 12 through a short tube. After the reaction material in the stirred reaction tank 3 enters the separator 6, the tailings not containing elemental silicon fall to the bottom of the cone hopper 62 after multi-stage sedimentation of multiple sedimentation plates 61, and the elemental silicon floats to the surface of the solution through chemical reaction and is discharged through the overflow pipe 7.

[0016] In order to prevent the temperature in the stirred reaction tank 3 and the separator 6 from decreasing and to improve the separation effect of elemental silicon, a heat-insulating layer 18 is provided on the outer walls of the stirred reaction tank 3 and the separator 6 .

Claims

1. A device for recycling slag from a metallic silicon smelting furnace, characterized by: The invention comprises a crusher (1) and a storage tank (2) arranged below the crusher (1); a stirring reaction tank (3) is connected to the storage tank (2) via a hoist (16); the top of the stirring reaction tank (3) is connected to a solvent tank (4) via a liquid inlet pipe; the bottom outlet of the stirring reaction tank (3) is connected to a separator (6) via a slag discharge pipe (5); a sedimentation separation component is arranged inside the separator (6); an overflow pipe (7) is arranged on the separator (6) on the side opposite to the slag discharge pipe (5); the outlet of the overflow pipe (7) is connected to a first filter press The filter press (8) is a filter press having a slag outlet connected to a first dryer (9), a liquid outlet of the first filter press (8) is connected to a circulation pool (10), a circulation pipe (11) connected to a liquid inlet pipe is provided on the circulation pool (10), a circulation pump is installed on the circulation pipe (11), the bottom outlet of the separator (6) is connected to a second filter press (13) through a liquid guide pipe (12), the slag outlet of the second filter press (13) is connected to a second dryer (14), and the liquid outlet of the second filter press (13) is connected to a sewage pool (15).

2. The device for recycling slag from a metallic silicon smelting furnace according to claim 1, characterized in that: There are 2 to 3 stirring reaction tanks (3), and a hoist (16) is provided between each stirring reaction tank (3) and the storage tank (2).

3. The device for recycling slag from a metallic silicon smelting furnace according to claim 2, characterized in that: A lower stirrer is provided at the lower portion of the stirred reaction tank (3), and an upper stirrer is provided at the upper portion of the stirred reaction tank (3). The lower stirrer comprises a horizontal rotating shaft (31) and a driving assembly. The horizontal rotating shaft (31) is horizontally rotatably mounted at the lower portion of the stirred reaction tank (3). A plurality of stirring rods (32) are evenly mounted on the horizontal rotating shaft (31). The driving assembly is mounted on the outer side of the stirred reaction tank (3) and is transmission-connected to one end of the horizontal rotating shaft (31). The upper stirrer comprises a vertical rotating shaft (33) and a first motor (34). The vertical rotating shaft (33) is vertically rotatably mounted at the upper portion of the stirred reaction tank (3). A plurality of stirring blades (35) are evenly mounted on the vertical rotating shaft (33). The stirring blades (35) are in a wavy structure. The first motor (34) is mounted above the stirred reaction tank (3) and is transmission-connected to the vertical rotating shaft (33).

4. The device for recycling slag from a metallic silicon smelting furnace according to claim 3, characterized in that: The driving assembly comprises a second motor (36), a transmission shaft (37), a driving bevel gear (38) and a driven bevel gear (39); a working box (17) is provided on the outside of the stirring reaction tank (3); the second motor (36) is installed in the working box (17); the transmission shaft (37) is installed on the output shaft of the second motor (36); the driving bevel gear (38) is installed on the transmission shaft (37); and the driven bevel gear (39) is installed at the end of the horizontal rotating shaft (31) and meshes with the driving bevel gear (38).

5. The device for recycling slag from a metallic silicon smelting furnace according to claim 4, characterized in that: The driving assembly is provided with a lifting mechanism which is in transmission connection with the upper stirrer.

6. The device for recycling slag from a metallic silicon smelting furnace according to claim 5, characterized in that: The lifting mechanism comprises a transmission screw (310), a lifting slider (311) and a guide rod (312). The lower end of the transmission screw (310) is fixedly connected to the transmission shaft (37). The transmission screw (310) is rotatably mounted on the transmission shaft (37). The lower ends of the guide rods (312) are mounted on the lifting sliders (311) on both sides of the transmission screw (310). The upper ends of the guide rods (312) pass through the working box (17) and extend to the top of the stirring reaction tank (3). A top plate (313) is mounted on the top of the guide rod (312). The upper end of the horizontal rotating shaft (31) is rotatably mounted on the top plate (313). The second motor (36) is mounted above the top plate (313) and is transmission-connected to the horizontal rotating shaft (31).

7. The device for recycling slag from a metallic silicon smelting furnace according to claim 1, characterized in that: The sedimentation separation assembly comprises a plurality of sedimentation plates (61) vertically arranged at equal intervals in the separator (6), a gap being left between the top of the sedimentation plates (61) and the top of the separator (6), the height of the sedimentation plates (61) in the separator (6) gradually decreasing from the slag discharge pipe (5) to the end of the overflow pipe (7), a cone hopper (62) being provided at the bottom between the separator (6) and the sedimentation plate (61) and the bottom between two adjacent sedimentation plates (61), the bottom of the cone hopper (62) being connected to the liquid guide pipe (12) via a short tube.

8. The device for recycling slag from a metallic silicon smelting furnace according to claim 1, characterized in that: A heat-insulating layer (18) is provided on the outer walls of the stirring reaction tank (3) and the separator (6).

Images