Silicon sludge regeneration smelting purification system
By designing a silicon sludge recycling system including pretreatment, mixing, granulation, drying and smelting devices, the problems of unreasonable regeneration and utilization structure of silicon sludge and low smelting efficiency in the prior art are solved, continuous production and efficient cooling of silicon liquid are achieved, and the quality and production efficiency of cast products are improved.
Patent Information
- Application Number
- CN202422189373.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The existing silicon sludge recycling technology has problems such as unreasonable structural layout, low smelting efficiency, unsatisfactory cooling effect of silicon liquid and easy oxidation, resulting in waste of silicon materials and high production costs.
A system including a silicon sludge pretreatment device, a mixing device, a granulating device, a drying device and a smelting device are designed. The smelting device includes a smelting furnace and a casting box. The casting box is equipped with an intermediate conductor, a casting pack, a cooling platform and a pulling tank, and the continuous casting and cooling of the silicon liquid is achieved through a translation mechanism.
This system optimizes the casting structure of the smelting furnace, realizes continuous production and efficient cooling of silicon liquid, avoids oxidation of silicon liquid, and improves the quality and production efficiency of cast products.
Smart Images
Figure CN222833999U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solid waste resource treatment and processing, and specifically relates to a silicon mud regeneration, smelting and purification system. Background Art
[0002] When diamonds cut silicon rods or ingots, in order to ensure processing accuracy and improve the surface quality of silicon wafers, auxiliary cutting fluid is needed to lubricate and flush the cutting surface to form silicon mud. Silicon mud includes silicon powder and diamond abrasive residues produced by diamond wires in the process of cutting silicon rods or ingots. The average size of the silicon powder is 1 to 5 μm. The liquid components in the silicon mud include water, cutting fluid emulsifiers such as diethylene glycol or ethylene glycol or polyethylene glycol, and surfactants. Because the size of the silicon powder in "silicon mud" is small and contains water and non-silicon impurities, it is difficult to recycle and reuse. The recycling of silicon mud is generally used as a refractory material after drying, or as a raw material for steel smelting after simple sintering, resulting in a large amount of silicon mud cannot be effectively recycled and applied in polysilicon processing. In addition, due to the low price of silicon mud and the inability to be effectively reused in silicon wafer processing, the production cost of polysilicon is limited, resulting in energy waste. In the existing technology, in order to improve the utilization rate of silicon mud, the silicon mud waste generated by polysilicon production enterprises has a high silicon content. If it is used as a refractory material, it will cause a waste of silicon materials. The waste generated by polysilicon enterprises is pre-treated, mixed with silicon dioxide, granulated, and dried, and then smelted to produce high-purity silicon ingots. This is a relatively environmentally friendly and efficient treatment method. At present, in the process of purifying silicon mud using smelting equipment, it is easy to have unreasonable structural layout. In the process of casting, the silicon liquid after smelting still has the shortcomings of unsatisfactory cooling effect, easy oxidation, and low efficiency. Therefore, it is an objective need to develop a silicon mud regeneration smelting and purification system with a reasonable structure, continuous and efficient production, and effective improvement of the quality of casting products. Summary of the invention
[0003] The utility model aims to provide a silicon mud regeneration, smelting and purification system which has a reasonable structure, continuous and efficient production and can effectively improve the quality of casting products.
[0004] The purpose of the utility model is achieved in this way, including a silicon mud pretreatment device, a mixing device, a granulation device, a drying device and a smelting device, the smelting device includes a smelting furnace and a casting box, an intermediate material guide is fixedly installed on the top of the casting box, the intermediate material guide is located below the liquid outlet of the smelting furnace, a casting bag is arranged on the upper part of the casting box, the casting bag is installed on a translation mechanism, the translation mechanism is installed on the casting box, a cooling platform is installed on the bottom of the casting box, a plurality of drawing grooves are processed at equal intervals on the cooling platform, a casting mold is slidably placed in each drawing groove, a sealing door is arranged on the casting box corresponding to each casting mold, and a cooling pipe is arranged on the cooling platform around each drawing groove.
[0005] The advantages of the utility model are: the casting structure of the smelting furnace is optimized, after the silicon liquid is smelted in the smelting furnace and discharged from the liquid outlet, it enters the casting bag through the intermediate material guide, and the casting bag can be translated in the casting box under the driving action of the translation mechanism, and the casting bag can also cast the silicon liquid into each casting mold frame during the translation process, and the translation mechanism drives the casting bag to translate for casting, and the casting speed is fast, which is conducive to improving production efficiency and realizing continuous production of smelting and casting; at the same time, the cooling pipe arranged on the cooling platform can evenly cool the silicon liquid in the casting mold, which is conducive to improving the cooling speed of the silicon ingot after casting, and in addition, the smelted silicon liquid is carried out in a relatively closed space, which can avoid product oxidation and is conducive to improving the production quality of the product, and has the advantages of reasonable structure and high production efficiency, 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 It is a schematic diagram of the structure of the smelting furnace 5 and the casting box 6 in the utility model;
[0008] Figure 3 It is a side view of the casting box 6 in the utility model;
[0009] In the figure: 1-silicon mud pretreatment device, 2-mixing device, 3-granulation device, 4-drying device, 5-smelting furnace, 6-casting box, 7-intermediate material guide, 8-casting bag, 9-cooling platform, 10-drawing groove, 11-casting mold, 12-sealed door, 13-cooling cooling pipe, 14-exhaust hood, 15-exhaust pipe, 16-induced draft fan, 17-exhaust purifier, 18-transmission screw, 19-drive motor, 20-slider, 21-exhaust pipe, 22-vacuum pump, 23-exhaust pipe, 24-main pipe, 25-gas cooling tank, 26-air supply pipe, 27-circulation pipe, 28-handle, 29-working tank, 30-electric push rod, 31-baffle. DETAILED DESCRIPTION
[0010] The present invention is 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 belong to the protection scope of the present invention.
[0011] like Figures 1 to 3As shown, the utility model includes a silicon mud pretreatment device 1, a mixing device 2, a granulating device 3, a drying device 4 and a smelting device. The silicon mud pretreatment device 1, the mixing device 2, the granulating device 3 and the drying device 4 are structures used in the prior art. The silicon mud pretreatment device 1 is used to remove impurities, crush and screen the silicon mud. The mixing device 2 adds silicon dioxide and auxiliary materials to the pretreated silicon mud. The granulating device 3 is used to make the mixed silicon mud into granules. The drying device 4 is used to dry the granular silicon mud. The smelting device includes a smelting furnace 5 and a casting box 6. The smelting furnace 5 is a structure used in the prior art and is used to heat and melt the dried silicon mud particles. The top of the casting box 6 is fixedly installed with an intermediate guide 7. The intermediate guide The device 7 includes a cone bucket and a material guide pipe installed at the bottom of the cone bucket, the intermediate material guide 7 is located below the liquid outlet of the smelting furnace 5, a casting ladle 8 is arranged at the upper part of the casting box 6, the casting ladle 8 is used to cast silicon liquid into the casting mold 11, a casting head is arranged at the bottom of the casting ladle, a valve is arranged on the casting head, the casting ladle 8 is installed on the translation mechanism, the translation mechanism is installed on the casting box 6, a cooling platform 9 is installed at the bottom of the casting box 6, a plurality of drawing grooves 10 are processed at equal intervals on the cooling platform 9, a casting mold 11 is slidably placed in each drawing groove 10, a sealing door 12 is arranged on the casting box 6 corresponding to each casting mold 11, and a cooling pipe 13 is arranged on the cooling platform 9 around each drawing groove 10.
[0012] The working process of the device is as follows: before use, the casting mold 11 is placed in the drawing groove 10 on the cooling platform 9. After the silicon liquid is smelted in the smelting furnace 5 and discharged from the liquid outlet, it enters the casting bag 8 through the intermediate material guide 7. After all the silicon liquid enters the casting bag 8, the liquid outlet of the smelting furnace 5 is closed, and the translation mechanism will drive the casting bag 8 to move. When it moves to the top of the casting mold 11, the casting head valve of the casting bag 8 is opened to cast the silicon liquid in the casting bag 8 into the casting mold 11. After the casting mold 11 is filled with silicon liquid, the casting head valve of the casting bag 8 is closed, and the translation mechanism drives the casting bag 8 to move to Above the next casting mold 11, casting can be carried out according to the above method until the silicon liquid in the casting bag 8 is completely filled into each casting mold 11. After the silicon liquid in the casting bag 8 is cast into each casting mold 11, the cooling and cooling pipe 13 will cool the casting mold 11 to accelerate the cooling speed of the silicon liquid and improve the production efficiency. In addition, the smelted silicon liquid is carried out in a relatively closed space to avoid product oxidation and help improve the production quality of the product. When the silicon liquid in the casting mold 11 is cooled and fixed, open the sealing door 12 and pull the casting mold 12 out of the push-pull groove 11.
[0013] Furthermore, in order to prevent the high-temperature flue gas generated by the discharge of silicon liquid from polluting the environment, a smoke exhaust hood 14 is arranged above the liquid outlet of the smelting furnace 5, and the smoke exhaust hood 14 is provided with a smoke exhaust pipe 15, and the smoke exhaust pipe 15 is provided with an induced draft fan 16 and an exhaust gas purifier 17. The smoke generated when the smelting furnace discharges liquid, under the action of the induced draft fan 16, passes through the smoke exhaust hood 14 and the smoke exhaust pipe 15 into the exhaust gas purifier 17 and is discharged after being treated, which can prevent the smoke from polluting the environment. The exhaust gas purifier 17 adopts the adsorption tank structure filled with adsorbent used in the prior art.
[0014] Furthermore, the translation mechanism includes a transmission screw 18 and a drive motor 19. The drive motor 19 is a structure used in the prior art, and the finished product can be directly purchased according to the power used. There are two transmission screws 18, and the two transmission screws 18 are symmetrically rotatably installed in the upper part of the casting box 6. There are two drive motors 19, and the drive motor 19 is correspondingly installed at one end of the transmission screw 18. Slide blocks 20 corresponding to the transmission screw 18 are arranged on both sides of the casting bag 8. The sliders 20 are screwed on the corresponding transmission screws 18, and reinforcing ribs are arranged between the sliders 20 and the side walls of the casting bag 8. When in use, the drive motor 19 drives the corresponding transmission screw 18 to rotate. During the rotation of the two transmission screws 18, the movable slider 20 can move along the transmission screw 18, thereby driving the casting bag 8 to reciprocate in the casting box 6.
[0015] Furthermore, in order to prevent the silicon liquid from being oxidized after casting and to further improve the casting quality, an exhaust pipe 21 is provided on the upper part of the casting box 6, and a vacuum pump 22 is provided on the exhaust pipe 21. A plurality of exhaust pipes 23 are vertically installed on the cooling platform 9, and a main pipe 24 is installed at the lower end of the plurality of exhaust pipes 23. An exhaust valve and an air pump are installed on the main pipe 24. A gas cooling tank 25 is installed at the end of the main pipe 24, and an air supply pipe 26 is provided on the gas cooling tank 25. A circulation pipe 27 connected to the casting box 6 is provided on the top of the gas cooling tank 25, and an air inlet valve is installed on the circulation pipe 27. Fresh inert gas, such as nitrogen, argon, etc., is added to the gas cooling tank 25 by using the air supply pipe 26. Before the silicon liquid enters the casting box 6, a vacuum is used to cool the silicon liquid. The pump 22 extracts the air in the casting box 6 through the exhaust pipe 21. After the air is extracted, the air inlet valve on the circulation pipe 27 is opened, and the exhaust valve on the main pipe 24 is opened to allow the inert gas in the gas cooling tank 25 to enter the casting box 6 through the circulation pipe 27. When the silicon liquid is cast through the casting bag 8, the silicon liquid can be protected from oxidation under the protection of the inert gas. At this time, the inert gas entering the casting box 6 enters the main pipe 24 through the exhaust pipe 23, and enters the gas cooling tank 25 through the main pipe 24. After being cooled in the gas cooling tank 25, it returns to the casting box 6 for recycling. In this way, the silicon liquid cast in the casting mold 11 can be cooled in a space filled with inert gas, which can avoid oxidation and is beneficial to improving the quality of the aluminum ingot. Preferably, the gas cooling tank 25 includes a tank body and a cooling jacket arranged outside the tank body. A medium inlet is arranged at the upper part of the cooling jacket, and a cooling medium is injected into the cooling jacket through the medium inlet. The tank body is cooled by the cooling medium. The cooling medium can be cooling water or cold air. A medium outlet is arranged at the lower part. A plurality of baffles are staggeredly installed up and down inside the tank body. The baffles are arranged obliquely downward. The baffles can slow down the flow speed of the inert gas in the tank body and improve the cooling effect.
[0016] In order to facilitate pulling the casting mold 11 out of the casting box 6 from the push-pull groove 10 , or pushing the casting mold 11 into the push-pull groove 10 , a handle 28 is installed on the casting mold 11 near the sealing door 12 .
[0017] Furthermore, in order to improve the cooling effect on the casting mold 11, the cooling pipe 13 is arranged in a serpentine shape around the drawing groove 10. The cooling pipe arranged in a serpentine shape has a large cooling area, which is beneficial to improving the cooling effect.
[0018] In order to prevent the casting mold 11 from moving when the silicone liquid is injected, a plurality of downwardly recessed working grooves 29 are processed on the cooling platform 9 near the side of the sealing door 12. The working grooves 29 correspond to the positions of the casting mold 11. An electric push rod 30 is vertically installed at the bottom of the working groove 29, and a baffle 31 is installed at the upper end of the electric push rod 30. The electric push rod is the equipment used in the prior art, and the finished product can be directly purchased according to the use requirements. When the casting mold 11 is pushed into the push-pull groove 10, the electric push rod 30 drives the baffle 31 to rise, and the baffle 31 will limit one end of the casting mold 11 to prevent the casting mold 11 from sliding. When the casting mold 11 is filled with silicone liquid, the electric push rod 30 drives the baffle 31 to move downward, releases the limit on the casting mold 11, and the casting mold 11 can be pulled out of the push-pull groove 10, which is quick to use.
Claims
1. A silicon mud regeneration, smelting and purification system, comprising a silicon mud pretreatment device (1), a mixing device (2), a granulation device (3), a drying device (4) and a smelting device, characterized in that: The smelting device comprises a smelting furnace (5) and a casting box (6). An intermediate material guide (7) is fixedly installed on the top of the casting box (6). The intermediate material guide (7) is located below the liquid outlet of the smelting furnace (5). A casting ladle (8) is arranged on the upper part of the casting box (6). The casting ladle (8) is installed on a translation mechanism. The translation mechanism is installed on the casting box (6). A cooling platform (9) is installed on the bottom of the casting box (6). A plurality of drawing grooves (10) are machined on the cooling platform (9) at equal intervals. A casting mold (11) is slidably placed in each drawing groove (10). A sealing door (12) is arranged on the casting box (6) corresponding to each casting mold (11). A cooling pipe (13) is arranged on the cooling platform (9) around each drawing groove (10).
2. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: A smoke exhaust hood (14) is arranged above the liquid outlet of the smelting furnace (5), a smoke exhaust pipe (15) is arranged on the smoke exhaust hood (14), and an induced draft fan (16) and an exhaust gas purifier (17) are arranged on the smoke exhaust pipe (15).
3. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: The translation mechanism comprises a transmission screw (18) and a drive motor (19), wherein the transmission screw (18) is two and the two transmission screws (18) are symmetrically rotatably mounted at the upper part of the casting box (6), and the drive motor (19) is two and the drive motor (19) is correspondingly mounted at one end of the transmission screw (18), and sliders (20) corresponding to the transmission screw (18) are arranged on both sides of the casting bag (8), and the sliders (20) are screwed and mounted on the corresponding transmission screws (18), and reinforcing ribs are arranged between the sliders (20) and the side walls of the casting bag (8).
4. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: An exhaust pipe (21) is arranged at the top of the casting box (6), and a vacuum pump (22) is arranged on the exhaust pipe (21). A plurality of exhaust pipes (23) are vertically installed on the cooling platform (9), and a main pipe (24) is installed at the lower end of the plurality of exhaust pipes (23), and an exhaust valve and an air pump are installed on the main pipe (24). A gas cooling tank (25) is installed at the end of the main pipe (24), and an air supply pipe (26) is arranged on the gas cooling tank (25). A circulation pipe (27) connected to the casting box (6) is arranged at the top of the gas cooling tank (25), and an air intake valve is installed on the circulation pipe (27).
5. A silicon mud regeneration, smelting and purification system according to claim 4, characterized in that: The gas cooling tank (25) comprises a tank body and a cooling jacket arranged outside the tank body, wherein the upper portion of the cooling jacket is provided with a medium inlet, and the lower portion is provided with a medium outlet, and a plurality of baffles are staggeredly installed up and down inside the tank body, and the baffles are arranged in an inclined downward manner.
6. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: A handle (28) is installed on the casting mold (11) at a side close to the sealing door (12).
7. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: The temperature-reducing cooling pipe (13) is arranged in a serpentine shape around the drawing groove (10).
8. A silicon mud regeneration, smelting and purification system according to claim 1, characterized in that: A plurality of downwardly recessed working grooves (29) are machined on the cooling platform (9) near the sealing door (12), the working grooves (29) corresponding to the positions of the casting mold (11), an electric push rod (30) is vertically installed at the bottom of the working groove (29), and a baffle (31) is installed at the upper end of the electric push rod (30).