CN218775361U - Silicon powder recovery system in chlorosilane production solid waste - Google Patents
Silicon powder recovery system in chlorosilane production solid waste Download PDFInfo
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- CN218775361U CN218775361U CN202222966485.2U CN202222966485U CN218775361U CN 218775361 U CN218775361 U CN 218775361U CN 202222966485 U CN202222966485 U CN 202222966485U CN 218775361 U CN218775361 U CN 218775361U
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Abstract
A silicon powder recovery system in solid waste in chlorosilane production comprises a silicon powder bin, wherein a solid waste conveying pipeline is arranged at the top of the silicon powder bin, a screw conveyor is arranged at the bottom of the silicon powder bin and used for conveying solid waste to a silicon powder washing tower, a silicon powder washing tank is arranged at the bottom of the silicon powder washing tank, a wastewater circulating pipeline is arranged at the bottom of the silicon powder washing tank and connected with a spraying device in the silicon powder washing tower, and a wastewater circulating pump is arranged on the wastewater circulating pipeline; and the top of the silicon powder washing tower is provided with an emptying pipeline. The utility model discloses a to equipment and process optimization, reduced the waste water volume, make silica flour obtain recycle.
Description
Technical Field
The utility model belongs to the technical field of polycrystalline silicon is useless admittedly, in particular to silica flour recovery system in chlorosilane production is useless admittedly.
Background
The silicon powder is taken as a raw material in the production of the polycrystalline silicon, is not completely reacted in the cold hydrogenation furnace and is carried into a rear system, and the cold hydrogenation is carried out of the cold hydrogenation system in a slag slurry discharging mode. The part of silicon powder has certain recycling value, and the recycling of the silicon powder has very important significance to the whole polycrystalline silicon production process.
The traditional solid treatment process flow in the polysilicon slag slurry is as follows: and (3) conveying the solid separated from the slurry into a hydrolysis tank through a screw conveyor for hydrolysis, and respectively treating tail gas and waste liquid in an independent device. However, this procedure has problems:
1) A large amount of water is needed for hydrolysis, and the water consumption is high;
2) The waste gas and liquid generated by hydrolysis need to be treated independently, and the process path is long;
3) The silica generated by hydrolysis reaction is easy to block the pipeline;
4) The silicon powder is mixed with the waste liquid for treatment, cannot be recycled, and increases solid waste.
There is therefore a need for improvements in the existing art that address the above-mentioned problems.
Disclosure of Invention
In view of the technical problem that the background art exists, the utility model provides a silica flour recovery system in chlorosilane production solid waste through to equipment and process optimization, has reduced the waste water volume, makes silica flour obtain recycle.
In order to solve the technical problem, the utility model discloses following technical scheme has been taken and has been realized:
a silicon powder recovery system in solid waste in chlorosilane production comprises a silicon powder bin, wherein a solid waste conveying pipeline is arranged at the top of the silicon powder bin, a screw conveyor is arranged at the bottom of the silicon powder bin and used for conveying solid waste to a silicon powder washing tower, a silicon powder washing tank is arranged at the bottom of the silicon powder washing tank, a wastewater circulating pipeline is arranged at the bottom of the silicon powder washing tank and connected with a spraying device in the silicon powder washing tower, and a wastewater circulating pump is arranged on the wastewater circulating pipeline; and the top of the silicon powder washing tower is provided with an emptying pipeline.
In the preferred scheme, a gas phase diversion pipeline is arranged at the top of the silicon powder bin and communicated with the silicon powder washing tower.
In a preferred scheme, the spraying device comprises a high-position spraying device and a low-position spraying device, and the connecting point of the gas-phase diversion pipeline and the silicon powder washing tower is positioned between the high-position spraying device and the low-position spraying device.
In a preferred scheme, the solid waste conveying pipeline is connected with a dryer.
This patent can reach following beneficial effect:
the utility model discloses lie in optimizing traditional polycrystalline silicon slag thick liquid mesomorphic solid processing technology flow, through increasing silicon powder storehouse, silica flour washing tower, silica flour rinsing bath and circulating pump, greatly reduced the waste water yield, guaranteed the recovery and the recycling of silica flour simultaneously effectively, more environmental protection is more economical.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a system diagram of the present invention.
In the figure: the device comprises a silicon powder bin 1, a screw conveyor 2, a silicon powder washing tower 3, a silicon powder washing pool 4, a wastewater circulating pump 5, a gas phase diversion pipeline 6, a high-level spray device 71, a low-level spray device 72 and a dryer 8.
Detailed Description
Example 1:
the preferable scheme is as shown in fig. 1, the silicon powder recovery system in solid waste in chlorosilane production comprises a silicon powder bin 1, a solid waste conveying pipeline is arranged at the top of the silicon powder bin 1, a screw conveyor 2 is arranged at the bottom of the silicon powder bin 1, the screw conveyor 2 is used for conveying solid waste to a silicon powder washing tower 3, a silicon powder washing tank 4 is arranged at the bottom of the silicon powder washing tower 3, a wastewater circulating pipeline is arranged at the bottom of the silicon powder washing tank 4, the wastewater circulating pipeline is connected with a spraying device in the silicon powder washing tower 3, and a wastewater circulating pump 5 is arranged on the wastewater circulating pipeline; and the top of the silicon powder washing tower 3 is provided with an emptying pipeline. The emptying pipeline empties the gas after the leaching.
Further, a gas-phase diversion pipeline 6 is arranged at the top of the silicon powder bin 1, and the gas-phase diversion pipeline 6 is communicated with the silicon powder washing tower 3. When the solid waste enters the silicon powder bin 1, a part of tail gas is generated, and the part of tail gas is introduced into the silicon powder washing tower 3 for cleaning.
Further, the spraying device comprises a high-level spraying device 71 and a low-level spraying device 72, and the connection point of the gas-phase diversion pipeline 6 and the silicon powder washing tower 3 is positioned between the high-level spraying device 71 and the low-level spraying device 72. And fillers are arranged below the high-level spray device 71 and the low-level spray device 72. The high-level spray device 71 mainly sprays the tail gas.
The utility model discloses well solid waste comes from desiccator 8, and the moisture content of silica flour is less than or equal to 3% in the solid useless, and its processing flow is as follows:
1. and (5) caching the solid wastes in a silicon powder bin and cooling the solid wastes to below 50 ℃.
2. Conveying the solid in the silicon powder bin to the silicon powder water washing tower through a screw conveyor for leaching, adjusting the conveying capacity by adjusting the frequency of the screw conveyor, and adjusting the pressure of the silicon powder water washing tower to be 3-10KPa by adjusting nitrogen in the silicon powder bin and the silicon powder water washing tower. Preferably, the silicon powder bin has a buffer cooling effect, so that high-temperature materials are prevented from directly entering the washing tower, and the pressure of the silicon powder bin is controlled to be 0-0.09MPa during material transferring. The spiral conveyor is controlled by frequency conversion.
3. And (3) evacuating the tail gas entering the silicon powder washing tower after the tail gas is washed, returning the waste liquid to the silicon powder washing tank, spraying and circulating a part of the waste liquid in the silicon powder washing tower through a circulating pump, and conveying a part of the waste liquid to a wastewater treatment device for neutralization. The main components of the tail gas are nitrogen, hydrogen chloride, hydrogen and the like, and the main components of the drained tail gas after leaching treatment are nitrogen and hydrogen. The waste liquid is mainly acid water.
4. After the silicon powder is deposited in the silicon powder washing tank, the silicon powder is grabbed out and bagged through a silicon powder grab machine, and is sold after being filtered and dried. The silicon powder component S after being grabbed outiMore than or equal to 50 percent (w percent), the water content is less than 30 percent, and the product can be recycled for sale.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and the protection scope of the present invention should be defined by the technical solutions described in the claims, and includes equivalent alternatives of technical features in the technical solutions described in the claims. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (4)
1. The utility model provides a silicon powder recovery system in chlorosilane production is useless admittedly, includes silicon powder storehouse (1), its characterized in that: the top of the silicon powder bin (1) is provided with a solid waste conveying pipeline, the bottom of the silicon powder bin (1) is provided with a screw conveyor (2), the screw conveyor (2) is used for conveying solid waste to the silicon powder washing tower (3), the bottom of the silicon powder washing tower (3) is provided with a silicon powder washing pool (4), the bottom of the silicon powder washing pool (4) is provided with a wastewater circulating pipeline, the wastewater circulating pipeline is connected with a spraying device in the silicon powder washing tower (3), and a wastewater circulating pump (5) is arranged on the wastewater circulating pipeline; the top of the silicon powder washing tower (3) is provided with an emptying pipeline.
2. The system for recovering the silicon powder in the chlorosilane production solid waste according to claim 1, which is characterized in that: the top of the silicon powder bin (1) is provided with a gas phase diversion pipeline (6), and the gas phase diversion pipeline (6) is communicated with the silicon powder washing tower (3).
3. The system for recovering the silicon powder in the chlorosilane production solid waste as claimed in claim 2, is characterized in that: the spraying device comprises a high-level spraying device (71) and a low-level spraying device (72), and the connecting point of the gas-phase diversion pipeline (6) and the silicon powder washing tower (3) is positioned between the high-level spraying device (71) and the low-level spraying device (72).
4. The system for recovering the silicon powder in the chlorosilane production solid waste as claimed in claim 1, which is characterized in that: the solid waste conveying pipeline is connected with a dryer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222966485.2U CN218775361U (en) | 2022-11-08 | 2022-11-08 | Silicon powder recovery system in chlorosilane production solid waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222966485.2U CN218775361U (en) | 2022-11-08 | 2022-11-08 | Silicon powder recovery system in chlorosilane production solid waste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218775361U true CN218775361U (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222966485.2U Active CN218775361U (en) | 2022-11-08 | 2022-11-08 | Silicon powder recovery system in chlorosilane production solid waste |
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| CN (1) | CN218775361U (en) |
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2022
- 2022-11-08 CN CN202222966485.2U patent/CN218775361U/en active Active
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