Reactor for preparing silicon dioxide by using chlorosilane waste gas

Abstract

The utility model relates to a reactor for preparing silicon dioxide by using chlorosilane waste gas, which comprises a reaction kettle, a stirring device and a carbon dioxide input device, a silicate waste liquid inlet is arranged at the top in the reaction kettle, and the carbon dioxide input device is connected with the reaction kettle and is used for introducing carbon dioxide gas into the reaction kettle; the stirring device is arranged in the reaction kettle and used for stirring silicate waste liquid in the reaction kettle to promote mixing of the waste liquid and carbon dioxide gas, the carbon dioxide input device comprises a carbon dioxide gas inlet, a gas conveying pipe and a dispersion disc, the carbon dioxide gas inlet is formed in the top of the reaction kettle, and the dispersion disc is arranged in the reaction kettle; the dispersion disc is arranged at the bottom of the reaction kettle and is connected with the carbon dioxide gas inlet through a gas conveying pipe, a plurality of gas outlets are densely distributed in the dispersion disc, and carbon dioxide gas is dispersed in the reaction kettle through the gas outlets. According to the utility model, the silicate waste liquid and the carbon dioxide gas are fully mixed and reacted, and the preparation efficiency of silicon dioxide is improved.

Description

Technical Field

[0001] This utility model relates to the field of chlorosilane waste gas treatment technology, specifically to a reactor for preparing silicon dioxide using chlorosilane waste gas. Background Technology

[0002] The production processes of polysilicon, granular silicon, and organosilicon all involve the emission of chlorosilane waste gas. As production capacity continues to increase, the amount of chlorosilane waste gas also increases, making the treatment of this waste gas particularly important. Currently, the mainstream methods are alkaline rinsing and incineration. Incineration produces a large amount of granular waste ash, which needs to be treated by companies with professional hazardous waste treatment qualifications. Alkaline rinsing produces a large amount of silicate waste liquid, which also needs to be treated to meet wastewater standards before it can be discharged, which is a significant expense for factories. Utility Model Content

[0003] The purpose of this invention is to provide a reactor for preparing silicon dioxide using chlorosilane waste gas, thereby solving the aforementioned problems existing in the current treatment of chlorosilane waste gas.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A reactor for preparing silica using chlorosilane waste gas includes a reaction vessel, a stirring device, and a carbon dioxide input device. A silicate waste liquid inlet is located at the top of the reaction vessel. The carbon dioxide input device is connected to the reaction vessel for introducing carbon dioxide gas into the reaction vessel. The stirring device is located in the reaction vessel for stirring the silicate waste liquid to promote mixing with the carbon dioxide gas. The carbon dioxide input device includes a carbon dioxide gas inlet, a gas delivery pipe, and a dispersion plate. The carbon dioxide gas inlet is located at the top of the reaction vessel, and the dispersion plate is located inside the reaction vessel at the bottom. The dispersion plate is connected to the carbon dioxide gas inlet via the gas delivery pipe, and the dispersion plate has multiple gas outlet holes densely distributed on it, through which carbon dioxide gas is dispersed in the reaction vessel.

[0006] Furthermore, the stirring device includes a drive motor, a reducer, a stirring shaft, and a blade assembly. The stirring shaft is arranged vertically in the reactor. The drive motor is located at the top of the reactor and connected to the stirring shaft via the reducer. The blade assembly is arranged on the stirring shaft and is driven by the drive motor to rotate, thereby promoting the mixing of silicate waste liquid and carbon dioxide gas.

[0007] Furthermore, the blade assembly includes a first blade and a second blade. The first blade is disposed at the lower part of the stirring shaft, and the second blade is disposed at the upper part of the stirring shaft. The first blade is arranged vertically, and by rotating the first blade, the vertically upward carbon dioxide gas flow is stirred and dispersed in the surrounding horizontal direction. The second blade is arranged at an angle, and by rotating the second blade, the dispersed gas-liquid mixture circulates vertically up and down.

[0008] Furthermore, the bottom of the reactor is provided with a drain outlet and a slag outlet.

[0009] Furthermore, a temperature sensor for detecting the reaction temperature is provided on the side wall of the reactor.

[0010] The beneficial effects of this utility model are:

[0011] This invention relates to a reactor for preparing silica from chlorosilane waste gas. The carbon dioxide input device features a dispersion disc with densely distributed vent holes, allowing carbon dioxide gas to be uniformly dispersed in the reaction vessel as fine bubbles. This increases the contact area between the gas and the waste liquid, thereby enhancing the uniformity of the reaction and improving the yield and purity of silica. The included stirring device efficiently mixes the silicate waste liquid with carbon dioxide gas, significantly improving reaction efficiency and shortening reaction time. This invention effectively utilizes chlorosilane waste gas as a raw material to prepare silica through its reaction with silicate waste liquid, solving the problem of waste gas treatment, achieving resource recycling, and reducing production costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the reactor for preparing silicon dioxide using chlorosilane waste gas according to this utility model.

[0013] The names corresponding to each mark in the diagram:

[0014] 1. Reactor; 11. Silicate waste liquid inlet; 12. Drain outlet; 13. Slag outlet; 14. Temperature sensor.

[0015] 2. Stirring device; 21. Drive motor; 22. Reducer; 23. Stirring shaft; 24. Blade assembly; 241. First blade; 242. Second blade.

[0016] 3. Carbon dioxide input device; 31. Carbon dioxide gas inlet; 32. Gas delivery pipe; 33. Dispersion plate. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] like Figure 1 As shown, this utility model provides a reactor for preparing silica using chlorosilane waste gas, comprising a reaction vessel 1, a stirring device 2, and a carbon dioxide input device 3. A silicate waste liquid inlet 11 is provided at the top of the reaction vessel 1 for adding silicate waste liquid into the reaction vessel 1. The carbon dioxide input device 3 is connected to the reaction vessel 1 for introducing carbon dioxide gas into the reaction vessel 1. The stirring device 2 is disposed in the reaction vessel 1 for stirring the silicate waste liquid in the reaction vessel 1 to promote thorough mixing of the waste liquid and carbon dioxide gas, thereby reacting to generate silica.

[0019] Specifically, the carbon dioxide input device 3 includes a carbon dioxide gas inlet 31, a gas delivery pipe 32, and a dispersion plate 33. The carbon dioxide gas inlet 31 is located at the top of the reactor 1 for easy input of carbon dioxide gas. The dispersion plate 33 is located inside the reactor 1 and at the bottom of the reactor 1 to ensure that the carbon dioxide gas is uniformly dispersed in the reactor 1. The dispersion plate 33 is connected to the carbon dioxide gas inlet 31 through the gas delivery pipe 32 to realize the transmission of carbon dioxide gas. The dispersion plate 33 is densely covered with multiple gas outlet holes. Through the gas outlet holes, the carbon dioxide gas is dispersed in the reactor 1 in the form of fine bubbles, which increases the contact area between the gas and the silicate waste liquid and is beneficial to the reaction.

[0020] The stirring device 2 includes a drive motor 21, a reducer 22, a stirring shaft 23, and a blade assembly 24. The stirring shaft 23 is arranged vertically in the reactor 1, and the drive motor 21 is located at the top of the reactor 1 and connected to the stirring shaft 23 via the reducer 22. The blade assembly 24 is mounted on the stirring shaft 23 and is driven to rotate by the drive motor 21, thereby generating a strong stirring effect and promoting the thorough mixing of silicate waste liquid and carbon dioxide gas.

[0021] Furthermore, the impeller assembly 24 includes a first impeller 241 and a second impeller 242. The first impeller 241 is disposed at the lower part of the stirring shaft 23 and is arranged vertically. The rotation of the first impeller 241 disperses the vertically upward carbon dioxide gas flow horizontally, making the gas more evenly distributed in the waste liquid. The second impeller 242 is disposed at the upper part of the stirring shaft 23 and is arranged at an angle. The rotation of the second impeller 242 causes the dispersed gas-liquid mixture to circulate vertically, further enhancing the mixing effect.

[0022] The bottom of the reactor 1 is equipped with a drain outlet 12 and a slag outlet 13. The drain outlet 12 is used to drain the water generated during the reaction, and the slag outlet 13 is used to drain the silica precipitate generated during the reaction and other possible impurities.

[0023] In addition, a temperature sensor 14 for detecting the reaction temperature is installed on the side wall of the reactor 1. The temperature sensor 14 can monitor the temperature inside the reactor 1 in real time to ensure that the reaction takes place at a suitable temperature.

[0024] The working principle of this invention is as follows: First, silicate waste liquid is added to the reactor 1 through the silicate waste liquid inlet 11. Then, the drive motor 21 is started, and the silicate waste liquid is stirred by the stirring device 2. At the same time, carbon dioxide gas is introduced into the reactor 1 through the carbon dioxide input device 3. The carbon dioxide gas is dispersed in the reactor 1 in the form of fine bubbles through the gas outlet on the dispersion plate 33. Under the action of the stirring device 2, the silicate waste liquid and carbon dioxide gas are fully mixed and reacted to generate silica precipitate. The water generated during the reaction is discharged through the drain outlet 12, and the generated silica precipitate and other possible impurities are discharged through the slag discharge outlet 13. The reaction temperature can be monitored in real time by the temperature sensor 14.

[0025] In summary, the reactor for preparing silica from chlorosilane waste gas provided by this invention, through the combined use of a stirring device and a carbon dioxide input device, achieves thorough mixing and reaction between silicate waste liquid and carbon dioxide gas, thereby improving the silica preparation efficiency. Furthermore, this reactor has a simple structure, is easy to operate and maintain, and has broad application prospects.

[0026] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model are within the protection scope of this utility model.

Claims

1. A reactor for preparing silica from chlorosilane waste gas, characterized in that: The device includes a reaction vessel, a stirring device, and a carbon dioxide input device. The reaction vessel has a silicate waste liquid inlet at its top. The carbon dioxide input device is connected to the reaction vessel and is used to introduce carbon dioxide gas into the reaction vessel. The stirring device is located in the reaction vessel and is used to stir the silicate waste liquid to promote mixing with the carbon dioxide gas. The carbon dioxide input device includes a carbon dioxide gas inlet, a gas delivery pipe, and a dispersion plate. The carbon dioxide gas inlet is located at the top of the reaction vessel, and the dispersion plate is located inside the reaction vessel at its bottom. The dispersion plate is connected to the carbon dioxide gas inlet through the gas delivery pipe, and the dispersion plate has multiple gas outlets densely distributed on it, through which carbon dioxide gas is dispersed in the reaction vessel.

2. The reactor for preparing silica from chlorosilane waste gas according to claim 1, characterized in that: The stirring device includes a drive motor, a reducer, a stirring shaft, and a blade assembly. The stirring shaft is arranged vertically in the reactor. The drive motor is located at the top of the reactor and is connected to the stirring shaft through the reducer. The blade assembly is arranged on the stirring shaft. The drive motor drives the blade assembly to rotate, thereby promoting the mixing of silicate waste liquid and carbon dioxide gas.

3. The reactor for preparing silica from chlorosilane waste gas according to claim 2, characterized in that: The impeller assembly includes a first impeller and a second impeller. The first impeller is disposed at the lower part of the stirring shaft, and the second impeller is disposed at the upper part of the stirring shaft. The first impeller is arranged vertically, and by rotating the first impeller, the vertically upward carbon dioxide gas flow is stirred and dispersed in the surrounding horizontal direction. The second impeller is arranged at an angle, and by rotating the second impeller, the dispersed gas-liquid mixture circulates up and down in the vertical direction.

4. The reactor for preparing silica from chlorosilane waste gas according to claim 3, characterized in that: The bottom of the reactor is equipped with a drain outlet and a slag outlet.

5. The reactor for preparing silica from chlorosilane waste gas according to claim 4, characterized in that: A temperature sensor for detecting the reaction temperature is installed on the side wall of the reactor.

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