A device for improving the recovery rate of chlorosilane in slag slurry

Abstract

The utility model provides a device of improving the recovery rate of chlorosilane in slag slurry relates to slag slurry processing technical field, the utility model discloses a material tank, the feed pipe is communicated with material tank, stabilizer material tank is communicated with material tank, stabilizer feed bin is communicated with stabilizer material tank, wherein, the pipeline between stabilizer feed bin and stabilizer material tank and the pipeline between stabilizer material tank and material tank all are equipped with valve, stabilizer feed bin is equipped with sodium chloride in, be equipped with replacement pipeline on stabilizer material tank. The utility model makes the operation temperature of evaporation machine to improve and reduce the risk of heat exchange tube blockage caused by aluminium chloride sublimation, reduce chlorosilane loss, improve recovery rate significantly.

Description

Technical Field

[0001] This utility model relates to the field of slurry treatment technology, specifically to a device for improving the recovery rate of chlorosilanes in slurry. Background Technology

[0002] The slurry produced in the cold hydrogen chemical process contains a large amount of chlorosilanes. If it is dumped or buried without proper treatment, it will cause serious damage to the ecological environment. This slurry mainly comes from the cold hydrogen chemical process and its main components are silicon powder and chlorosilanes. Silicon powder accounts for 20%, chlorosilanes account for 79.5% (including silicon tetrachloride, trichlorosilane, high-boiling substances, etc.), and the remaining 0.5% consists of impurities such as metal chlorides.

[0003] Currently, the drying-vaporization concentration process is commonly used in China for solid-liquid separation of slurry. During this stage, metal chlorides, such as aluminum chloride, have low melting points (approximately 192°C) and are prone to sublimation (sublimation temperature approximately 180°C). After sublimation, the aluminum chloride gas enters the cooler and condenses due to the temperature drop, forming solid particles that adhere to the heat exchanger surface, causing equipment blockage. To avoid this problem, existing processes typically control the temperature during the drying-vaporization concentration stage at a low range. However, this also leads to the loss of some chlorosilanes due to incomplete evaporation, affecting recovery efficiency. Utility Model Content

[0004] The purpose of this invention is to develop a device that improves the recovery rate of chlorosilanes in slurry by increasing the operating temperature of the evaporator, reducing the risk of heat exchange tube blockage caused by aluminum chloride sublimation, reducing chlorosilane loss, and significantly improving the recovery rate.

[0005] This utility model is achieved through the following technical solution:

[0006] An apparatus for improving the recovery rate of chlorosilanes in slurry, comprising:

[0007] Material tank;

[0008] The feed pipe is connected to the material tank;

[0009] Stabilizer tank, connected to the material tank;

[0010] Stabilizer feeding silo, connected to stabilizer tank;

[0011] Valves are provided on the pipeline between the stabilizer feeding silo and the stabilizer tank, as well as on the pipeline between the stabilizer tank and the material tank. The stabilizer feeding silo contains sodium chloride, and the stabilizer tank is equipped with a displacement pipeline.

[0012] Optionally, the replacement pipeline includes an air inlet pipeline and an exhaust pipeline connected to the stabilizer tank.

[0013] Optionally, the air intake pipeline includes a main air intake pipe, which is connected to multiple branch air intake pipes. Each branch air intake pipe is connected to the stabilizer tank and is equipped with a valve.

[0014] Optionally, a pump is provided on the main air intake pipe, and a pressure gauge is provided on the stabilizer tank.

[0015] Optionally, the main air intake pipe is connected to three air intake branch pipes, which are respectively connected to the top and bottom of the stabilizer tank and the pipeline between the stabilizer tank and the material tank.

[0016] Optionally, the exhaust pipeline includes a main exhaust pipe, which is connected to multiple exhaust branch pipes. The exhaust branch pipes are connected to a stabilizer tank and are equipped with valves.

[0017] Optionally, the material tank is equipped with a stirring mechanism.

[0018] The beneficial effects of this utility model are:

[0019] This invention adds sodium chloride as a stabilizer to the slurry, which effectively changes the influence of the dryer operating temperature on the phase change parameters (melting point, boiling point, sublimation temperature) of aluminum chloride, increases the sublimation temperature of aluminum chloride, and improves the operating temperature of the evaporator. This improvement can reduce the risk of heat exchange tube blockage caused by aluminum chloride sublimation, reduce the loss of chlorosilane, significantly improve the recovery rate, and achieve improved economic benefits. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural diagram of the present utility model.

[0022] Attached reference numerals: 1. Material tank; 2. Mixing mechanism; 3. Feed pipe; 4. Stabilizer feeding silo; 5. Stabilizer tank; 6. Exhaust pipe; 7. Air inlet pipe. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] like Figure 1 As shown, this utility model discloses a device for improving the recovery rate of chlorosilanes in slurry, including a stabilizer feeding bin 4, a stabilizer tank 5, and a material tank 1 connected by sequential pipelines. Valves are provided on the pipelines between the stabilizer feeding bin 4 and the stabilizer tank 5, as well as on the pipelines between the stabilizer tank 5 and the material tank 1. The stabilizer feeding bin 4 contains sodium chloride as a stabilizer.

[0027] The stabilizer tank 5 is equipped with a pressure gauge and is connected to a displacement pipeline. Sodium chloride in the stabilizer feeding bin 4 falls into the stabilizer tank 5 through the pipeline, and the air entering the stabilizer tank 5 due to the feeding is replaced through the displacement pipeline.

[0028] The replacement pipeline includes an inlet pipeline 7 and an exhaust pipeline 6 connected to the stabilizer tank 5. The inlet pipeline 7 supplies nitrogen to the stabilizer tank 5, and the nitrogen entering the stabilizer tank 5 is output through the exhaust pipeline 6 along with the air.

[0029] The air intake pipeline 7 includes a main air intake pipe, which is equipped with a pump. The main air intake pipe is connected to three branch air intake pipes, which are respectively connected to the top and bottom of the stabilizer tank 5 and the pipeline between the stabilizer tank 5 and the material tank 1. Each of the three branch air intake pipes is equipped with a valve.

[0030] The exhaust pipe 6 includes a main exhaust pipe, which is connected to two exhaust branch pipes. Both exhaust branch pipes are connected to the top of the stabilizer tank 5, and both exhaust branch pipes are equipped with valves.

[0031] The top of the material tank 1 is connected to the feed pipe 3, and the material tank 1 is equipped with a stirring mechanism 2.

[0032] After sodium chloride enters the stabilizer tank 5, the valves on the pipelines between the stabilizer tank 5, the stabilizer feeding hopper 4, and the material tank 1 are closed, the replacement pipeline is used for replacement, the air inlet pipeline 7 pumps nitrogen into the stabilizer tank 5, and the gas in the stabilizer tank 5 is discharged through the exhaust pipeline 6.

[0033] After the replacement is completed in the stabilizer tank 5, the valve on the exhaust pipe 6 is closed, and the stabilizer tank 5 is pressurized by the pump so that the pressure in the stabilizer tank 5 is greater than that in the material tank 1. Then the valve on the pipeline between the stabilizer tank 5 and the material tank 1 is opened, allowing sodium chloride to enter the material tank 1. The sodium chloride is mixed with the slurry by the stirring mechanism 2, and then the slurry is further processed.

[0034] This invention adds sodium chloride as a stabilizer to the slurry, which effectively changes the influence of the dryer operating temperature on the phase change parameters (melting point, boiling point, sublimation temperature) of aluminum chloride, increases the sublimation temperature of aluminum chloride, and improves the operating temperature of the evaporator. This improvement can reduce the risk of heat exchange tube blockage caused by aluminum chloride sublimation, reduce the loss of chlorosilane, significantly improve the recovery rate, and achieve improved economic benefits.

[0035] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. An apparatus for improving the recovery rate of chlorosilanes in slurry, characterized in that, include: Material tank; The feed pipe is connected to the material tank; Stabilizer tank, connected to the material tank; Stabilizer feeding silo, connected to stabilizer tank; Valves are provided on the pipeline between the stabilizer feeding silo and the stabilizer tank, as well as on the pipeline between the stabilizer tank and the material tank. The stabilizer feeding silo contains sodium chloride, and the stabilizer tank is equipped with a displacement pipeline.

2. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 1, characterized in that, The replacement pipeline includes an inlet pipeline and an exhaust pipeline connected to the stabilizer tank.

3. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 2, characterized in that, The air intake pipeline includes a main air intake pipe, which is connected to multiple branch air intake pipes. Each branch air intake pipe is connected to the stabilizer tank and is equipped with a valve.

4. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 3, characterized in that, The main air intake pipe is equipped with a pump, and the stabilizer tank is equipped with a pressure gauge.

5. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 3, characterized in that, The main air intake pipe is connected to three air intake branch pipes, which are respectively connected to the top and bottom of the stabilizer tank and the pipeline between the stabilizer tank and the material tank.

6. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 2, characterized in that, The exhaust pipeline includes a main exhaust pipe, which is connected to multiple exhaust branch pipes. The exhaust branch pipes are connected to a stabilizer tank and are equipped with valves.

7. The apparatus for improving the recovery rate of chlorosilanes in slurry according to claim 1, characterized in that, The material tank is equipped with a stirring mechanism.

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