System and method for drying silicon powder and catalyst

A catalyst and silicon powder technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of long drying time, poor thermal conductivity and high energy consumption, and achieve the goal of improving drying efficiency, improving efficiency and saving energy consumption. Effect

Inactive Publication Date: 2013-12-25
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the drying of silicon powder and catalyst was conducted by indirect heating with inductance or steam jacket on the outer wall of the dryer to raise the internal temperature to the drying temperature. Due to the extremely poor thermal conductivity of silicon powder, the heating efficiency of these methods is low and slow, and Uneven temperature distribution, high energy consumption, long drying time, affecting normal production

Method used

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  • System and method for drying silicon powder and catalyst
  • System and method for drying silicon powder and catalyst
  • System and method for drying silicon powder and catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The silicon powder and the copper powder are added into the mixer according to the ratio of 50:1-200:1, and the silicon powder-copper catalyst mixture is obtained by mixing. The silicon powder-copper catalyst mixture obtained above is fed into the drying space of the dryer through the raw material feeding port which is connected with the mixer and arranged on the dryer body. Then the heated nitrogen gas is fed into the drying space of the dryer through the gas feeding port connected with the gas supply device and arranged on the body of the dryer. Utilize the resistance heating rod bushing that is arranged in the drier to provide heat to the silicon powder copper catalyst mixture that is in the dry space, the temperature of the dry space is controlled at 150 degrees Celsius, and the pressure of the dry space is adjusted to be 0.1 MPa, thereby to the silicon powder The copper catalyst mixture is dried to obtain a dry silicon powder copper catalyst mixture.

Embodiment 2

[0084] The silicon powder and the copper powder are added into the mixer according to the ratio of 50:1-200:1, and the silicon powder-copper catalyst mixture is obtained by mixing. The silicon powder-copper catalyst mixture obtained above is fed into the drying space of the dryer through the raw material feeding port which is connected with the mixer and arranged on the dryer body. Then the heated nitrogen gas is fed into the drying space of the dryer through the gas feeding port connected with the gas supply device and arranged on the body of the dryer. Utilize the resistance heating rod casing that is provided with in the drier to provide heat to the silicon powder copper catalyst mixture that is in the dry space, the temperature of the dry space is controlled at 450 degrees Celsius, and the pressure of the dry space is adjusted to be 0.5 MPa, thereby to the silicon powder The copper catalyst mixture is dried to obtain a dry silicon powder copper catalyst mixture. The above...

Embodiment 3

[0086] The silicon powder and the copper powder are added into the mixer according to the ratio of 50:1-200:1, and the silicon powder-copper catalyst mixture is obtained by mixing. The silicon powder-copper catalyst mixture obtained above is fed into the drying space of the dryer through the raw material feeding port which is connected with the mixer and arranged on the dryer body. Then the heated nitrogen gas is fed into the drying space of the dryer through the gas feeding port connected with the gas supply device and arranged on the body of the dryer. Utilize the resistance heating rod bushing that is arranged in the drier to provide heat to the silicon powder copper catalyst mixture that is in the dry space, the temperature of the dry space is controlled at 150 degrees Celsius, and the pressure of the dry space is adjusted to be 0.1 MPa, thereby to the silicon powder The copper catalyst mixture is dried to obtain a dry silicon powder copper catalyst mixture. The above-men...

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PUM

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Abstract

The invention provides a system and method for drying silicon powder and a catalyst. The system comprises a mixer, a dryer, and a gas supply device, wherein the dryer is connected with the mixer, and the gas supply device is connected with the dryer. The system is simple in structure, easy to operate and control, safe and stable to run, good in heat transfer effect, short in drying time, high in efficiency, quite low in reaction temperature and pressure, convenient in equipment maintenance, and quite low in energy consumption.

Description

technical field [0001] The invention relates to the field of polysilicon production, in particular to a system and method for drying silicon powder and catalyst. Background technique [0002] A large amount of silicon tetrachloride, a by-product produced in the polysilicon production process, will seriously pollute the environment if discharged directly. The existing treatment method is to convert silicon tetrachloride into trichlorosilane through cold hydrogenation. This method is to mix the powder catalyst and silicon powder uniformly in a certain proportion, and then change continuously from 20 degrees Celsius to 420 degrees Celsius in a gas atmosphere. Treat under certain temperature conditions; gas and silicon tetrachloride mixed gas in a certain ratio pass through the treated catalyst and silicon powder material layer to realize the cold hydrogenation reaction of silicon tetrachloride. Silicon powder and powdered catalyst need to be dried before entering the cold hydr...

Claims

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Application Information

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IPC IPC(8): C01B33/021C30B29/06C30B35/00
CPCY02P20/129
Inventor 张升学严大洲肖荣晖汤传斌杨永亮万烨
Owner CHINA ENFI ENGINEERING CORPORATION
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