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Method for recycling disposal of silicon tetrachloride slag slurry produced in polycrystalline silicon production and device thereof

一种处置方法、四氯化硅的技术，应用在氧化硅、二氧化硅、卤化硅化合物等方向，能够解决石灰乳或碱液消耗大、水用量大、四氯化硅利用低等问题，达到高换热系数的效果

Active Publication Date: 2015-03-25
TIANHUA INST OF CHEM MACHINERY & AUTOMATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment not only consumes a lot of water, but also consumes a lot of lime milk or lye to neutralize the hydrolyzate
The silicon dioxide collected by this method also contains certain impurities, and the utilization of silicon tetrachloride is very low.

Method used

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  • Method for recycling disposal of silicon tetrachloride slag slurry produced in polycrystalline silicon production and device thereof
  • Method for recycling disposal of silicon tetrachloride slag slurry produced in polycrystalline silicon production and device thereof

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Embodiment Construction

[0051] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings:

[0052] A method for recovering and disposing of silicon tetrachloride slag is characterized in that:

[0053] The liquid mainly composed of chlorosilane (which still contains trichlorosilane, silicon powder, aluminum ions and other substances) from the upstream section first continuously enters the paddle dryer 1 (produced by Lanzhou Ruide Drying Technology Co., Ltd., patent number: 200820170768.X), through the indirect heating and evaporation of paddle dryer 1, the steam trap 4 is used to separate the steam-water mixture after heat exchange and condensation from the heat shaft of paddle dryer 1 and the jacket, so as to ensure the saturated water condensed in the dryer The steam is discharged in time; the volatile content of the slurry exiting the dryer is controlled at 20% to 50%, and it flows through the bellows 3 and enters the screw pump 2...

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Abstract

A device for recovering SiCl4 slurry and method for the same, comprising a paddle dryer for receiving SiCl4 slurry containing chlorosilane; a first spray scrubber for receiving exhaust gas from the paddle dryer; a condenser for condensing and recovering the purifying exhaust gas from the first spray scrubber and discharging supersaturated vapor that after condensation and separation; a defogging separator for removing liquid droplets from supersaturated vapor which is cooled by the condenser; a hydrolysis tank for receiving and hydrolyzing a paste-like slurry from the paddle dryer and vapor from the defogging separator to produce mixture and exhaust gas; a drum pressure filter for receiving neutralization products from a neutralization stirring tank.

Description

technical field [0001] The present invention relates to the technical field of polysilicon production, specifically polysilicon intermediate product——SiCl 4 A recovery and disposal method of slurry and its device are also applicable to the disposal of other similar materials. Background technique [0002] Characteristics of silicon tetrachloride slurry: [0003] 1. Silicon tetrachloride (molecular formula: SiCl 4 English name: silicon tetrachloride (industrial abbreviation: STC) - is a colorless or light yellow transparent fuming liquid with a suffocating smell. The main material of resin, silicone rubber, etc. In industry, it is mainly obtained by reacting ferrosilicon with chlorine gas at a temperature above 200°C and distilling it. [0004] 2. Silicon tetrachloride can be hydrolyzed in humid air to form silicic acid and hydrogen chloride, and white smoke will be generated at the same time. Severely irritating to eyes and upper respiratory tract, high concentration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/107
CPCC01B33/12C01B33/18Y02P20/10
Inventor 赵旭郭辉张万尧王瑞
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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