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Method for treating chlorosilane slurry residual liquid

A technology of chlorosilane and slurry, which is applied in the direction of halosilane, chemical instruments and methods, silicon compounds, etc., can solve the problems of no metal and copper recovery reports, achieve convenient recovery, reduce production costs, reduce lye and The effect of water resources

Inactive Publication Date: 2018-01-26
四川绿源聚能环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0047] So far, there is no report on the recovery of copper metal from chlorosilane slag slurry

Method used

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  • Method for treating chlorosilane slurry residual liquid
  • Method for treating chlorosilane slurry residual liquid
  • Method for treating chlorosilane slurry residual liquid

Examples

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Embodiment 1

[0090] The chlorosilane slurry raffinate treated here is taken from a cold hydrogenation unit in a certain polysilicon production, and its main components are shown in Table 1:

[0091] Table 1 Composition of slurry raffinate

[0092] main ingredient

Mass fraction (wt)%

Silicon tetrachloride

83.31％

polysilane

0.13％

Trichlorosilane

3.85％

Dichlorodihydrosilane

0.13％

Other metal chlorides

3.56％

Phosphorus trichloride

2.31％

Methyldichlorosilane

0.01％

hydrogen chloride

0.00％

Silica fume

3.18％

Cuprous chloride

1.54％

[0093] Take 10,000g of chlorosilane slurry residue and transport it to the preliminary recovery step I as shown in the accompanying drawing. After standing for a period of time, the solids will settle at the bottom of the container, and the upper layer is a chlorosilane solution with a lower solid content. After the upper layer solution is separated, it...

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Abstract

The invention provides a method for retrieving silicon tetrachloride, silicon powder and copper or / and preparing silicate ester by treating chlorosilane slurry residual liquid. The method comprises the following steps: separating chlorosilane slurry residual liquid through solid-liquid separation in step I; directly feeding a liquid phase into a silicon tetrachloride storage tank or purifying silicon tetrachloride in a step III; reacting the solid phase in the step II to lead residual chlorosilane to react and generate silicate ester and hydrogen chloride, and dissolving other chlorides in anorganic solvent; distilling and reclaiming silicate ester from the reacting liquid phase in the step IV, returning the reclaimed hydroxyl-containing solvent and stabilizer to step II for recycling, hydrolyzing and neutralizing kettle bottom solution in the step V; and adding an alkaline liquor, reacting metal chloride to generate hydroxide precipitate, directly removing the Three Wastes from the neutralized reacting liquid phase in the step VII, extracting copper from the hydroxide precipitate through the step VI, and further treating in the step VIII to obtain metal copper; and treating the solid, which is copper-containing silicon powder, obtained in the step II to reclaim silicon powder and copper after step VI and step VIII treatment.

Description

technical field [0001] The invention relates to a method for recovering chlorosilane, silicon powder and copper in chlorosilane slag residue, in which part of silicon tetrachloride (hereinafter referred to as STC) is recovered and prepared into silicate during the recovery process. The invention aims to recycle chlorosilane, silicon powder and copper in the chlorosilane slag residue with high efficiency and high quality, avoid chlorine and copper elements from being discharged into the environment and affect water quality, soil and air, and meet the national energy saving and emission reduction requirements . The method described in the present invention can not only realize that chlorosilane, silicon powder and copper are almost completely recovered, but also can freely determine the amount of direct recovery of silicon tetrachloride and how much STC is used for while fully recovering silicon powder and copper in the waste. Synthetic silicate can obtain various valuable prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107C01B33/037C01B7/03C07F7/04
Inventor 吴梅吴娟
Owner 四川绿源聚能环保科技有限责任公司
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