Device system for treating chlorosilane slag slurry raffinate

Abstract

The invention provides a device system for treating chlorosilane slag slurry raffinate to recycle silicon tetrachloride, silicon powder, copper or / and preparing silicate ester. The chlorosilane slag slurry raffinate is added into a solid-liquid separation device I; after separation, a liquid phase directly flows into a silicon tetrachloride storage tank or a silicon tetrachloride purification device III, and a solid phase is discharged into a reaction device II, so that residual chlorosilane and an organic solvent react to generate the silicate ester and hydrogen chloride, and other chloridesare dissolved into the organic solvent; after the solid-liquid separation, the liquid phase is distilled by a device IV, so that the silicate ester is separated out; an extracted material at the top of a tower returns into the reaction device II, and kettle base solution flows into a hydrolysis and neutralization device V; alkali liquor is added into the device V and is in reaction with the metalchlorides to generate a hydroxide precipitate and chlorate solution, a liquid phase flows into a three wastes treatment device VII, a solid phase is transferred to a copper extraction device VI for copper extraction, and copper is further treated by a device VIII, so as to obtain recovery copper; a solid phase in the device II is copper-contained silicon powder and is treated by the device VI andthe device VIII, so as to recovery silicon powder and copper.

Description

technical field [0001] The invention relates to a device system for recovering chlorosilane, silicon powder and copper in chlorosilane slag raffinate. During the recovery process, part of silicon tetrachloride (hereinafter referred to as STC) is recovered and prepared into silicate. 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 device system 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. Synthesizing silicate is to reduce the cost...

AI Technical Summary

Problems solved by technology

[0046] So far, there is no report on the recovery of copper metal from chlorosilane slag slurry

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