Process for producing hydrochloric acid and silicon dioxide by washing polysilicon waste gas with water
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Our company is a manufacturer of high-purity polysilicon. The current method for treating waste gas involves neutralizing it with sodium hydroxide, thereby allowing the exhaust gases to be released in compliance with regulations. The salt-containing wastewater generated as a by-product is used to produce industrial salt. Could anyone provide information on a process that involves using water to wash polysilicon waste gas in order to produce hydrochloric acid and silicon dioxide? Or could you recommend a manufacturer that is already using this process?
The original poster has a really great idea. Is such a technique actually available? Water is used to wash the chlorosilane reaction to produce silica and hydrogen chloride; since silica is generated, I think the biggest challenge is dealing with the issue of blockages in the pipes and equipment. If there are similar manufacturing processes from other manufacturers, I would like to do the same.
The blockage may not be severe; the challenge lies in how to separate silica from the acid