Looking for advice from experts in the polysilicon industry
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Experts, please help. My brother is engaged in anti-corrosion equipment and would like to know more about the polycrystalline silicon industry. There are a few questions now: one: Whether highly corrosive media such as hydrochloric acid and hydrofluoric acid are used in the polysilicon industry, and if so, how much is used in a 1000T/A project, what materials are used in most of the storage tanks involved, and what is the storage capacity of the equipment used. And which process link does it exist in? two: I heard that there are extremely corrosive gases in exhaust gas recovery, so what materials are the main materials used for the tower equipment used in the later exhaust gas recovery system? If there is a elution tower, is this equipment a normal pressure equipment? I hope experts can give me some guidance. I don’t know much about this industry and I only read some information on the Internet. Therefore, it is inappropriate to ask the above two questions. I hope you experts will not laugh so hard!
The tank is basically made of FRP and is not very corrosive. It contains a lot of HCL but no water, so it is not very corrosive. Generally used stainless steel.
You must use hydrochloric acid and hydrofluoric acid, which are generally used for post-processing and corrosion.
We generally use 316L stainless steel storage tanks and pipes, which the polysilicon design unit will consider.
Thanks for the reply. Can you tell me who are the design units for polysilicon? Are the 316L storage tanks and pipelines in use at normal temperature and pressure?
Thanks for replying. Are FRP material storage tanks widely used in the polysilicon industry?
Do storage tanks also use 316L? Have money? What is the use of 316L? Q235 is enough, usually 16MnR, up to 304. Chlorosilane is anhydrous and has no corrosion.
Theoretically, chlorosilane is anhydrous, but when it is first started, the system is unstable and requires a lot of maintenance. After repairs, tests must be carried out, so it is inevitable that a small amount of moisture will not appear. Furthermore, the advantage of using stainless steel is that the cost of cleaning in the future will be reduced, and the corresponding iron elements and other impurities in the products will be less, which will ensure the quality of the product.