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The organic silicon, polysilicon and silane gas industries have always suffered from serious environmental pollution, high energy consumption, and backward technology and industrialization, which have greatly restricted the sustainable development of the silicon industry, and pollution problems have been repeatedly put on the agenda. A large number of gas phase products and solid particles are produced in the production process of the silicon industry. Due to the poor precision, temperature resistance and mechanical properties of some conventional separation equipment, the requirements for high temperature gas-solid separation cannot be satisfied, and the gas phase products entering the subsequent stage are still entrained a large amount of solid particles. The gas phase product needs to be condensed and liquefied, and then concentrated into the rectification column for separation. The enrichment of the condensate will generate a lot of slurry (the main components are chlorosilane and silicon powder, etc.), and the slurry is the most difficult contaminants to treat. In the past period of time, a large amount of slurry was treated by simple burial or even direct dumping. The consequences of this directly caused serious pollution accidents, land was not produced, and water resources were seriously damaged.
With the advancement of technology, people have adopted new processes to treat slurry and have achieved certain results. Up to now, domestic slurry treatment processes include alkaline hydrolysis, drying, and pressure filtration. However, there are a series of difficulties in the processing of the slurry, mainly reflected in the following five points:
1. Large amount of slurry treatment, high equipment, labor and energy costs
2. The chlorosilane is wasted seriously
3. The risk factor is large, which brings great disadvantage to safe operation.
4. Waste of water resources is serious
5. Wastewater treatment
For the high-temperature gas-solid separation problem in fluidized bed reactors in the fields of silicone, polysilicon, silane gas, etc., Shinkai uses self-produced sintered metal film as the filtering element to develop a high-temperature gas-solid filter separation system for high temperature and high risk. Complete separation of gas phase products from solid particles under ambient conditions. Its outstanding advantages can greatly reduce the processing capacity of subsequent processes, reduce the waste of water resources, and effectively reduce the pressure of safety and environmental protection, which has been widely praised by users.
● Sintered metal filter elements
● Hot gas filter
● Product filter
● Automatic backwash filter
● A-B parallel switching filter
● Good filtering precision (0.5μm to 10μm)
● Reduce the risk of safety and environmental protection
● Shape stability, components with high strength (sufficient pressure strength up to 50bar)
● Corrosion resistance
● Defined permeability and particle retention
● Good back flushing performance
● Silicon powder filtration
● Catalyst filtration filtration
● Product purification filtration
● Air delivery filtration
● Hot gas filtration
● Exhaust emission filtration