Polysilicon, as the main raw material for making solar cells, has developed tremendously in recent years. Whether it is the improved Siemens method or the silane method, there are a large number of filter separators for the collection of silicon powder, the recycling of chlorosilane, and the reuse of circulating water.
Pollutants and impurities:
1.Incompletely reacted silicon powder particles
2.Impurities in the pipeline brought by the circulating fluid
3.Solid dust and impurities brought in by the feed
4.Solid impurities generated by synthesis reaction
SP Solution:
1) High temperature exhaust gas purification
Exhaust gas filtration is applied in each process stage of polysilicon production, and plays an important role in the production of polysilicon. Especially during the current low operation period of the industry, it is very important to reduce the cost of polysilicon products.
a. Flue gas filtration of waste gas and liquid station
b. Separation of exhaust gas from reduction furnace
c. Separation of off-gas from hydrogenation furnace
d. Silica fume tank filtration, etc.
2) Reduction tail gas separation
After SiCl4 hydrogenation gas and SiHCl3 reduction gas are separated by dry method, H2 and HCl can be recycled. Before H2 is reused, the unreacted silicon powder and the graphite powder contained in the gas need to be filtered to ensure the purity of hydrogen and make the hydrogenation reaction and The reduction reaction is more stable and efficient.
SP Advantages:
Centralized treatment of waste gas and liquid, advanced technology and simple operation.
Good airtight performance, effective recovery of SiO2 powder.
Large processing capacity and high filtering precision.
