CCIN reporter learned from the meeting that at present China has an annual output of 100,000 tons of polysilicon production capacity, but in 2009 China's polysilicon production was only 18,000 to 19,000 tons. The mainstream technology of polysilicon production in China is to adopt the modified Siemens method. The key issue of this method is the large amount of byproduct silicon tetrachloride. For each ton of polysilicon produced, 15 tons of silicon tetrachloride will be produced. Byproduct silicon tetrachloride treatment is the industry's "big problem." Silicon tetrachloride is a toxic and hazardous liquid with strong corrosiveness. The environmental risk of disposal without treatment is very high. For this reason, polysilicon has also been put on a “highly polluted†hat. At the same time, if a large amount of silicon tetrachloride produced as a by-product cannot be resource-utilized, the production costs of polysilicon enterprises will be very high and they will be unable to compete with multinational companies. Many polysilicon companies that use traditional Siemens processes and improved Siemens processes are in a dilemma.
Shen Zuxiang, president of Chengdu Haoling Technology Development Co., Ltd., is recognized as the authority of China's polysilicon industry. He said at the meeting: “The production of polysilicon is actually a purification process from crude silicon to refined silicon. Many products such as silicon tetrachloride, trichlorosilane, and hydrochloric acid contained in the modified Siemens process are by-products. Recycling, polysilicon production is successful, so the stable and reliable polysilicon industrialization road is to realize the self recycling of materials and energy, that is, convert silicon tetrachloride into trichlorosilane and return it to the production system to produce polysilicon. A better resource utilization route."
At present, Chen Xiyi, chief engineer of Jiangxi LDK PV Silicon High-Tech Co., Ltd., one of the major polysilicon producers in China, believes that the use of silicon tetrachloride can explore a variety of ways of utilization. The direct use of silicon tetrachloride hydrotreating for the production of polysilicon is a road and has progressed rapidly in recent years, but the conversion efficiency of hydrogenation is still unsatisfactory and needs improvement. The use of silicon tetrachloride for the production of fumed silica, ethyl silicate and fiber grade silicon tetrachloride is also a good route, but its market capacity is limited and it is impossible to digest a large amount of silicon tetrachloride. In addition, silicon tetrachloride can also be used as a raw material for the production of silicone products. In this regard, the technology still needs a breakthrough.
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