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Polysilicon by-products should be effectively controlled
According to the current domestic technological level, producing 1 ton of polysilicon will produce 12 tons to 15 tons of silicon tetrachloride. According to statistics, in 2009 China's polysilicon production was about 20,000 tons, so its by-product silicon tetrachloride is Between 240,000 tons and 300,000 tons, and this output will increase with the gradual release of polysilicon production capacity.
Silicon tetrachloride is a raw material for the production of organic silicon, white carbon black and trichlorosilane. According to the overall design of a polysilicon company, the silicon tetrachloride, a by-product, must be converted into polysilicon main raw material trichlorosilane by a hydrogenation process. If not handled properly, it will cause environmental pollution. At present, most of the domestic polysilicon enterprises attach great importance to the comprehensive utilization of silicon tetrachloride. Most of the projects with a capacity of more than 1,000 tons are equipped with a silicon tetrachloride hydrogenation unit and hydrogen chloride and hydrogen recovery systems. The recovery of by-products is also generally above 95%.
Wang Yuelin, chairman of Guangzhou Jibisheng Technology Industrial Co., Ltd., said that fumed silica produced by using polysilicon industrial by-product silicon tetrachloride as a raw material is a nano-grade high-tech fine special chemical additive widely used in rubber, Plastics, coatings, adhesives, sealants and other polymer industries. The full use of silicon tetrachloride can reduce the production cost of polysilicon, achieve the purpose of energy saving, emission reduction, clean environmental protection and recycling of polysilicon production, further improve the technological level and market competitiveness of polysilicon production enterprises in China, and promote the rapid and healthy development of polysilicon industry in China. . At the same time, silicon tetrachloride can provide a large amount of raw materials for the fumed silica industry, thereby promoting the development of China's fumed silica industry, and further promoting the healthy development of China's solar energy and other high-tech and new materials. Therefore, the use of polysilicon by-products has become an important part of China's polysilicon industry in energy conservation, emission reduction, clean production, and sustainable development.
Strengthen cooperation in the production of white carbon black
Although some polysilicon systems in domestic companies have achieved full-closed-loop production, which greatly reduces production costs and increases production efficiency, there is still a certain gap compared with foreign companies, and high value-added products such as organic silicon products are produced using by-products. The technical aspects of high-grade fumed silica, quartz glass, calcium chloride, and sodium chloride are still not fully understood. Therefore, it is necessary to speed up technological research and development and seek a new mode of benign development that realizes the mutual utilization of resources, energy conservation and emission reduction, and mutual promotion.
Tang Chuanbin, general manager of Luoyang China Silicon High-Tech Co., Ltd., thinks that the way polysilicon companies cooperate with other companies in the processing of polysilicon byproducts is relatively good. First, polysilicon companies can use their own raw materials and public systems. Advantages: White carbon or silicone companies use their own expertise to complement each other and use it for their own purposes. The combination of polysilicon enterprises and silica or silicone companies can also facilitate polysilicon enterprises to achieve material recycling and reduce polysilicon production costs. 'Tang Chuanbin said.
Wang Yuelin also believes that from the requirements of the State Council's documents and actual operation, polysilicon companies with chemical power companies such as thermoelectricity, caustic soda, and fumed silica companies should have more advantages than their own complete organization. He analyzed the reasons for this. If polysilicon enterprises independently digest the silicon tetrachloride by-products by launching a fumed silica project, investment may not be a major problem. The problem is that technological breakthroughs need to be overcome. More importantly, it is necessary to form a completely independent relationship with polysilicon. The sales system, while the sales of fumed silica does not exceed 5% of the sales volume of polysilicon, so polysilicon companies will not attach too much importance, and their energy input will not be too great. It is obviously not easy to achieve good results. Finding professional companies to cooperate in such situations should be the best way.
He said that the most feasible method at present is to integrate polysilicon plants, chlor-alkali plants, and fumed silica plants to form a circular economy chain that utilizes each other's resources to realize resource recycling and truly achieve the purpose of energy conservation and emission reduction. The polysilicon plant and the fumed silica plant jointly use the hydrogen and chlorine gas in the chlor-alkali plant, while the silicon tetrachloride, a byproduct of the polysilicon plant, supplies the fumed silica plant as the main raw material for the preparation of fumed silica. The by-product hydrogen chloride produced in the production process of white carbon is recovered and returned to the chlor-alkali plant for the synthesis of trichlorosilane, and the trichlorosilane is supplied to the polysilicon plant, thereby realizing a circular economic chain of resource utilization.
Silicon tetrachloride treatment becomes the key to the healthy development of polysilicon industry
Business News Agency June 23th News Polysilicon is a key raw material for integrated circuits and photovoltaic power generation. With the rapid development of the photovoltaic industry in recent years, China's polysilicon production scale has rapidly expanded. In 2009, China’s polysilicon production reached 20,000 tons, with sales of nearly 9 billion yuan. It is expected that in 2010, demand will reach 50,000 tons and output will be 35,000 tons. Under this trend, the safety and environmental protection issues of silicon tetrachloride, a by-product produced during the production of polysilicon, have become increasingly prominent. How to treat silicon tetrachloride safely has become a key issue related to the healthy development of the polysilicon industry.