After the article was published, many experts expressed their opinions on how to use silicon tetrachloride as a byproduct of the polysilicon industry in China. Among them, Professor Zhu Lihui, Secretary-General of China Semiconductor Materials Association’s Semiconducting Materials Branch, is full of confidence in the prospect of comprehensive utilization of silicon tetrachloride.
Professor Zhu introduced that foreign companies attach great importance to the comprehensive utilization of polysilicon byproducts. Such as Germany's Wacker company to achieve a fully closed cycle of production, the company's silicon material production sales in the past few years about more than 3 billion euros, of which 1 billion euros is a result of deep processing of polysilicon by-products, truly turn waste into treasure, Comprehensive utilization. In addition to hydrogenation of silicon tetrachloride into trichlorosilane recycling into polysilicon production, but also can be made of gas phase white carbon black, ethyl silicate, silicone and other products.
Prof. Zhu said that a feasible method for domestic use of silicon tetrachloride is to return silicon tetrachloride to a nearby chemical company that synthesizes trichlorosilane and reuse it. After hydrogenation, it will be provided as trichlorosilane. Polysilicon plant as raw material. The most suitable for this requirement is the chlor-alkali plant. However, the key technology that must be addressed is to reduce the energy consumption of hydrogenation of silicon tetrachloride because the cost of hydrogenation of silicon tetrachloride to trichlorosilane using present technology is higher than the cost of direct synthesis of trichlorosilane, resulting in This technology is difficult to apply industrially. Therefore, the polysilicon plant, the chlor-alkali plant, and the fumed silica plant can be brought together to form a circular economy chain where resources can be used to achieve resource recycling and energy conservation and emission reduction.
Professor Zhu said that there are many chlor-alkali enterprises in the chemical industry in China, and almost every province and city has several domestic gas-phase carbon black factories. However, there are very few companies that have mastered related technologies. Prof. Zhu suggested that the relevant local governments should coordinate and coordinate. In the future, when establishing or expanding polysilicon production projects, they should first be tied together with the nearby chlor-alkali enterprises, and at the same time, they should combine gas-phase silica production companies to solve the by-products of polysilicon enterprises. Problems will eventually lead to the recycling of resources and form a healthy and coordinated industrial chain.
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