On June 16, in Helan Industrial Park, Yinchuan City, Ningxia, Geely's annual production of 100000 tons of physical polysilicon and photovoltaic industry chain project (Phase I) formally entered the construction stage.
This project is an important layout of Geely Energy Gathering in the field of new energy. The project adopts the physical purification method of polysilicon, which is the first technology in the world to successfully realize the large-scale industrialization of the physical method. It has the advantages of low energy consumption, high safety, low carbon footprint and green environmental protection. The unit energy consumption is only 40% of the traditional method, and the process technology has completely independent intellectual property rights, which will produce real green polysilicon.
According to the relevant person in charge of the project, in the future, Geely will rely on 100000 tons of polysilicon project to develop the downstream industries of polysilicon, such as crystal pulling, slicing, batteries and components , through the integration mode of "silicon energy industry chain + clean energy + energy storage". Build a "source-network-load-storage" integrated green photovoltaic industry chain zero-carbon park.
Data show that physical polysilicon technology is a new technology for polysilicon preparation. At present, the extraction of polysilicon mainly relies on a chemical method, that is, the reduction of silicon trichloride by hydrogen, but this process consumes a lot of electricity and raw materials, and produces harmful substances in the product.
Physical method, also known as metallurgical method, is similar to the process of metal smelting and purification. It refers to the method of preparing solar-grade polysilicon by using industrial silicon as raw material and combining hydrometallurgy, vacuum smelting, oxidation refining, directional solidification, special field smelting and other technologies. The
metallurgical method is characterized in that the silicon does not participate in any chemical reaction in the purification process, and the impurities are removed by a metallurgical smelting method depending on the difference of physical properties between the silicon and the impurities, so that the polycrystalline silicon meeting the performance requirements of the solar cell is obtained. The technology for preparing solar cell grade polycrystalline silicon by a
physical method has the advantages of low energy consumption, no pollution and high conversion rate. Experts say that the cost of polysilicon extracted by this method can be reduced by 1/4 to 1/3 compared with polysilicon of the same purity.
Source: Digital New Energy DNE
浙公网安备33010802003254号