Sustainable Mining and Metallurgy

Coal coking process produces a large amount of coke oven gas. The hydrogen content in coke oven gas is process 55%-60% (volume fraction). After purification, hydrogen can be widely used in the chemical industry. Hydrogen is one of the main raw materials for polysilicon production. Hydrogen is used in many places and in large quantities in the production of polysilicon. This paper mainly studied the feasibility of coke process by-product hydrogen after PSA deep purification for polysilicon production system. The experimental results show that the purity of hydrogen produced by the coke process after deep purification is stable above 5N, and does not contain organic impurity methane, which meets the requirements of polysilicon production for hydrogen quality. The content of polysilicon impurities produced by the coke process by-product hydrogen is mostly lower than that of the original hydrolysis hydrogen production. Although the content of C impurities fluctuates greatly, its average value meets the requirements of electronic grade 2 products. The production cost of polysilicon can be reduced by 270-360 yuan/t by using hydrogen produced by coal coking process instead of traditional electrolytic water to produce hydrogen.