Production And Influence Of Sulfur in Petroleum Coke

Sulfur is one of the impurities that affects the quality of petroleum coke. The sulfur content of petroleum coke depends on the sulfur content of the residual oil. 30% to 40% of the sulfur in the residual oil remains in the petroleum coke. If the sulfur content is high The residual oil is hydrodesulfurized in advance to reduce the sulfur content in the residual oil, and the sulfur content of the petroleum coke obtained therefrom is correspondingly reduced. The sulfur in petroleum coke can be divided into two categories: organic compounds of sulfur (thioether, mercaptan, sulfonic acid, etc.) and inorganic compounds of sulfur (iron sulfide, sulfate). Generally, the desulfurization effect of calcining to about 1300 ℃ is not great. Only when the calcination temperature is increased to about 1450 ℃, can the desulfurization effect be more obvious. Part of the sulfide can be discharged at the high temperature of graphitization. For the production of anode materials for aluminum electrolysis and the production of graphite products, sulfur is a harmful element, and the graphite electrodes produced by petroleum coke with a large sulfur content will produce a "swelling" phenomenon during the graphitization process, which may easily lead to product cracks. When making steel with graphite electrodes with high sulfur content, the consumption of electrodes per ton of steel has increased. The sulfur content of petroleum coke in most production areas in China is low, only petroleum coke produced by refineries that use domestic high-sulfur crude oil or imported high-sulfur crude oil has higher sulfur content.