Petroleum coke is a black or dark gray hard solid petroleum product with a metallic luster and a porous appearance. It is a carbon body composed of tiny graphite crystals in the form of granular, columnar or needle-shaped. Petroleum coke components are hydrocarbons, containing 90-97% carbon, 1.5-8% hydrogen, and nitrogen, chlorine, sulfur and heavy metal compounds.
According to the structure and appearance of petroleum coke, petroleum coke products can be divided into four types: needle coke, sponge coke, shot coke and powder coke:
(1) Needle coke, with obvious needle-like structure and fiber texture, is mainly used as high-power and ultra-high-power graphite electrodes in steelmaking. Since needle coke has strict quality index requirements in terms of sulfur content, ash content, volatile matter and true density, there are special requirements for the production process and raw materials of needle coke.
(2) Sponge coke, with high chemical reactivity and low impurity content, is mainly used in aluminum smelting industry and carbon industry.
(3) Shot coke or spherical coke: spherical in shape and 0.6-30mm in diameter, generally produced from high-sulfur and high-asphaltene residual oil, and can only be used as industrial fuels such as power generation and cement.
(4) Powder coke: produced by fluidized coking process, its particles are fine (diameter 0.1-0.4mm), high volatile matter, high coefficient of thermal expansion, and cannot be directly used in electrode preparation and carbon industry.
According to the different sulfur content, it can be divided into high sulfur coke (sulfur content above 3%) and low sulfur coke (sulfur content below 3%). Low sulfur coke can be used as anode paste and prebaked anodes for aluminum plants and graphite electrodes for steel plants. Among them, high-quality low-sulfur coke (with a sulfur content less than 0.5%) can be used to produce graphite electrodes and recarburizers. Normal quality low-sulfur coke (less than 1.5% sulfur) is often used to produce prebaked anodes. Low-quality petroleum coke is mainly used for smelting industrial silicon and producing anode paste. High sulfur coke is generally used as fuel in cement plants and power plants.
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Fever L.//SMC Editor