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Petroleum coke is a black or dark gray hard solid petroleum product with metallic luster and porosity. It is a granular, columnar or acicular carbon body formed by the crystallization of tiny graphite. Petroleum coke is composed of hydrocarbons, containing 90-97% carbon, 1.5-8% hydrogen, nitrogen, chlorine, sulfur and heavy metal compounds.
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Petroleum coke is a by-product of pyrolysis of raw oil in delayed coking plant at high temperature to produce light oil products. The production of petroleum coke is about 25-30% of the raw oil. Its low calorific value is about 1.5-2 times that of coal, ash content is not more than 0.5%, volatile content is about 11%, the quality is close to anthracite coal.
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Delayed petroleum coke refers to the coke produced by delayed coking unit, also known as ordinary coke, there is no corresponding national standard. At present, domestic production enterprises mainly produce according to the industry standard sh0527-92 formulated by the former sinopec corporation (see the attached table for details). This standard is mainly based on the classification of petroleum coke sulfur content, including grade I products,
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No. 1 coke is suitable for making common power graphite electrode in steelmaking industry, and is also suitable for aluminum smelting as carbon for aluminum. No.2 coke is used as the electrode paste and production electrode for electrolytic cell (furnace) in aluminum smelting industry, no.3 coke is used for the production of silicon carbide (abrasive material) and calcium carbide (calcium carbide), as well as other carbon products. It is also used for the production of anode bottom block for aluminum smelting electrolytic cell and for the construction of carbon lining brick or furnace bottom of blast furnace. The main USES of petroleum coke are pre-baked anode and anode paste used in electrolytic aluminum, carbon industry production of carbonizing agent, graphite electrode, smelting industry silicon and fuel.
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Needle coke, with obvious needle-like structure and fiber texture, is mainly used as high-power and ultra-high-power graphite electrode in steelmaking. Due to the strict quality index requirements of needle coke in sulfur content, ash content, volatile matter and true density, there are special requirements for the production process and raw materials of needle coke.
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Sponge coke, with high chemical reactivity and low impurity content, is mainly used in aluminum smelting industry and carbon industry. Pellet coke or spherical coke: round shape, diameter 0.6-30mm, is generally produced by high sulfur, high asphaltene residue, can only be used for power generation, cement and other industrial fuels. Pulverized coke: it is produced by fluidized coking process, with fine particles (0.1-0.4mm in diameter), high volatile matter, high thermal expansion coefficient, and cannot be directly used in electrode preparation and carbon industry.
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According to the different sulfur content, can be divided into high sulfur coke (sulfur content of more than 3%) and low sulfur coke (sulfur content of less than 3%). Low sulfur coke can be used as anode paste and prebaked anode for aluminum plant and graphite electrode for steel plant. High quality low sulfur coke (less than 0.5% sulfur content) can be used to produce graphite electrode and carbonizing agent. Low sulfur coke of general quality (sulphur content less than 1.5%) is often used in the production of prebaked anodes. The low quality petroleum coke is mainly used in smelting industry silicon and producing anode paste. High-sulfur coke is commonly used as fuel for cement plants and power plants.
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Calcined Petroleum Coke: Calcined Petroleum Coke must be Calcined in order to adapt to the requirements of graphite electrode for steel making or anode paste (melting electrode) for aluminum and magnesium making. Usually in the calcining temperature of 1300 ℃ or so, the purpose is to volatile petroleum coke to remove as much as possible. In this way, the hydrogen content of petroleum coke reproducts can be reduced, and the degree of graphitization of petroleum coke can be improved, so that the high temperature strength and heat resistance of graphite electrode can be improved, and the conductivity of graphite electrode can be improved.
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Calcining is mainly used to produce graphite electrode, carbon paste products, emery sand, food grade phosphorus industry, metallurgical industry and calcium carbide industry, among which graphite electrode is the most widely used. The coke can be directly used for calcium carbide as calcium carbide main material and silicon carbide and boron carbide as abrasive material without forging burning. It can also be directly used as coke for blast furnace of metallurgical industry or carbon brick lining blast furnace wall, or as dense coke for casting process.
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