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Metallurgical coke is a general term for blast furnace coke, foundry coke, main coke coal, ferroalloy coke and non-ferrous metal smelting coke. Since more than 90% of metallurgical coke is used in blast furnace ironmaking, blast furnace coke is often called metallurgical coke. The quality standard of metallurgical coke (GB/T1996-94) formulated by China is the quality standard of blast furnace.
Gasified coke is a kind of coke specially used for producing gas. It is mainly used in fixed bed gas generator with solid slag discharge as gasification raw material to produce gas with CO and H2 as combustible components. The main reactions of gasification process are: C+O_2_CO_2+408177KJ CO_2+C_2CO-162142KJ C+H_2_CO+H_2-118628KJ C+2H_2_CO_2+2H_2-75115KJ. Because the process of producing CO and H_2 is endothermic reaction, the required heat is provided by the oxidation and combustion of coke, so the gasification coke is also the heat source of gasification process. Gasification coke requires low ash content, high ash melting point, proper size and uniformity. The General requirements are as follows: fixed carbon > 80%, ash 1250 C, volatile matter < 3.0%, particle size 15-35 mm and 35 mm. Although metallurgical coke can be used as gasification coke, metallurgical coke is generally not used to produce gas because of the limitation of main coking coal resources and price. Gas-coal coke and lean coke coal produced from high volatile binder coal are not suitable for blast furnace smelting because of their small size and low strength, but their gasification reactivity is good, and they can replace gasified coke for gas making. Calcium carbide coke is the coke used as conductor and heater in electric arc furnace for calcium carbide production. Calcium carbide is added into electric arc furnace with coke. Under the action of high temperature of arc heat and resistance heat (1800-2200 C), complex reaction occurs with lime to produce calcium carbide in melting state. The formation process can be expressed by the following reactions: CaO+3C_CaC2+CO-46.52KL。
Basic knowledge of carbide coke:
Calcium carbide coke is used as conductor and heating coke in electric arc furnace for calcium carbide production. Calcium carbide is produced by adding coke into electric arc furnace under the action of arc heat and resistance heat (1800-2200 C), which reacts with limestone in a complex way to form calcium carbide in a melting state. The formation process can be expressed as follows: CaO+3C_CaC2+CO-46.52KJ calcium carbide coke should have the characteristics of low ash content, high reactivity, high resistivity and moderate particle size, as well as remove powder and reduce moisture as far as possible. Its chemical composition and particle size should generally meet the following requirements: fixed carbon greater than 84%, ash less than 14%, volatile less than 2%, sulfur less than 1.5%, phosphorus less than 0.04%, moisture less than 1.0%. The particle size depends on the capacity of electric arc furnace for producing calcium carbide: furnace capacity/KV? A particle size/mm < 50003-125000-100003-1510000-200003. - 18 > 20 000 3-20 particle size eligibility rate requires more than 90%.