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Basic Knowledge of Ferroalloy Coke Ferroalloy coke is coke used in electric arc furnaces for the smelting of ferroalloys. Ferroalloy coke acts as a solid reducing agent in electric arc furnaces to participate in the reduction reaction, which primarily takes place in the high-temperature zone in the lower and middle parts of the furnace. Taking the production of ferroalloys through smelting as an example, the reaction equation is SiO2 (liquid) + 2C (solid) = Si (liquid) + 2CO (gas). As the reaction proceeds, the fixed carbon in the coke is continuously consumed and escapes from the top of the furnace mainly in the form of CO. Aluminum oxide, iron oxide, calcium oxide, magnesium oxide, and phosphorus pentoxide, among other components present in coke ash, are partially or fully reduced and incorporated into the alloy ； The portion that did not participate in the reaction goes into the slag. Sulfur and silicon in coke form silicides and disilicides before volatilizing. The requirements for coke quality vary depending on the type of ferroalloy being produced. The highest demands are placed on coke quality when manufacturing ferrosilicon alloy; therefore, coke suitable for producing ferrosilicon alloy generally meets the requirements for producing other ferroalloys as well. The requirements for coke in the production of ferrosilicon alloy are: a high fixed carbon content, low ash content, low levels of harmful substances such as aluminum oxide and phosphorus pentoxide in the ash, good reactivity of the coke, a high electrical resistivity, especially at high temperatures, low volatiles, appropriate strength and particle size, and low and stable moisture content. Chinese metallurgical standards (YB/T034-92) specify the technical requirements for ferroalloy coke, requiring particle sizes of 2–8 mm, 8–20 mm, and 8–25 mm. Other indicators are shown in the table