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cement is made from a mixture of calcium carbonate (generally in the form of limestone), silica, iron oxide and alumina. a high-temperature kiln, often fuelled by coal, heats the raw materials to a partial melt at 1450degc, transforming them chemically and physically into a substance known as clinker
cement is made from a mixture of calcium carbonate (generally in the form of limestone), silica, iron oxide and alumina. a high-temperature kiln, often fuelled by coal, heats the raw materials to a partial melt at 1450degc, transforming them chemically and physically into a substance known as clinker...
https://www.worldcoal.org/coal/uses-coal/coal-cement