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Coke breeze is the smallest size of coke, measuring less than 12 millimeters. Coke itself is the solid residue left after heating certain types of coal at high temperatures without air, primarily consisting of carbon with minor amounts of other elements and mineral matter from the original coal.1

Coke is crucial in metallurgy. Oven coke, typically 40 to 100 millimeters, is used in blast furnaces to produce iron. Larger, stronger foundry coke is used in cupolas for smelting iron ore. Smaller sizes of coke are used in manufacturing phosphorus and calcium carbide. Coke breeze, the smallest size, is specifically used for sintering iron ore before it goes into blast furnaces. Any excess coke breeze can serve as industrial boiler fuel.12

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