生产焦炭的焦煤(coking coal),也称作冶金煤,属于烟煤或次烟煤。或用多种煤炭配比混合后炼焦。焦煤在炼焦炉中隔绝氧气经过1,000°C干馏后,可挥发成分已经去除,剩余的固态物质即焦炭。由于炼铁需要尽可能少的硫、磷雜質,所以应选择低硫低磷的焦煤。
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国际上一般把焦煤分为六种:
中国的焦煤分类(GB5751-1986)为:
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