Coke includes coke reactivity and coke alkalinity resistance, the main one being coke reactivity. Blast furnace coke undergoes strong carbon-soluble reaction in the soft melt zone of the blast furnace, which is the main cause of coke degradation in the blast furnace, so blast furnace coke should have a low reactivity. According to the method of determining the reactivity of lump coke stipulated by China and Japan (see lump coke reactivity index and post-reaction strength), the reactivity index of coke used in large blast furnace should be less than 35%. Foundry coke is mainly used as a heat source in iron furnaces, and should not generate CO as much as possible in the furnace, so foundry coke requires even lower reactivity.
A form of carbon made by thedestructive distillation of coal. Cokeis used for blast-furnaces and othermetallurgical and chemical processesrequiring a source of carbon. Lowergradecokes, made by heating thecoal to a lower temperature, are usedas smokeless fuels for domestic heating.
