Both blast furnace coke and foundry coke are made by baking a blend of selected coking coals in certain high temperature without contact with air until almost all of the volatile matter is driven off. The resulting product, coke, consists principally of carbon, as listed in above table. By-products are crude coal tar, light oils, and ammonia, etc.

Generally speaking, chemistry, size, and strength have been considered the most important properties for use in the blast furnace. Other important factors are coke reactivity and csr (coke strength after reactivity), which deal with the amount and size of pores and walls, porosity, and density. Carbon textures and microstructure are two main factors that affect the reactivity, stability, and the coke strength after reaction.


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