2. Coking coal is a kind of coal, and coke is the product after coking coal.
3. Coking coal is a kind of bituminous coal with high metamorphic degree. When coking alone, the generated colloid has good thermal stability, and the obtained coke is large, with few cracks and high strength. But coke is a solid fuel, which is hard, porous and has a high calorific value. It is made from high-temperature dry distillation of coal, which is mostly used for ironmaking.