Depending on the application, we can divide coal into two main categories.
Metallurgical coal or coking coal
The process by which the coke required for the production of iron and steel uses coking coal. When bituminous coal is heated to extremely high temperatures without the use of air, it transforms into coke, a porous, hard, black rock containing concentrated carbon.
Thermal coal or steaming coal
Burning thermal coal produces steam that powers turbines that then produce energy that is either sent to public electricity grids or used directly by industry.
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