Coal is a combustible sedimentary rock formed from ancient plant matter subjected to heat and pressure over millions of years. It is primarily composed of carbon, along with varying amounts of hydrogen, sulfur, oxygen, and nitrogen. Coal is classified into types based on carbon content and calorific value: Anthracite – Hardest, highest carbon content, and cleanest burning. Bitumino... https://www.kerone.in/coal-briquette-dryer/