Why is Coal Preparation Need

Raw coal is mixed with various mineral impurities in the process of formation, and inevitably mixed with rocks and other impurities in the roof and floor in the process of mining and transportation. So the raw coal must be prepared, the main purpose of coal preparation can be summarized as follows:

• (1) Remove impurities in run-of-mine coal, reduce ash and sulfur, improve coal quality and meet the needs of users;
• (2) Divide coal into different quality and specifications to meet the needs of users, so as to make effective and rational use of coal and save cost;
• (3) After coal washing, gangue can be discarded on the spot, which can reduce invalid transportation and create conditions for comprehensive utilization of gangue;
• (4) Coal washing can remove most of the ash and 50% – 70% pyrite sulfur, and reduce the air pollution caused by coal combustion. It is the premise of clean coal technology.