The MagMill (Fig. 1) consists of a pulverizer and a dry separator operating together. It is a method for the precombustion removal of inorganic impurities from coal at the power plant. A concentrated stream of inorganic minerals is withdrawn from the pulverizer and processed by the magnetic separator. Clean coal is recovered and returned to the pulverizer for grinding to specification, and concentrated minerals are rejected. In this fashion, inorganic minerals, including sulfur and trace elements, are reduced in the pulverizer output.
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