REMOVAL OF NON-COMBUSTIBLES FROM COAL IN MILLS

摘要

A vertical spindle mill (10) for grinding coal comprises a hollow body (11) with a central feed pipe (12) passing vertically through a classifier cone (15) to deliver coal to the interior of the mill (10) and onto a mill table (16). The table (16) is provided with a vane wheel (31) which causes air to circulate upwardly through the interior space (32) enclosed by the body (11). Located on the internal surface of the body (11) are at least two deflector liners (36) which are adapted to collect at least a percentage of the recirculating heavier material from the interior space enclosed by the body (11). A controlled source of air is delivered to a chamber (43) associated with the deflector liners (36).