Abstract
The processing of two samples of high ash Indian coking coal fines (−500 μm) has been studied. Mechanical cell flotation of two coal samples resulted in poor recovery of combustibles at a specified ash content of 17%. The use of Jameson Cell for flotation was also found helpless in improving the performance. The poor recovery of combustibles was attributed to low recovery of coarse particles (>300 μm). Split processing involving spiral concentration of the coarser fraction (−500 + 100 μm) and Jameson Cell flotation of the −100-μm fraction resulted in an improved overall performance. Substantial improvement in the yield of clean coal at the same target ash (17%) could be achieved in split processing.
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