Method for concentrating the exinite group macerals from coal by froth flotation

摘要

A method for separating the exinite group macerals from the total coal by froth flotation in the presence of at least one short chain alcohol frothing agent and at least one methyl polyglycol type frothing agent in a first froth flotation zone to produce an exinite and other coal maceral- rich stream which is thereafter subjected to froth flotation in a second froth flotation zone in the presence of a short chain alcohol frothing agent to produce an exinite group maceral-rich stream and a stream rich in other coal macerals with the exinite-rich stream thereafter being mixed with an additional quantity of a short chain alcohol frothing agent and passed to a third froth flotation zone to produce an exinite group maceral group concentrate stream which is thereafter processed to produce a particulate exinite maceral group concentrate.