Coal is used industrially for many purposes. Because coal is a highly variable product its use is dependent on the individual properties of a coal bed or part of it.
Coal beneficiation, the sizing of coal and the removal of higher specific gravity fractions of the raw coal, is a first step in many utilization processes. Coal beneficiation employs various methods to improve coal quality for a particular industrial application, for example, for the production of metallurgical coke or the production of a lower sulfur content for combustion. The most important methods of these include heavy-media washing to remove mineral matter (Leonard, 1991).