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Coal Washery

Coal Washery Reject

Coal Washery Description

Coal reject material or colliery spoil is a by-product of the coal preparation process and is mostly produced in conjunction with the beneficiation of coking coal. Raw coal is washed to remove the high ash materials contained within it when it is mined. The material producing ash includes: plies of non-carbonaceous or low carbonaceous material within the coal seam; roof and floor material inadvertently mined with the coal; and dyke rocks that have intruded into the coal seam. The generated quantity of coal washery reject in China divides evenly between South and North – the two principal coal producing states. About 20% of the total coal washery reject is produced as tailings and 80% as coarse coal reject.


Coal Washery Applications and Limitations

Coal washery process has been used successfully within unsealed road pavements and for haul roads at many collieries. Coal washery plant has been used sparingly by the many cities in the China as a subbase material. Subbase coal washery process is typically stabilised with cement in India.


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