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Gravity concentration is mostly used for coal, gold, iron ore, platinum, chrome and mineral sand beneficiation. Coal . Gravity concentration is used for processing coal fines downstream of a cyclone, following desliming and sizing. After gravity concentration, coal streams are fed into dewatering screens, then into a Siebtechnik centrifuge.
Coal beneficiation, or coal preparation as it is also termed, refers to the processes through which inorganic impurities are separated from raw mined coal, thereby providing improved combustion characteristics to the fuel produced.
mined coal or reducing the associated ash or both. Two basic processes of beneficiation: Dry-deshaling: Non-coal or shaly-coal is removed without using any liquid media. Wet process: Coal is crushed to smaller size and put in a liquid media of adjustable specific gravity to separate the lighter coal (low ash) from heavier coal (high ash).