The practice of optimized treatment of the raw coal with high dirtcontent at Linhuan Coal Preparation Plant

Because of the wide fluctuation of raw coal property and washability, Linhuan Coal Preparation Plant is facing a series of problem in the operation of its 3-product heavy medium cyclone. These include, among others, low upper size limit of feed, insufficient reject discharge capacity in the case of treating a raw coal feed having a high content of dirt, high heavy medium inlet pressure, high power consumption, etc. After switching to the use of the new-type raw coal heavy medium cyclone in place of the version originally used, it is observed that: in separation of each size fraction and the composite size fractions of the > 0.5 mm coal, the ecart probable epm and organic efficiency is unexceptionally below 0.097 kg/L and over 98%, well demonstrating the high-efficiency separation of raw coal; in separation of the 0.5~0.25 mm size fraction, the epm value is as low as 0.097 kg/L, and the cyclone can wash down to a size of 0.25 mm; the power consumption per ton of raw coal treated is reduced to 0.96 kWh, well meeting the targeted energy conservation objective; and the cyclone system can work with a much higher capacity, efficiency, stability, reliability, a larger feed size and reject discharge capacity. Other attractions include lessening of workload of raw coal pretreatment process, improvement of working environment, reduction of medium inlet pressure, less wear of equipment and process pipes, cutdown of operating and maintenance costs, and convenient production management.