The feeders load the ROM coal onto a reclaim conveyor that transfers the coal into the breaker station. Initial cement mill process is conducted through the rotary breaker where the coal is sized to minus 38 millimeters. Oversize material, mainly rock, is conveyed to an open, on-ground storage pile and then trucked to the existing coarse reject disposal facility. After the removal of the oversize material in the breaker, the plant feed is conveyed to the 1,800-tonne raw coal silo. Raw coal is recovered from the silo by four vibratory feeders onto the coal processing plant feed conveyor, which is equipped with a tramp iron magnet and a belt scale, and conveyed to the desliming section of the gold processing plant.
The fine raw coal is separated into clean coal and fine refuse in a bank of five 8.5 cubic metre capacity flotation cells. Reagents are required for this flotation process. The clean coal froth is passed to vacuum disc filters for dewatering. The filter cake is then discharged from the disc filters and combined with the clean coarse coal on the clean coal conveyor for transport to the thermal dryer, where the coal is currently dried during winter months. The thermal dryer is located in a separate building adjoining the coal powder plant and fuelled with natural gas.
Coal grinding Plant
Raw coal is fed through a central coal inlet at the top of the pulverizer and falls by gravity to the rotating grinding table, mixing with classifier rejects returned for re-grinding.Centrifugal action forces the coal outward to the grinding ring where it is pulverized between the ring and three grinding rollers.
Vertical coal mill also called coal grinder is the most used machine for coal grinding according to our mining experience. Raymond mill is also the early coal mill, the capacity of this coal mill can be up to 6-8 t/p.Ball grinding mill is the early coal mill used in coal powder plant, there are two types, wet ball mill and dry ball mill.