Run of mine coal is to be treated by jigging (+1/2 mm) and froth flotation (-1/2

Question

Run of mine coal is to be treated by jigging (+1/2 mm) and froth flotation (-1/2 mm). The treatment rate is 500 tph of solid (refer to flowsheet below). Other relevant data are: Particle size analysis +1/2 mm = 90% Ash of run-of-mine coal = 28% Ash of +1/2 mm fraction = 27% Jig reject represents 30% of the jig feed and has an ash content of 70% Flotation concentrate has an ash content of 10% Flotation reject has an ash content of 60%. Calculate the mass of total clean dry coal and the ash percentage Clean coal refers to the concentrate of the unit processes (coal + ash content).

Explanation / Answer

Coal Concentrate - 375 TPH with Ash Content will be 18% to 20%

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