Study on Energy Consumption in Fine Coal Flotation

Energy is of crucial importance in coal flotation. In the present study, a torque sensor was used to measure the energy consumed during flotation experiments carried out using the optimal reagents dosages and concentration. During flotation, with an increase in flotation time, the clean coal ash gradually increased, the flotation rate constant k values decreased, and the energy required to recover a unit mass of clean coal became greater. With higher agitation speed, the amount of energy consumed also increased. A model of combustible recovery and flotation energy was established. The flotation behavior of narrow size particle agreed with the unclassified size. The flotation rate order of narrow size was as follows: -250 to +125 mu m > -500 to -250 mu m > -125 to +75 mu m > -75 mu m.