Study of flotation column gas holdup and influence factors to slurry separation

Pressure difference method was used to monitor gas holdup in flotation column. The influences of circulating pressure, air flow and frother concentration on gas holdup and the influence of gas holdup on slurry separation were mainly studied by Orthogonal and slurry flotation experiments. The results show that frother concentration is the most important factor that could affect gas holdup, and air flow is the second, and the circulating pump pressure is the third. The recovery and ash of cleaned coal increase with the increasing of gas holdup in a certain range, so the quality of cleaned coal decline. When gas holdup is 24.17%, the recovery of cleaned coal is 87.35%, and its ash is 10.02%. With the increasing of circulating pressure, the cleaned coal recovery increases, but its ash declines slightly. The gas holdup can be used as a reference standard for regulating the mineral separation indexes of flotation column.