Study on reduction of ash of gas-fat coal using flotation process

In order to explore the feasibility of flotation process for reduction of the ash of the gas-fat coal produced in Jibei Mining Area, Shandong Province, flotation test on roughing and primary cleaning of the fine gas-fat coal is conducted with extended test method, redesigned process flowsheet and diesel oil as collector and sec-octyl alcohole(analytical alconole)as frother.Test result shows that at an optimal dosage of agent of 1.0kg/t, a collector-frother dosage ratio of 5∶1, a pulp density of 80g/L and an agitation speed of 1,800r/min, and through multiple times of froth skimming with a cumulative time of within 150 s, the cumulative yield and ash of concentrate obtained through cleaning operation are 73.95% and 8.47% respectively, which are up to the requirement in quality indices.The polynomial fitting equations are derived based on the nonlinear concentrate yield-ash curve plotted with test data.The study result may serve as a guidance for reduction of ash of gas-fat coal using flotation process in the future.