Abstract: Abstract:In response to the problem of high surface oxidation degree, high oxygen functional groups, and low yield and high ash content of flotation clean coal in the Luotuoshan Coal Preparation Plant of Wuhai Energy Company, the physical and physicochemical properties of oxidized coal slime were analyzed using elemental analysis, industrial analysis, particle size composition analysis, scanning electron microscopy, and XPS analysis and testing methods. The flotation effect of oxidized coal sludge was compared with that of diesel oil, conventional polar trapping agent and new polar-non-polar composite trapping agent independently developed by the laboratory of the research group, and the parameter optimization of the conditions of the trapping agent and foaming agent was carried out by using the one-way test method. The contact angle test and adsorption test method were used to reveal the action mechanism of the new polar-non-polar composite trapping agent to strengthen the flotation effect of oxidized coal sludge. The mechanism of the new polar-nonpolar composite capture agent to enhance the effect of oxidized coal slurry flotation was revealed. The results show that the flotation of oxidized coal sludge using diesel and conventional polar traps has poor flotation effect, and it is difficult to meet the production requirements; while the flotation of oxidized coal sludge using the new polar-non-polar composite trapping agent has better effect, and the agent is easier to be adsorbed on the surface of oxidized coal sludge, and it significantly improves the contact angle of the surface of the sludge, reduces its wettability to water, and thus enhances the flotation effect of the oxidized coal sludge. At the same time, the flotation of oxidized coal slurry with the new polar-nonpolar composite collector , when the total dosage of the collector is 1200g/t, the yield of refined coal can be up to 74.28%, and the ash content of refined coal is only 7.66%.