Study on the mechanism of metal cations affecting collector adhesion to fine coal
Improving the flotation efficiency of coal is one of the important ways to improve the clean utilization rate of coal.The metal ions in the pulp have a significant effect on the flotation efficiency.In this experiment,the influence mechanism of different metal ion types and concentrations on the adhesion of kerosene on mineral surface was investigated by using high-speed motion camera system and molecular dynamics simulation.The results show that in the presence of metal ions,the oscillation consumption time of oil droplets on the graphite surface is in the order of NaCl<MgCl2<AlCl3.When the ion concentration is 10-2 mol/L,the speed order of forming three-phase contact line is AlCl3<MgCl2<NaCl.The equivalent diameter of oil droplets increases with the increase of NaCl and MgCl2 concentration.When the concentration reaches 10-2 mol/L,the equivalent diameter of oil droplets decreases with the increase of ion concentration.The results of molecular dynamics simulation show that the hydration ability of Na+is the weakest,the contact angle of oil droplets is the smallest,and the contact angle of Al3+is the largest.Appropriate addition of NaCl and MgCl2 can significantly improve the recovery rate of graphite concentrate,while the addition of AlCl3 will inhibit the flotation efficiency.The experimental results are aimed at enriching the theory of flotation pulp conditioning and providing valuable reference for improving flotation efficiency.
metal cationflotation conditioningthree-phase contact linemolecular dynamics simulationflotation test
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维普
