Quantum chemistry study of effect of calcium ions on selective separation of muscovite and quartz
Represented by muscovite and quartz,the adsorption behavior of Ca2+on the surface of muscovite and quartz and its effect on the flotation separation behavior of the two minerals were studied by flotation test and zeta potential test. The adsorption affinity of Ca2+complexes at different sites on the surface of two minerals was studied by density functional theory(DFT) calculation,and the adsorption mechanism of Ca2+complexes on the two minerals surfaces was revealed. The results show that the adsorption effect of muscovite on Ca2+is stronger than that of quartz,and the recovery of muscovite increases to 91.38％,while the recovery of quartz reduces to 1.21％ with the addition of 4×10-5 mol/L Ca2+. Ca2+is stably adsorbed on the muscovite and quartz surface by forming Ca—Os bonds and hydrogen bonds with Os atoms on the surface of minerals in the form of[Ca(H2O)4]2+complex. The adsorption affinity of the Ca atom in the complex for the Os atom at the AlOSi site is stronger than that of the Os atom in the SiOH,so[Ca(H2O)4]2+is more inclined to adsorb on the muscovite surface.
Ca2+muscovitequartzadsorptiondensity functional theory calculation
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