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.
关键词
钙离子/白云母/石英/吸附/密度泛函理论计算
Key words
Ca2+/muscovite/quartz/adsorption/density functional theory calculation
维普
万方数据