In the flotation of magnesite ore, dolomite dissolution and poor water quality can lead to the accumulation of Ca²⁺ in backwater and a slurry of flotation, which can give rise to many problems in the separation of magnesite, dolomite and quartz. This research analysed the effect and mechanism of Ca²⁺ on the anionic/cationic flotation behavior of magnesite, dolomite, and quartz based on flotation tests, zeta potential tests, adsorption tests, Fourier transform infrared spectroscopy (FTIR) tests, and X-ray photoelectron spectroscopy (XPS) tests. When LKD (a cationic collector) was used as a collector, Ca²⁺ inhibited all three minerals via adsorption onto the mineral surface and increased positive electricity. When sodium oleate (NaOL) was used as the collector, Ca²⁺ precipitated with NaOL and adsorbed onto the mineral surface. The adsorption of magnesite and dolomite by precipitation of calcium oleate (CaOL) was found to be weaker than the direct adsorption of NaOL, resulting in the inhibition for magnesite and dolomite, while quartz is activated. In addition, both sodium hexametaphosphate and sodium silicate weakened the effect of Ca²⁺ by forming compounds. Magnesite and dolomite with NaOL can be strongly depressed by calcium hexametaphosphate.

在菱镁矿浮选中，白云石溶解和水质差会导致回水中Ca ²⁺的积累和浮选浆液，这会在菱镁矿，白云石和石英的分离中引起许多问题。这项研究基于浮选测试，ζ电位测试，吸附测试，傅立叶变换红外光谱（FTIR）测试和X射线分析了Ca ²⁺对菱镁矿，白云石和石英的阴离子/阳离子浮选行为的影响及其机理光电子能谱（XPS）测试。当使用LKD（阳离子集电体）作为集电体时，Ca ²⁺通过吸附到矿物表面上抑制了这三种矿物质并增加了正电。当使用油酸钠（NaOL）作为捕收剂时，Ca ²⁺用NaOL沉淀并吸附到矿物表面。发现通过油酸钙（CaOL）的沉淀对菱镁矿和白云石的吸附比对NaOL的直接吸附要弱，导致菱镁矿和白云石的抑制作用，而石英被活化。另外，六偏磷酸钠和硅酸钠都通过形成化合物而减弱了Ca ²⁺的作用。六偏磷酸钙可强烈抑制菱镁矿和白云石与NaOL的结合。