In the flotation of magnesite, it is not easy to separate magnesite from calcite. Under this study, Sodium tripolyphosphate (STSP) was considered to be an inhibitor for improving the flotation separation efficiency of magnesite from calcite. Through relevant analysis, such as potentiodynamic potential measurement, infrared spectrum analysis, XPS testing and Quantum chemistry calculation, the selective inhibition of STSP on calcite was proved. Flotation results of pure minerals showed that the floating rate of calcite declined quickly from 90% to15% in the wake of raise of STSP dosage, but the flotation recovery of magnesite remains high (recovery 90%) at pH 10.0. Then it was proved that the flotation separation of magnesite and calcite could be realized effectively under the right dosage of the reagent through the experiment of artificial mixed ore. Potentiodynamic potential changes and infrared spectrum analysis showed that STSP is easier to react with calcite, which prevented from the adsorption of NaOl on the calcite surface further. XPS analysis and DFT calculation further showed that STSP was strongly bound to Ca sites on the surface of calcite, but weakly bound to Mg sites on the surface of magnesite. Therefore, STSP is an effective flotation inhibitor for magnesite and calcite.

在菱镁矿的浮选中，菱镁矿与方解石的分离并不容易。在这项研究中，三聚磷酸钠 (STSP) 被认为是提高菱镁矿与方解石浮选分离效率的抑制剂。通过动电位测量、红外光谱分析、XPS测试和量子化学计算等相关分析，证明了STSP对方解石的选择性抑制作用。纯矿物浮选结果表明，随着STSP用量的增加，方解石的浮选率从90%迅速下降到15%，但在pH 10.0时菱镁矿的浮选回收率仍然很高（回收率90%）。然后通过人工混矿实验证明，在合适的药剂用量下，可以有效地实现菱镁矿和方解石的浮选分离。动电位变化和红外光谱分析表明，STSP更容易与方解石反应，从而进一步阻止了NaOl在方解石表面的吸附。XPS 分析和 DFT 计算进一步表明，STSP 与方解石表面的 Ca 位点结合较强，而与菱镁矿表面的 Mg 位点结合较弱。因此，STSP 是一种有效的菱镁矿和方解石浮选抑制剂。XPS 分析和 DFT 计算进一步表明，STSP 与方解石表面的 Ca 位点结合较强，而与菱镁矿表面的 Mg 位点结合较弱。因此，STSP 是一种有效的菱镁矿和方解石浮选抑制剂。XPS 分析和 DFT 计算进一步表明，STSP 与方解石表面的 Ca 位点结合较强，而与菱镁矿表面的 Mg 位点结合较弱。因此，STSP 是一种有效的菱镁矿和方解石浮选抑制剂。