Scheelite and calcite have similar surface physical and chemical properties and the same calcium ion active sites in the slurry. In order to achieve the flotation separation of the two minerals, high-efficiency flotation depressants are required. In this work, the mixed application of ferric ions (Fe³⁺) and small molecular organic chelating reagent tartaric acid (TA) was used to explore its depressive effect on the flotation separation of scheelite from calcite. The flotation separation effect of scheelite from calcite under the condition of mixed depressant Fe³⁺/TA was studied through microflotation experiments and artificial mixed mineral experiments. The selective adsorption mechanism of the mixed depressant on the two minerals was revealed by zeta potential experiments, solution chemical analysis, thermodynamic analysis, adsorption experiments and X-ray photoelectron spectroscopy (XPS) analysis. The flotation experiments indicated that the mixed depressant can efficiently realize the flotation separation of scheelite from calcite. The mechanism experiments revealed that the mixed depressant had a stronger co-adsorption on the surface of calcite. The pre-adsorption of iron ions provided much adsorption sites for the adsorption of depressant TA, which increased the adsorption amount of TA and iron ions on the surface of calcite, and it hindered the further adsorption of the collector sodium oleate (NaOL). The mixed depressant TA/Fe³⁺ adsorbed on the surface of calcite mainly existed preferentially in the form of the chelate FeL₂⁻.

白钨矿和方解石具有相似的表面物理和化学性质，并且在浆料中具有相同的钙离子活性位点。为了实现两种矿物的浮选分离，需要高效的浮选抑制剂。在这项工作中，使用铁离子（Fe ³⁺）和小分子有机螯合剂酒石酸（TA）的混合应用来研究其对方解石中白钨矿浮选分离的抑制作用。混合抑制剂Fe ³⁺条件下白钨矿与方解石的浮选效果通过微浮选实验和人工混合矿物实验研究了/ TA。通过ζ电势实验，溶液化学分析，热力学分析，吸附实验和X射线光电子能谱（XPS）分析揭示了混合抑制剂对两种矿物的选择性吸附机理。浮选实验表明，该混合降压剂可以有效地实现白钨矿与方解石的浮选。机理实验表明，混合的抑制剂在方解石表面具有较强的共吸附作用。铁离子的预吸附为抑制剂TA的吸附提供了很多吸附位，从而增加了方解石表面TA和铁离子的吸附量，阻碍了捕收剂油酸钠（NaOL）的进一步吸附。混合抑制剂TA / Fe³⁺吸附方解石的表面上主要以螯合物FEL的形式存在优先₂ ^- 。