镧系金属-苯甲羟肟酸有机配合物对萤石和方解石的捕收性能研究

萤石、方解石等含钙矿物表面吸附位点同为钙质点, 导致脂肪酸、羟肟酸等常用氧化矿捕收剂对它们的选择性较差, 针对该问题提出利用含钙矿物阴离子的差异性来设计金属离子配合物捕收剂的思路。利用Ce-BHA配合物对萤石与方解石质量比1 GA6FA 1的人工混合矿进行一次粗选浮选试验, 最终可得萤石精矿CaF₂品位78.92%、回收率74.77%, CaCO₃品位11.08%、回收率24.23%, 分离效果良好。与单独使用BHA作捕收剂相比, 浮选精矿CaF₂品位提高约26百分点, 回收率提高约50百分点, 表明该配合物捕收剂对萤石的选择性好。通过量子化学计算了多种镧系金属离子与苯甲羟肟酸(BHA)的作用情况及其在萤石、方解石表面的吸附行为, 结果显示最佳的配合物捕收剂组合为Ce-BHA, 与纯矿物浮选试验结果相符。 

Study on the Collection Properties of Lanthanide Metal-Benzohydroxamic Acid Organic Complexes for Fluorite and Calcite

The adsorption sites on the surface of calcium-bearing minerals are both calcium particles, which leads to poor selectivity of common oxidized ore collectors such as fatty acids and hydroxamic acids. In order to solve this problem, an idea of using the difference of anions of calcium-containing minerals to design metal ion complex collectors is proposed. Through a rough flotation test on the artificial mixed ore of fluorite and calcite with Ce-BHA complex, the final fluorite concentrate product was obtained with a grade of 78.92% and a recovery 74.77% of CaF₂ while a grade of 11.08% and a recovery 24.23% of CaCO₃. Compared with using BHA as collector alone, the grade of CaF₂ of flotation concentrate was increased by about 26%, and the recovery was increased by nearly 50%, indicating that the complex collector has good selectivity for fluorite. The interaction of lanthanide metal ions with benzohydroxamic acid (BHA) and their adsorption behavior on the surface of fluorite and calcite were calculated by quantum chemistry. The results showed that the best collector combination of lanthanide metal ions was Ce-BHA, which was consistent with the results of pure mineral flotation test.