Abstract Strategic Ca-bearing minerals such as scheelite and fluorite are usually separated by flotation; however, their separation is quite difficult due to the similarity of the Ca active sites on their surfaces. Lead nitrate-benzohydroxamic acid (Pb-BHA) mixtures show better selectivity for scheelite than the conventional strong collector sodium oleate (NaOL), but their high cost hinders their wide application. Therefore, in this work, a novel collector system (Pb-BHA-NaOL) was developed to overcome the above-mentioned drawback. Flotation results using a single mineral and real ore showed that Pb-BHA-NaOL had better selectivity for scheelite than Pb-BHA. When Pb, BHA, and NaOL were sequentially assembled in a 240:120:1 molar ratio at pH 9.0, the selective separation of scheelite from fluorite was successfully achieved without adding depressants. Additionally, the same scheelite recovery could be achieved while using 20% less Pb and BHA by employing the Pb-BHA-NaOL system rather than the Pb-BHA system. Through zeta potential measurements, solution chemistry calculations, and X-ray photoelectron spectroscopy, the major role of the selective chemical adsorption of Pb-BHA+, Pb-BHA-OL, and Pb(OH)-BHA-OL- on the surface of scheelite in the separation of scheelite from fluorite was revealed, along with the role of NaOL as an accelerator to improve the adsorption modes and capacities of Pb and BHA on scheelite.

中文翻译：

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NaOL 作为促进剂对使用新型自组装 Pb-BHA-NaOL 收集系统从萤石中选择性分离白钨矿的影响

摘要 白钨矿、萤石等战略性含钙矿物通常采用浮选法分离；然而，由于它们表面上 Ca 活性位点的相似性，它们的分离非常困难。硝酸铅-苯异羟肟酸（Pb-BHA）混合物对白钨矿的选择性优于传统的强捕收剂油酸钠（NaOL），但其高昂的成本阻碍了其广泛应用。因此，在这项工作中，开发了一种新型收集器系统（Pb-BHA-NaOL）来克服上述缺点。使用单一矿物和真实矿石的浮选结果表明，Pb-BHA-NaOL 对白钨矿的选择性优于 Pb-BHA。当 Pb、BHA 和 NaOL 在 pH 9.0 下以 240:120:1 的摩尔比顺序组装时，成功地实现了白钨矿与萤石的选择性分离，而无需添加抑制剂。此外，通过使用 Pb-BHA-NaOL 系统而不是 Pb-BHA 系统，可以实现相同的白钨矿回收率，同时减少 20% 的 Pb 和 BHA。通过 zeta 电位测量、溶液化学计算和 X 射线光电子能谱，Pb-BHA+、Pb-BHA-OL 和 Pb(OH)-BHA-OL- 在白钨矿表面的选择性化学吸附的主要作用揭示了白钨矿与萤石分离的过程，以及 NaOL 作为促进剂的作用，以改善 Pb 和 BHA 在白钨矿上的吸附模式和容量。