Interaction mechanism of a novel reagent scheme in the selective separation of scheelite from calcite
Interaction mechanism of a novel reagent scheme in the selective separation of scheelite from calcite
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一种新型试剂方案在方解石中选择性分离白钨矿的相互作用机制
DOI：
10.1016/j.apsusc.2022.154840
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Lei Sun
中科院分区：
文献类型：
--
作者：
Jianjun Wang;Lei Sun
·在pH 10.0时，低剂量EA可选择性抑制方解石。亲水性EA以Ca-EA络合物的形式在方解石上有较强的吸附作用。·方解石表面与EA之间的相反电荷促进了EA在方解石上的吸附。· NaOL捕收剂对白钨矿的吸附能力较强，这是由于其钙活性较高。白钨矿与方解石的选择性分离至今仍是一个难题。依替膦酸（简称EA或H4 L）是一种具有螯合金属离子能力的环保型阻垢剂.本研究采用EA作为选择性萃取剂，将白钨矿与方解石分离。单矿物、二元混合矿物和真实的矿石的浮选试验结果表明，以油酸钠（NaOL）为捕收剂，在pH 10.0时，EA对方解石有较好的选择性。Zeta电位结果表明，EA在带正电的方解石表面的吸附量大于在带负电的白钨矿表面的吸附量。X射线光电子能谱、溶液化学和密度泛函理论（DFT）计算进一步证明，在方解石上，EA的主要物种（HL 3-）中的活性O原子与Ca位发生强烈的化学作用，通过O2 s和Ca 3 p轨道杂化形成亲水性的Ca EA络合物.与此相反，白钨矿与这些的相互作用明显较弱。之后，NaOL倾向于占据白钨矿表面，由于其较高的Ca活性，而不是方解石表面。因此，HL 3-和OL -在两种矿物上吸附的差异实现了白钨矿和方解石的选择性分离。
• Calcite could be selectively depressed by EA at pH 10.0 with a low dosage. • Hydrophilic EA had stronger adsorption on calcite in the form of Ca-EA complex. • Opposite charges between calcite surfaces and EA promoted EA adsorption on calcite. • NaOL collector had stronger adsorption on scheelite due to its higher Ca activity. Up to now, the selective separation of scheelite and calcite is still tricky. Etidronic acid (abbreviated as EA or H 4 L) is an environmental scale inhibitor capable of chelating metal ions. This research adopted the EA as a selective depressant to separate scheelite from calcite. Flotation results of the single mineral, binary mixed minerals, and real ore showed that EA had better selectivity for calcite at pH 10.0 with sodium oleate (NaOL) as a collector. Zeta potential results found that EA adsorption amount on the positively charged calcite surfaces was more significant than that on the negatively charged scheelite surfaces. X-ray photoelectron spectroscopy, solution chemistry, and density functional theory (DFT) calculation further proved that on calcite, the active O atoms in the dominant species (HL 3- ) of EA had a strong chemical interaction with Ca sites to form a hydrophilic Ca–EA complex by O 2s and Ca 3p orbitals hybrid. In contrast, the interaction with these on scheelite was significantly weaker. Afterward, NaOL tended to occupy the scheelite surfaces due to its higher activity of Ca rather than the calcite surfaces. Therefore, the difference in HL 3- and OL - adsorption on both minerals achieved the selective separation of scheelite and calcite.
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