In this study, a novel collector, named O-methylisobutyl-N-allyl thionocarbamate (MIBATC) was synthesized and characterized by Fourier Transform Infrared Spectrometer (FTIR), C NMR, H NMR analysis. The flotation behavior of MIBATC was investigated by flotation experiments and interaction mechanism was conducted by adsorption amount, zeta potential, FTIR, X-ray photoelectron spectroscopy (XPS) measurements and density functional theory (DFT) calculation. Flotation results demonstrated that MIBATC appeared powerful collecting ability to chalcopyrite against sphalerite and pyrite. The recovery of chalcopyrite was more than 80 % with pH of 9.5–10 and MIBATC concentrate of 30–40 mg/L. Adsorption amount and zeta potential measurements showed a tendency that MIBATC exhibited more affinities for the chalcopyrite compared with sphalerite and pyrite. FTIR and XPS analysis provided the evidence that MIBATC chemisorbed on chalcopyrite surface of Cu site, whereas physisorbed on sphalerite and pyrite surface. Specially, DFT reconfirmed the fact that S atom in MIBATC donated electrons to Cu on chalcopyrite surface and the adsorption energy was −21.67 kcal/mol, regarding as an exothermic reaction. These findings provided evidence for superior separating chalcopyrite from sphalerite and pyrite in the presence of MIBATC.

中文翻译：

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新型选择性捕收剂MIBATC及其浮选黄铜矿与闪锌矿和黄铁矿的性能


本研究合成了一种新型捕收剂O-甲基异丁基-N-烯丙基硫代氨基甲酸酯(MIBATC)，并通过傅里叶变换红外光谱仪(FTIR)、13C NMR、1H NMR分析进行了表征。通过浮选实验研究了MIBATC的浮选行为，并通过吸附量、zeta电位、FTIR、X射线光电子能谱（XPS）测量和密度泛函理论（DFT）计算来研究相互作用机制。浮选结果表明，与闪锌矿和黄铁矿相比，MIBATC对黄铜矿表现出强大的捕收能力。 pH 值 9.5~10、MIBATC 精矿浓度 30~40 mg/L 时，黄铜矿回收率超过 80%。吸附量和 zeta 电位测量表明，与闪锌矿和黄铁矿相比，MIBATC 对黄铜矿表现出更多的亲和力。 FTIR和XPS分析证明MIBATC化学吸附在Cu位点的黄铜矿表面，而物理吸附在闪锌矿和黄铁矿表面。特别是，DFT再次证实了MIBATC中的S原子向黄铜矿表面的Cu提供电子，吸附能为-21.67 kcal/mol，被视为放热反应。这些发现为在 MIBATC 存在下更好地将黄铜矿与闪锌矿和黄铁矿分离提供了证据。