Abstract Flotation collectors with strong collecting ability and superior selectivity have important application prospects for recovering complex and refractory copper sulfide resources. Herein, a novel surfactant of N-benzoyl-N’,N’-diethyl thiourea (BDETU) with C O and C S groups is synthesized for separation of chalcopyrite and pyrite. The flotation performance and adsorption mechanism of BDETU to chalcopyrite and pyrite were evaluated by flotation experimental, adsorption experimental, contact angle measurements, UV–vis spectroscopy, as well as FTIR analyses and DFT calculation. By comparing the flotation performances with the traditional flotation collector of O-isopropyl-N-ethyl thionocarbamate (IPETC), it becomes evident that BDETU exhibit stronger collecting ability and excellent selectivity for chalcopyrite against pyrite. These results might be attributed to the facts that BDETU can selectively adsorb on the surface of chalcopyrite and strengthen its surface hydrophobicity, while the hydrophobicity of pyrite surface is not improved with the weak adsorption of BDETU on its surface. The analyses of adsorption mechanism reveal that BDETU is chemically adsorbed on the surface of chalcopyrite by the reactions of the functional groups (C O and C S) to the copper species with the formation of C O Cu and C S Cu structures.

中文翻译：

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N-苯甲酰基-N',N'-二乙基硫脲对黄铜矿和黄铁矿的浮选性能及界面吸附机理研究

摘要 捕收能力强、选择性优越的浮选捕收剂在回收复杂难熔硫化铜资源中具有重要的应用前景。本文合成了一种新型表面活性剂 N-苯甲酰基-N',N'-二乙基硫脲 (BDETU)，具有 CO 和 CS 基团，用于分离黄铜矿和黄铁矿。通过浮选实验、吸附实验、接触角测量、紫外-可见光谱以及FTIR分析和DFT计算评价了BDETU对黄铜矿和黄铁矿的浮选性能和吸附机理。通过与传统的O-异丙基-N-乙基硫代氨基甲酸酯（IPETC）浮选捕收剂的浮选性能比较，可以看出BDETU具有更强的捕收能力和对黄铜矿对黄铁矿的优异选择性。这些结果可能归因于BDETU可以选择性地吸附在黄铜矿表面并增强其表面疏水性，而黄铁矿表面的疏水性并未随着BDETU在其表面的弱吸附而提高。吸附机理分析表明，BDETU通过官能团（CO和CS）与铜物种的反应化学吸附在黄铜矿表面，形成CO Cu和CS Cu结构。