This research introduces N-butyl thiophosphoric triamide (NBPT) as a novel selective collector for chalcopyrite and investigates its adsorption characteristics and mechanisms on both chalcopyrite and pyrite surfaces. The results of single and binary mixed mineral flotation tests demonstrated that at a slurry pH of 8, an effective separation between chalcopyrite and pyrite could be achieved using NBPT as the collector and methyl isobutyl carbinol (MIBC) as the frother. Additionally, the selective adsorption mechanism of NBPT on chalcopyrite was elucidated through adsorption density measurements, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. Adsorption density analysis showed that NBPT was more inclined to adsorb on the chalcopyrite surface rather than the pyrite surface. In addition, FT-IR analysis indicated that the adsorption intensity of NBPT on chalcopyrite was much higher than that on pyrite. XPS analysis and DFT calculations further indicated that chemisorption occurs between the S atoms of NBPT itself and the Cu sites on the surface of chalcopyrite, forming S-Cu coordination bonds, whereas only physisorption occurs on the surface of pyrite. This differentiated adsorption mechanism is key to the selective collection of chalcopyrite by NBPT. In conclusion, NBPT, as an environmentally friendly collector, demonstrated broad application prospects in chalcopyrite-pyrite flotation systems.

中文翻译：

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高性能捕收剂吸附的界面区分，实现黄铜矿与黄铁矿的选择性浮选分离

本研究介绍了 N-丁基硫代磷酸三酰胺 （NBPT） 作为黄铜矿的新型选择性捕收剂，并研究了其在黄铜矿和黄铁矿表面的吸附特性和机制。单一和二元混合矿物浮选试验结果表明，在浆料 pH 值为 8 时，使用 NBPT 作为捕收剂，甲基异丁基甲醇 （MIBC） 作为起泡剂可以实现黄铜矿和黄铁矿之间的有效分离。此外，通过吸附密度测量、傅里叶变换红外光谱 （FT-IR）、X 射线光电子能谱 （XPS） 和密度泛函理论 （DFT） 计算，阐明了 NBPT 在黄铜矿上的选择性吸附机制。吸附密度分析表明，NBPT 更倾向于吸附在黄铜矿表面而不是黄铁矿表面。此外，FT-IR 分析表明，NBPT 在黄铜矿上的吸附强度远高于黄铁矿。XPS 分析和 DFT 计算进一步表明，NBPT 本身的 S 原子与黄铜矿表面的 Cu 位点之间发生化学吸附，形成 S-Cu 配位键，而黄铁矿表面仅发生物理吸附。这种差异化的吸附机制是 NBPT 选择性收集黄铜矿的关键。综上所述，NBPT 作为一种环保型捕收剂，在黄铜矿-黄铁矿浮选系统中显示出广阔的应用前景。