【摘要】 高硫次生铜矿的浮选分离面临着诸多挑战，包括高pH矿浆环境、黄药选择性差及其与Z-200复配成本较高等问题。本研究采用原料成本低、合成路线短的复合硫氨酯捕收剂TJ-215，当pH>8时其对辉铜矿的捕收能力强于Z-200，具备更好的与黄铁矿分离的选择性。Zeta电位测试与红外光谱分析结果表明，TJ-215化学吸附在辉铜矿表面，增强了表面的疏水性。XPS检测、DFT计算进一步揭示TJ-215中的NH—C=S和C=N—OH基团与辉铜矿表面的铜离子分别形成了Cu—S、Cu—N和Cu—O键。结果表明，相较于Z-200分子中单一的硫脲基团(NH—C=S),TJ-215通过分子中NH—C=S和C=N—OH基团的协同配位强化了对辉铜矿的捕收作用。本研究为在弱碱性环境中使用TJ-215替代Z-200实现辉铜矿与黄铁矿分离提供了理论依据。更多还原

【Abstract】 The flotation separation of high pyrite content secondary copper ores faces challenges including elevated pH levels, poor xanthate selectivity, and higher costs associated with its combination with Z-200. In this work, a composite thionocarbamate collector(TJ-215), with low-cost raw materials and a short synthetic route, showed a better selectivity for chalcocite than Z-200 when pH>8. Zeta potential analysis indicated a stronger interaction between TJ-215 and chalcocite. These results were achieved through the synergistic coordination of NH—C=S and C=N—OH in TJ-215 molecule, compared with the single thiourea group, NH—C=S, in Z-200 molecule. At low-alkaline condition, the NH—C=S in TJ-215 formed Cu—S, Cu—N bonds with Cu atoms, and the C=N—OH combined with Cu to form a Cu—O bond. The results of this study provide guidance on the replacement of Z-200 by TJ-215 in the separation of chalcocite from pyrite in weak alkaline conditions.更多还原