氧化态方铅矿表面元素化学态与腐殖酸分子靶向锚定位点的构效关系研究

腐殖酸是极具应用前景的环境友好型方铅矿选择性抑制剂，但腐殖酸抑制方铅矿的机理不明确、效果不稳定制约了其在含铅多金属硫化矿浮选分离工艺中的应用。申请人团队近两年的研究发现，方铅矿表面氧化是腐殖酸在其表面吸附的前提，但腐殖酸为何仅选择性吸附于氧化后的方铅矿表面、通过哪种方式与方铅矿表面哪种氧化产物作用，以及如何通过电位调控控制氧化产物的形成尚需进一步研究。针对上述问题，项目从矿物表面性质角度出发，研究腐殖酸在不同氧化态方铅矿表面的吸附行为及对应的矿物浮选行为，构建腐殖酸吸附-矿物表面氧化-矿物浮选行为的匹配模型。重点基于微观尺度原位表面分析技术EC-TERS，查明腐殖酸在方铅矿表面的靶向吸附位点，结合密度泛函计算，阐明腐殖酸分子与吸附位点的作用方式，揭示腐殖酸对方铅矿选择性抑制的本质，并为调控方铅矿表面吸附位点的生成提供理论支撑，从而促进腐殖酸抑制剂在硫化矿浮选分离工艺中的应用。

Humic acid is a promising selective inhibitor of galena. However, the mechanism of humic acid inhibiting galena is not clear and the effect is still instability, which restricts its application in sulfide mineral flotation. The applicant's research in the past two years found that the surface oxidation of galena is one of the prerequisites for the adsorption of humic acid on its surface. However, why humic acid is only selectively adsorbed on the surface of oxidized galena, which oxidation product play a dominant role, and how to stabilize the formation of oxidation products through potential regulation need further study. Aiming at the problem that the selective inhibition mechanism of humic acid to galena is not clear and its application is restricted, from the perspective mineral surface properties, the project studies the adsorption behavior of humic acid on the surface of galena in different oxidation states, and its corresponding mineral flotation behavior. In order to construct a matching model of humic acid properties - mineral surface oxidation states - mineral flotation hehavior. Particularly, the EC-TERS, a micro-scale surface analysis technique, is introduced to find out the adsorption sites of humic acid on the galena surface. Besides, density functional calculations are employed to reveal the the interaction mode between humic acid and oxidation products. The aim of this project is revealing the selective inhibition of galena by humic acid, and providing theory for the generation of adsorption sites by potential-control, and thereby promoting the application of humic acid as inhibitors in flotation separation.