Although sulfidization is a very beneficial method to enhance the floatability of smithsonite, the presence of inevitable dissolved oxygen (DO) deteriorates it by unclear mechanisms. This work investigated the sulfidization process and the sulfidization products on smithsonite surface under various DO conditions by means of in-site electrochemical quartz microbalance (eQCM), zeta potential tests, and X-ray photoelectron spectroscopy (XPS) analysis. A strong correlation between sulfidization products and the DO contents was established. The stable sulfidization products was rapidly formed on the smithsonite surface under anoxic condition, but it could be oxidized to sulfate by DO. The oxidation of sulfidization products further reduce the floatability of smithsonite. These results suggested that DO had extremely negative effect on sulfidization flotation of smithsonite, which might provide important guidance for industrial application.

尽管硫化是提高菱锌矿可浮性的一种非常有益的方法，但不可避免的溶解氧 (DO) 的存在会通过不清楚的机制使其劣化。本工作通过现场电化学石英微天平（eQCM）、zeta电位研究了不同DO条件下菱镁矿表面的硫化过程和硫化产物。测试和 X 射线光电子能谱 (XPS) 分析。建立了硫化产物与 DO 含量之间的强相关性。在缺氧条件下，菱锌矿表面迅速形成稳定的硫化产物，但可被DO氧化成硫酸盐。硫化产物的氧化进一步降低了菱锌矿的可浮性。这些结果表明，DO对菱镁矿的硫化浮选具有极不利的影响，可为工业应用提供重要指导。