Little attention has been paid to the catalytic effects of sulfide minerals and their dissolution behaviors in treating flotation effluents by advanced oxidation processes (AOPs). In this work, the improved ozonation of recalcitrant O-isopropyl-N-ethylthionocarbamate (IPETC) collector by adding galena was investigated with the disclosure of galena dissolution. The removal efficiency of IPETC and its mineralization was compared by sole ozonation and galena catalytic ozonation. The galena dissolution process was examined by determining Pb(II) concentrations and analyzing galena surface with X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The galena had remarkably increased the IPETC removal and promoted its mineralization by the ozonation. Simultaneously, the ozone consumption could be significantly reduced. The catalytic decomposition of ozone on galena surface resulted in the yield of more hydroxyl radicals, leading to the enhanced removal of IPETC. The released Pb(II) concentrations were as high as 14.9–23.2 mg/L after the ozonation, indicating the significant dissolution of galena. The XPS and FTIR analysis confirmed the formation of lead oxides with high solubility after the oxidation of galena. The negative impacts of releasing toxic heavy metals from sulfide minerals were discussed while the flotation effluents were treated by the AOPs.

硫化矿物质的催化作用及其在通过高级氧化工艺（AOP）处理浮选废水中的溶解行为鲜为人知。在这项工作中，改进了顽固性O-异丙基-N的臭氧氧化通过方铅矿溶解的研究，研究了通过添加方铅矿的β-乙基硫代氨基甲酸酯（IPETC）捕收剂。通过单独的臭氧化和方铅矿催化臭氧化比较了IPETC的去除效率及其矿化。通过确定Pb（II）浓度并用X射线光电子能谱（XPS）和傅里叶变换红外（FTIR）光谱分析方铅矿表面来检查方铅矿溶解过程。方铅矿显着增加了IPETC的去除并通过臭氧化促进了其矿化作用。同时，臭氧消耗量可以大大减少。方铅矿表面臭氧的催化分解导致更多羟基自由基的产生，从而提高了IPETC的去除率。臭氧化后释放的Pb（II）浓度高达14.9–23.2 mg / L，表明方铅矿明显溶解。XPS和FTIR分析证实了方铅矿氧化后形成了具有高溶解度的氧化铅。讨论了用AOP处理浮选废水时从硫化物矿物中释放有毒重金属的负面影响。