The development of organic depressants for sulfide mineral flotation has received widespread attention, and metal ions can enhance or weaken the depression effect of organic depressants. In this study, the flotation behavior of pectin-treated galena and chalcopyrite in the presence and absence of copper sulfate was investigated through micro-flotation tests. Results showed that pectin merely depressed galena and chalcopyrite flotation under alkaline conditions while selectively imparting strong hydrophilicity to the copper-sulfate-treated galena surface. Contact angle, reagent adsorption, zeta potential, and atomic force microscopy measurements were conducted to evaluate the effect of copper sulfate on pectin adsorption on galena surfaces. Overall, copper ions could deposit on galena surfaces, and the surface reactivity was improved due to the generation of highly conductive or positively charged copper substances. Furthermore, the adsorption thickness and capacity of pectin on modified galena surface was facilitated. X-ray photoelectron spectroscopy results further revealed that the covered copper sulfides and hydroxides induced pectin chemically adsorption to generate S–Cu–O and Cu–O–R species.

开发用于硫化物矿物浮选的有机抑制剂受到广泛关注，金属离子可以增强或减弱有机抑制剂的抑制剂作用。在这项研究中，通过微浮选试验研究了在硫酸铜存在和不存在下果胶处理方铅矿和黄铜矿的浮选行为。结果表明，果胶在碱性条件下仅抑制方铅矿和黄铜矿的浮选，同时选择性地赋予硫酸铜处理的方铅矿表面强亲水性。进行接触角、试剂吸附、zeta 电位和原子力显微镜测量以评估硫酸铜对方铅矿表面果胶吸附的影响。总的来说，铜离子可以沉积在方铅矿表面，由于产生高导电性或带正电荷的铜物质，表面反应性得到改善。此外，还促进了果胶在改性方铅矿表面的吸附厚度和容量。X 射线光电子能谱结果进一步表明，覆盖的硫化铜和氢氧化铜诱导果胶化学吸附，生成 S-Cu-O 和 Cu-O-R 物种。