氧化预处理对铜钼浮选分离效果的影响

Influence of Oxidation Pretreatment on Chalcopyrite-Molybdenite Flotation Separation Efficiency

以NaClO或H_(2)O_(2)为氧化剂,研究了氧化对铜钼浮选分离试验效果的影响。探究了氧化剂用量、氧化时间和矿浆pH值等因素对黄铜矿和辉钼矿可浮性的影响以及作用机理。单矿物浮选实验结果表明,NaClO或H_(2)O_(2)氧化处理均可选择性抑制黄铜矿,且几乎不影响辉钼矿的可浮性。混合矿浮选实验结果表明,NaClO或H_(2)O_(2)氧化预处理-浮选都能实现铜钼有效分离,且分离效果均优于传统的黄铜矿抑制剂硫化钠。接触角测量结果表明,NaClO或H_(2)O_(2)氧化处理都可选择性地使黄铜矿表面亲水。Zeta电位和XPS分析结果表明,黄铜矿表面变得亲水是因为氧化处理后矿物表面生成了不溶于水的亲水性氧化物和氢氧化物。

The effect of oxidation pretreatment on chalcopyrite-molybdenite flotation separation was studied using NaClO or H_(2)O_(2) as the oxidants.The effects of oxidant dosage,oxidation time and pulp pH on the floatability of chalcopyrite and molybdenite,as well as the oxidation mechanism were all studied.The results of single mineral flotation show that,after the oxidation with NaClO or H_(2)O_(2),the flotation of chalcopyrite was inhibited while the molybdenite flotation was barely influenced.Mixed mineral flotation tests show that this process of oxidation pretreatment with NaClO or H_(2)O_(2) followed by flotation can result in a better selective flotation separation of chalcopyrite and molybdenite than that using traditional copper depressant sodium sulfide.Contact angle measurement shows that the chalcopyrite surface could be rendered hydrophilic selectively by the oxidation.Zeta potential and XPS analyses show that the hydrophilicity of chalcopyrite can be attributed to water-insoluble hydrophilic oxides and hydroxides generated thereon during the oxidation pretreatment.