Flotation Behavior of Arsenopyrite and Pyrite, and Their Selective Separation
Flotation Behavior of Arsenopyrite and Pyrite, and Their Selective Separation
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DOI：
10.2320/matertrans.m2014369
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发表时间：
2015-03
影响因子：
1.2
通讯作者：
Kyuhyeong Park;Junhyun Choi;A. Gomez-Flores;Hyunjung Kim
中科院分区：
文献类型：
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作者：
Kyuhyeong Park;Junhyun Choi;A. Gomez-Flores;Hyunjung Kim
以黄药为捕收剂，研究了pH和矿浆电位（EH）对单一矿物毒砂和黄铁矿在哈利蒙管中可浮性的影响。在此基础上，采用毒砂和黄铁矿混合样品，进一步考察了毒砂和黄铁矿的选择性指标。为了通过pH变化检查每种矿物的浮选行为，在pH 4和pH 10下进行浮选。试验结果表明，毒砂在pH为4时，无论乙基黄药钾（PEX）的浓度如何，都具有较高的可浮性。这是由于矿浆中的黄药离子被氧化成稳定的双黄药，并被吸附在毒砂表面。同时，毒砂在pH 10时的可浮性比pH 4时低，这是由于矿浆的pH值相对较低，使得双黄药不稳定，不能吸附在毒砂表面。黄铁矿在pH 4和pH 10下的可浮性都很低。与毒砂一样，pH 10时的结果是由于矿浆的EH值低造成的。然而，有趣的是，与毒砂的情况不同，黄铁矿在pH 4下具有低的可浮性，尽管其高EH。进行FTIR分析，以检查这种矛盾行为的原因。分析结果表明，这是由于黄药吸附不良，由于硫酸根离子（SO 4）的黄铁矿表面的氧化反应中产生的氧在纸浆中的pH 4。为了进一步研究选择性指数（即，黄铁矿回收率/毒砂回收率），对两种矿物的混合试样进行了附加浮选试验。与单矿物的浮选行为不同，实验结果表明，毒砂的回收率低于黄铁矿，且在PEX浓度最低时，毒砂和黄铁矿的选择性指数最高。混合样品的浮选行为与单一矿物的浮选行为不同的原因是，在毒砂和黄铁矿的混合样品中，受EH影响较大的毒砂表面氧化反应，在毒砂表面生成亲水性化合物砷酸铁，导致毒砂与黄药的吸附作用减弱，从而降低了毒砂的可浮性。[doi：10.2320/matertrans.M2014369]
This study investigated the effect of pH and pulp potential (EH) on the floatability of arsenopyrite and pyrite, which are single minerals, in Hallimond tube, by using xanthate as a collector. On this basis, the study further investigated the selectivity index of arsenopyrite and pyrite, using a mixed sample of arsenopyrite and pyrite. To examine the flotation behavior of each mineral by pH change, flotation was carried out at pH 4 and pH 10. The test results showed arsenopyrite had higher floatability at pH 4, regardless of the potassium ethyl xanthate (PEX) concentration. This is because xanthate ion was oxidized to be stable dixanthogen, which was well adsorbed onto arsenopyrite surface, due to the high EH of pulp. Meanwhile, arsenopyrite had relatively lower floatability at pH 10 than at pH 4, which was because the dixanthogen remained unstable, and was not adsorbed onto the arsenopyrite surface, due to the relatively low EH of pulp. Pyrite had low floatability at both pH 4 and pH 10. Just as for arsenopyrite, the result for pH 10 was caused by the low EH of pulp. Yet, interestingly enough, different from the case of arsenopyrite, pyrite at pH 4 had low floatability, despite its high EH. FTIR analysis was performed, to examine the reason for such contradictory behavior. The analysis result showed that this was caused by poor adsorption with xanthate, due to sulfate ion (SO4) that was generated by the oxidation of pyrite surface in reaction with oxygen in pulp at pH 4. To further investigate the selectivity index (i.e., the pyrite recovery/ arsenopyrite recovery ratio) of arsenopyrite and pyrite, additional flotation tests were carried out on mixed sample of the two minerals. Different from the flotation behavior of single minerals, the results showed that the recovery of arsenopyrite was lower than that of pyrite, and the selectivity index of arsenopyrite and pyrite was the highest when the PEX concentration was the lowest. Such a different trend in flotation behavior of the mixed sample from the flotation behavior of the single minerals was because the surface oxidation reaction of arsenopyrite, which was more affected by EH among the mixed arsenopyrite and pyrite, generated ferric arsenate, a hydrophilic compound, on the surface of arsenopyrite, resulting in poor adsorption with xanthate; in turn, this depressed the floatability of arsenopyrite. [doi:10.2320/matertrans.M2014369]