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在Merensky杂岩矿石的选矿时 ,在用优先浮选流程从硅酸盐脉石中分离铂族金属和贱金属过程中 ,贱金属产生了损失。本文研究了pH 9时 ,在镍黄铁矿 -辉石浮选系统中利用胺络合剂控制辉石的意外活化问题。Zeta电位、二次离子飞行时间质谱法 (Tof-SIMS)和X射线光电子能谱法 (XPS)的分析数据表明 ,在有硫酸铜存在时 ,辉石变得易于被铜离子活化。在被铜离子活化后的矿浆中加入黄药离子后 ,辉石就会被浮选。此外 ,浮选结果和表面分析数据表明 ,辉石也会被Ni(Ⅱ )离子意外活化。导致辉石的浮选回收率提高 ,而矿物分离选择性降低。在有乙二胺 (EDA)存在时 ,辉石和镍黄铁矿表面的Cu(Ⅱ )离子和Ni(Ⅱ )离子的浓度显著减少 ,对辉石的影响更显著。从矿物表面脱除活化离子的机理包括形成稳定的可溶性金属 -EDA螯合物 ,并由于溶解而进入溶液中
During the beneficiation of the Merensky complex ores, base metal losses occurred during the separation of platinum group metals and base metals from silicate gangue by the preferred flotation process. In this paper, the problem of accidental activation of pyroxene by amine complexing agent was studied at pH 9 in a pentlandite-pyroxene flotation system. Zeta potential, Tof-SIMS and XPS analysis showed that pyroxene was easily activated by copper ions in the presence of copper sulfate. After being activated by copper ions, xanthate ions are added into the pulp, the pyroxene will be flotation. In addition, flotation results and surface analysis data show that pyroxenes are also unexpectedly activated by Ni (II) ions. Resulting in pyroxene flotation recovery increased, while the selectivity of mineral separation decreased. In the presence of ethylenediamine (EDA), the concentrations of Cu (Ⅱ) and Ni (Ⅱ) ions on the surface of pyroxene and pentlandite are significantly reduced, and the influence on pyroxene is more significant. The mechanism for the removal of activated ions from the mineral surface involves the formation of a stable soluble metal-EDTA chelate and its dissolution into the solution