Adsorption performance of copper ions on arsenopyrite surfaces and implications for flotation

Adsorption performance of copper ions on arsenopyrite surfaces and implications for flotation
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铜离子在毒砂表面的吸附性能及其对浮选的影响

DOI:
10.1016/j.apsusc.2019.04.068
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发表时间:
2019-09
影响因子:
6.7
通讯作者:
Lai Hao
Lai Hao
中科院分区:
材料科学1区
文献类型:
--
作者:
Yu Li;Liu Quanjun;Li Shimei;Deng Jiushuai;Luo Bin;Lai Hao

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从贱金属矿石中去除砷是一项重要的环境目标,特别是在矿物加工方面。在此,我们报告了一个调查铜离子的吸附性能毒砂表面和浮选的影响,使用局部电化学阻抗和X射线光电子能谱,飞行时间二次离子质谱,zeta电位测量,和微浮选实验。我们发现,电化学阻抗和程度的毒砂的氧化降低作为Cu 2+吸附到毒砂表面上,和铜物种保持在表面上的形式Cu(I)的处理后,与Cu 2+,而Cu 2+提高了毒砂的表面电荷。经Cu ~(2+)离子处理的毒砂样品的X射线光电子能谱中出现了不均匀分布的Cu信号,铜以硫化铜的形式留在矿物表面。微浮选试验表明,铜离子的加入改善了碱性环境中毒砂的可浮性。
The removal of arsenic from base-metal ores is an important environmental objective, especially in relation to mineral processing. Herein, we report an investigation into the adsorption performance of copper ions on arsenopyrite surfaces and implications for flotation using local electrochemical impedance and X-ray photoelectron spectroscopies, time-of-flight secondary ion mass spectrometry, zeta-potential measurements, and microflotation experiments. We show that the electrochemical impedance and degree of oxidation of the arsenopyrite decreases as Cu2+is adsorbed onto the arsenopyrite surface, and copper species remain on the surface in the form of Cu(I) following treatment with Cu2+, while Cu2+improves the surface charge of the arsenopyrite. A heterogeneously distributed Cu signal appears in the X-ray photoelectron spectrum of the arsenopyrite sample treated with Cu2+ions, and copper in the form of copper sulfide remains on the mineral surface. Microflotation experiments reveal that the low floatability of arsenopyrite in alkaline environments is improved by treatment with Cu2+.
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