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Electrodeposition on pyrite from copper(I) cyanide electrolyte

机译:来自铜(I)氰化物电解质的黄铁矿上的电沉积

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摘要

Cyanide and copper often co-exist in process water with complicated speciation. The deposition of copper on pyrite from cyanide bearing solutions is unknown and is the objective of this study. The electrochemical behaviour of pyrite in a solution with CN/Cu mole ratio of 3/1 has been investigated in different solution pH values. It was found that, at pH 7, cuprous cyanide can be oxidized to Cu(II) oxide/hydroxide which deposit on the pyrite surface and transform to Cu(I)-sulfide during the subsequent cathodic sweeping. However, this anodic deposition process is inhibited either at pH 10 due to the dissolution of solid Cu(II)/Cu(I)species by Cu(CN)3(2-), or at pH 5 due to the high solubility of Cu(II) oxide/hydroxide. On the other hand, Cu(CN)(2)(-) can be deposited onto pyrite, forming a Cu(I)-sulfide layer at more reducing potentials. The understanding of the electrodeposition mechanisms provides opportunities for the recovery of copper from cyanide-bearing waste water, as well as the separation of pyrite from other raw materials by altering its surface properties.
机译:氰化物和铜通常共存在处理水中,具有复杂的形态。铜对氰化物轴承溶液的硫铁矿沉积是未知的,是本研究的目的。在不同的溶液pH值中研究了CN / Cu摩尔比的溶液中黄铁矿的电化学行为。发现,在pH7,亚铜氰化物可以被氧化成Cu(II)氧化物/氢氧化物,该氧化物/氢氧化物沉积在黄铁矿表面上并在随后的阴极扫描期间转化为Cu(I) - 硫化物。然而,由于Cu(CN)3(2-)的固体Cu(II)/ Cu(I)物种,或在pH5由于Cu的高溶解度,该阳极沉积过程抑制了pH10。 (ii)氧化物/氢氧化物。另一方面,Cu(CN)(2)(2)( - )可以沉积在硫铁土上,在更低的电位下形成Cu(I)-Sulfide层。对电沉积机制的理解提供了通过改变其表面性质的从氰化物废水中恢复来自氰化物废水的铜的机会,以及通过改变其表面性质的硫铁斯分离。

著录项

  • 来源
    《RSC Advances》 |2016年第3期|共8页
  • 作者

    Guo B.;

  • 作者单位

    Univ Queensland Sch Chem Engn Brisbane Qld 4072 Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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