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铜(Ⅱ)-氨-硫代硫酸盐浸金液中Fe3+对砷黄铁矿 电化学氧化行为的影响研究

  • 作者:
  • 李然1,李娜2,潘洁1*

  • 作者单位:
  • (1. 昆明冶金高等专科学校环境与化工学院;2. 云南承卓科技有限公司)
  • 基金项目:

  • 云南省科技厅基础研究青年项目(2018FD065)
  • 详细信息:

  • 作者简介:
  • 李 然(1981—),男,副教授,硕士,从事废弃物资源化利用研究工作;E⁃mail:1098504253@qq. com
  • 通讯作者:
  • 潘洁(1987—),女,副教授,硕士,从事水处理、废物资源化利用研究工作;E⁃mail:89216671@qq. com
  • PDF下载

Effect of Fe3+ on electrochemical oxidation behavior of arsenopyrite in copper(Ⅱ)-ammonia-thiosulfate gold leaching solution

  • English Author:
  • Li Ran1, Li Na2, Pan Jie1

  • Unit:
  • (1. Faculty of Environmental and Chemical Engineering, Kunming Metallurgy College; 2. Yunnan Chengzhuo Technology Co., Ltd.)
  • 摘要
  • 在线预览
  • 参考文献

摘要:

砷黄铁矿是金矿中常见的载金矿物,金颗粒通常作为“隐形金”包含在砷黄铁矿中而难以高效回收。针对铜(Ⅱ)-氨-硫代硫酸盐浸金液,通过循环伏安曲线、培菲尔曲线、电化学阻抗等电化学方法和XPS表征分析方法,研究加入Fe3+对砷黄铁矿氧化行为的影响。电化学结果显示:砷黄铁矿在加入Fe3+后,其氧化峰左移且峰强度增大,氧化反应电位由 0.5~0.6 V降低至 0.25 V附近。XPS表征结果显示:加入氧化剂 Fe2(SO4)3后,砷黄铁矿电极表面出现 S0,Fe(Ⅱ)- AsS含量变低,As(Ⅲ)、As(V)含量增加,进一步验证电化学测试结果。该研究证实,在铜(Ⅱ)-氨-硫代硫酸盐浸金液中添加氧化剂Fe3+,可有效提高含金砷黄铁矿的金浸出率。

关键词:

硫代硫酸盐浸金;Fe3+;砷黄铁矿;电化学氧化;循环伏安;电化学阻抗;X射线光电子能谱

Abstract:

Arsenopyrite is a common gold‑bearing mineral in gold ores, where gold particles are often encapsulatedas"invisible gold"within arsenopyrite, making efficient recovery challenging. The effect of Fe3+ addition on the oxidationbehavior of arsenopyrite in the copper(Ⅱ)-ammonia-thiosulfate gold leaching system was studied using electrochemicalmethods such as cyclic voltammetry curves, Tafel curves, and electrochemical impedance spectroscopy curves, combinedwith X‑ray photoelectron spectroscopy(XPS)characterization. Electrochemical results indicate that after the additionof Fe3+ , the oxidation peak of arsenopyrite shifts leftward with increased intensity, and the oxidation reaction potentialdecreases from 0.5-0.6 V to around 0.25 V. XPS characterization reveals that after adding the oxidizing agent Fe2(SO4)3, S0 appears on the arsenopyrite electrode surface; the content of Fe(Ⅱ)-AsS decreases, and the contents of As(Ⅲ)and As(Ⅴ)increase, further validating the electrochemical findings. This study confirms that the addition of Fe3+ inthe copper(Ⅱ)-ammonia-thiosulfate gold leaching system can effectively enhance the gold leaching rate fromgold‑bearing arsenopyrite.

Keywords:

thiosulfate gold leaching; Fe3+ ; arsenopyrite; electrochemical oxidation; cyclic voltammetry; electro‑chemical impedance; XPS