中国科技核心期刊
美国化学文摘社(CAS)数据库
美国EBSCO学术数据库
日本科学技术振兴机构数据库(JST)
李然1,李娜2,潘洁1*
Li Ran1, Li Na2, Pan Jie1
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。
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.