摘要
氯酸钾浸出金是处理卡林型难处理金矿潜在的技术手段。在氯酸钾浸金体系中分别对载金硫化矿物(砷黄铁矿、黄铁矿)、金精矿3种矿物,采用电化学工作站,用矿糊电极法测试Tafel极化曲线、电化学阻抗谱(EIS),得到优化的浸出条件并进行浸出实验验证。结果表明,在KClO_(3)浸金体系中,上述矿糊电极的腐蚀反应主要受电荷转移控制;在相同的浸出体系下砷黄铁矿的氧化解离要优于黄铁矿;在KClO_(3)浓度为0.35 mol/L、温度为35℃、液固比为8:1、初始pH=12的条件下,金平均浸出率87.66%。电化学方法可为优化浸出条件提供支持。
The chlorate leaching of gold is a potential technical approach for processing Carlin-type refractory gold ores.In the chlorate gold leaching system,electrochemical workstation was employed to test Tafel polarization curves and electrochemical impedance spectroscopy(EIS)using mineral paste electrodes for three mineral types:gold-bearing sulfide minerals(arsenopyrite and pyrite)and gold concentrate.Optimized leaching conditions were determined and validated through leaching experiments.Results indicate that in the KClO_(3)gold leaching system:The corrosion reaction of these mineral paste electrodes is primarily controlled by charge transfer;Arsenopyrite demonstrates superior oxidative dissociation compared to pyrite under identical leaching conditions;Under optimized parameters(0.35 mol/L KClO_(3)concentration,35℃temperature,8:1 liquid-solid ratio,and initial pH=12),an average gold leaching rate of 87.66%was achieved.This study demonstrates that electrochemical methodologies can effectively support the optimization of leaching conditions.
作者
杨秀高
唐道文
邹涛
袁鑫
YANG Xiugao;TANG Daowen;ZOU Tao;YUAN Xin(College of Materials and Metallurgy,Guizhou University,Guiyang 550000,China)
出处
《贵金属》
北大核心
2025年第1期26-34,共9页
Precious Metals
基金
贵州省科技计划项目(黔科合基础[2019]1412)。
关键词
氯酸钾浸金
电化学
Tafel极化曲线
阻抗谱EIS
potassium chlorate leaching gold
electrochemistry
tafel polarization curve
impedance spectroscopy EIS
