黄铁矿对硫砷铜矿化学浸出的促进作用  

Effect of pyrite on chemical leaching of enargite

作　　者：伍赠玲[1,2,3] WU Zeng-ling(College of Zijin Mining, Fuzhou University, Fuzhou 350108, China;State Key Laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores, Zijin Mining Group Co., Ltd., Xiamen 361101, China;Xiamen Zijin Mining & Metallurgy Technology Co., Ltd., Xiamen 361101, China)

机构地区：[1]福州大学紫金矿业学院,福州350108 [2]低品位难处理黄金资源综合利用国家重点实验室,厦门361101 [3]厦门紫金矿冶技术有限公司,厦门361101

出　　处：《中国有色金属学报》2018年第11期2376-2382,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51504071;51474075)~~

摘　　要：为了考查黄铁矿对硫砷铜矿浸出的影响,在添加黄铁矿、常压化学浸出条件下研究硫砷铜矿的浸出动力学和电化学。采用自制浸出装置在H_2SO_4-Fe_2(SO_4)_3体系中开展混合矿物化学浸出实验。结果表明:添加黄铁矿后硫砷铜矿的表观活化能降低至48.15kJ/mol;随着黄铁矿加入比例的升高,硫砷铜矿的浸出率逐渐提高,当硫砷铜矿与黄铁矿质量比为1:6时,12天硫砷铜矿的浸出率可达23.6%。通过XPS分析了混合矿物表面化学浸出前后硫和砷形态的变化,加入黄铁矿后促进砷转化为五价砷,降低毒性。电化学工作站测定硫砷铜矿的静止电位为0.48 V,无菌条件下的电化学行为解释了黄铁矿和硫砷铜矿混合化学浸出时形成原电池,促进了硫砷铜矿的溶解。In order to investigate the effect of pyrite on enargite leaching,the leaching kinetic and electrochemistry of enargite and pyrite mixture by chemical leaching under the condition of atmospheric pressure were studied.Leaching experiments of enargite and pyrite mixture in H2SO4-Fe2(SO4)3 system were investigated by leaching experimental device.The results show that the activation energy of enargite is decreased to 48.15 kJ/mol,while enargite leaching is increased by the addition of pyrite.Enargite leaching is increased dramatically up to 25% after 12 days with the proportion of enargite to pyrite equaled to 1:6.The morphological changes of sulfur and arsenic of mixture before and after leaching were demonstrated by XPS.Arsenic is promoted to transfer to pentavalent arsenic,which means less toxic.The rest potential of enargite is detected to 0.48 V by the electrochemical workstation.Electrochemical behavior explains the galvanic effect of chemical leaching of enargite and pyrite mixture,which promotes the dissolution of enargite.

关 键 词：硫砷铜矿 黄铁矿 化学浸出 静电位 原电池效应 

分 类 号：TF11[冶金工程—冶金物理化学] TF811