酸性体系下不同成因黄铁矿的浸出行为与电化学性质差异  

Difference in Leaching Behavior and Electrochemical Properties of Pyrite with Different Genetic Mineralogy in Acidic Medium

作　　者：邓莎 顾帼华[2] 贺国帅 DENG Sha;GU Guo-hua;HE Guo-shuai(School of Resources Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Shaanxi Metallurgical Design&Research Institute Co Ltd,Xi′an 710032,Shaanxi,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]陕西冶金设计研究院有限公司,陕西西安710032

出　　处：《矿冶工程》2021年第1期85-89,共5页Mining and Metallurgical Engineering

基　　金：陕西省自然科学基础研究计划(2020JQ-666);国家自然科学基金(51374249);国家重点基础研究发展计划(973计划)项目(2010CB630903);湖南省研究生科研创新项目(CX2018B064)。

摘　　要：以同沉积型黄铁矿和中温热液型黄铁矿为研究对象,考察了酸性培养基体系下2种不同成因黄铁矿的浸出行为和电化学性质。浸出试验结果表明:同沉积型黄铁矿浸出率为7.59%,而中温热液型黄铁矿浸出率仅为3.68%,同沉积型黄铁矿的浸出活性高于中温热液型黄铁矿。电化学试验结果表明:黄铁矿的矿物学成因不改变它的电化学溶解机制;同沉积型黄铁矿具有较高的费米能级、较低的Tafel腐蚀电位及电子传递阻抗,因此其电化学氧化活性高于中温热液型黄铁矿,从电化学角度解释了同沉积型黄铁矿的浸出速率高于中温热液型黄铁矿的原因。The syndepositional and mesothermal pyrite were taken for research to investigate their leaching behavior and electrochemical properties of pyrite with different genetic mineralogy in acidic culture medium.The leaching result shows that the leaching rates of syndepositional pyrite and mesothermal pyrite were 7.59%and 3.68%,respectively,indicating that the leaching activity of syndepositional pyrite is higher than that of mesothermal pyrite.The electrochemical test result reveals that the genetic mineralogy of pyrite does not bring any influence to its electrochemical dissolution mechanism,but syndepositional pyrite has a higher level of Fermi energy,lower corrosion potential by Tafel extrapolation and electron transfer impedance.Therefore,syndepositional pyrite is more active than mesothermal pyrite in terms of electrochemical oxidation,which can explain why the leaching rate of syndepositional pyrite is higher than that of mesothermal pyrite from an electrochemical point of view.

关 键 词：黄铁矿 同沉积型黄铁矿 中温热液型黄铁矿 酸性培养基 浸出 电化学 

分 类 号：TF18[冶金工程—冶金物理化学]