难浸金精矿生物浸出体系的电位-pH图分析  

Analysis of Potential-pH Diagrams for Refractory Gold Concentrate Bio-leaching Systems

作　　者：李超[1,2] 张祉倩[1] 李宏煦[1,2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]稀贵金属绿色回收与提取北京市重点实验室,北京100083

出　　处：《黄金科学技术》2014年第2期77-82,共6页Gold Science and Technology

基　　金：国家自然科学基金重点项目"铁铝复合矿中非铁元素分离与提取新工艺的基础研究"(编号:51234008)资助

摘　　要：电位-pH图是一种重要的热力学分析方法,能够直观地反映出浸出体系中的各种热力学平衡,有助于推断出物质发生化学反应的趋势,在难处理金精矿生物浸出体系中有重要指导作用。通过热力学计算,针对生物浸出环境绘制并分析了313 K温度下,pH=0-7.0,E=-1.2-1.2 V范围内适宜生物氧化黄铁矿—水系、毒砂—水系的电位-pH图。结果表明：在酸性体系下黄铁矿的稳定区域存在于0.336 V以下,毒砂则为0.133 V以下,毒砂的稳定性比黄铁矿的稳定性低,在较低的电位条件下便会被氧化溶解。Potential-pH （Eh-pH） diagram is an important means for thermodynamic analysis,it can reflect the various thermodynamic equilibriums in directly ways and help to determine the trends of chemical reactions.So the Eh-pH diagram plays an important guiding role in biological leaching refractory gold concentrate.In this article,the Eh-pH diagrams of FeS2-H2O,FeAsS-H2O system under the condition of 313 K,pH=0~7.0,E=-1.2~1.2 V were drawn by thermodynamic calculation and analyzed briefly.Results indicated that the stability zone of pyrite and arsenopyrite was respectively under potential of 0.336 V and 0.133 V in acidic solution,which means that arsenopyrite would be oxidized and dissolved at low potential.

关 键 词：电位-PH图 难处理金精矿 生物浸出 热力学分析 

分 类 号：TF18[冶金工程—冶金物理化学]