辉银矿在硫脲体系中浸出银的热力学分析  

Leaching Thermodynamic Analysis of Argentite in Thiourea System

作　　者：吴争平[1] 尹周澜[1] 黄开国 胡天觉[2] 

机构地区：[1]中南工业大学化学化工学院,中国长沙410083 [2]湖南大学环境保护研究所,中国长沙410082

出　　处：《贵金属》2000年第4期29-33,共5页Precious Metals

摘　　要：对辉银矿在硫脲体系中浸出银进行热力学分析 ,建立硫化银在酸性硫脲体系中的溶解腐蚀电化学机理模型—原电池反应模型。推导出其氧化溶解过程 ,主要分两步 ,第一步是硫化银在酸性铁离子的作用下溶解。第二步是分解后银离子的络合。计算了反应过程中形成原电池的电动势E、反应吉布斯自由能ΔG等。对浸出反应过程中pH值对硫脲浸出体系的影响也进行了分析讨论。该研究为硫脲法从辉银矿中浸出银的实际生产工艺研究提供相应的理论基础。Based on the thermodynamic theory,the leaching principle of Ag from argentite(Ag 2S)in thiourea leaching system is reported in this paper.Reaction model of electric cell-electrochemistry mechanism model of argentite dissolving in acid thiourea leaching system is set up.The oxidizing and dissolving process contains two steps.The first is a dissolution of argentite acted by Fe 3+ ion in acid solution. The second is a complexation of Ag + ion with TU after decomposition. The electro-motive force of electric cell produced by reaction and ΔG are calculated.The effect of pH is analyzed.The study has provided a theory foundation with which we could study the practical production technology of leaching Ag from argentite in acid thiourea system.

关 键 词：辉银矿 硫脲浸取体系 热力学分析 硫化银 

分 类 号：TD953[矿业工程—选矿]