(1. 华北理工大学 矿业工程学院，唐山 063009；
2. 河北省矿业开发与安全技术重点实验室，唐山 063009；
3. 北京科技大学 金属矿山高效开采与安全教育部重点实验室，北京 100083；
4. 中冶华冶(北京) 国际贸易有限公司，北京 100029)
摘 要: 采用同时平衡原理对Au-I--H2O系的浸金热力学进行分析，分别研究溶液与固体Au以及AuI沉淀与固体Au平衡时的φ-pH关系、AuI存在条件和溶液中含金组分的变化规律。结果表明：随着溶液中含金组分的总浓度cT(Au)的降低或含碘组分的总浓度cT(I-)的增加，还原电位φsol/Au迅速降低，Au3+/Au2O3的平衡pH值增大，非常有利于金的碘化浸出；随着溶液中cT(I-)逐渐增加，出现AuI沉淀且其沉淀量呈先增大后减小的趋势；在cT(Au)为1×10-4 mol/L的条件下，当溶液中cT(I-)浓度大于0.0021 mol/L时，可避免AuI沉淀的生成，金主要以AuI2-络合离子形式存在。Au-I--H2O系的浸金热力学分析为金的高效碘化浸出提供了理论依据。
关键字: Au-I--H2O系；同时平衡原理；φ-pH图；AuI沉淀；热力学分析
（1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063009, China;
2. Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory, Tangshan 063009, China;
3. Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,
University of Science and Technology Beijing, Beijing 100083, China;
4. MCC Huaye (Beijing) International Trade Co., Ltd., Beijing 100029, China）
Abstract:Thermodynamic analysis of Au-I--H2O system was carried out based on the principle of simultaneous equilibrium. The φ-pH programs of balance with solution and Au, solid AuI and Au were investigated. Also, the existence condition of AuI precipitation and change-rule of gold-bearing components were studied. The results show that with decreasing cT(Au) or increasing cT(I-) in the solution, φsol/Au reduces rapidly compared to the standard potential of Au, and the balance pH value of Au3+/Au2O3 increases. This is beneficial to gold leaching with iodine-iodide. As the cT(I-) increases gradually in the solution, AuI precipitation appears and the trend of AuI precipitation amount increases firstly and then reduces. When the cT(Au) is 1×10-4 mol/L, if the cT(I-) is more than 0.0021 mol/L, AuI precipitation will not occur, meanwhile, the main complex ion is AuI2-. The thermodynamic analysis of Au-I--H2O system provides theoretical basis for the efficient gold leaching with iodine-iodide.
Key words: Au-I--H2O system; simultaneous equilibrium principle; φ-pH diagram; AuI precipitation; thermodynamic analysis
