Theoretical research on vacuum separation of Au-Ag alloy  

金银合金真空分离的理论研究

作　　者：Shuang-ping WANG Jin-yang ZHAO Bao-qiang XU Ling-xin KONG Wen-long JIANG Bin YANG 王双平;赵晋阳;徐宝强;孔令鑫;蒋文龙;杨斌(昆明理工大学真空冶金国家工程研究中心,昆明650093;昆明理工大学冶金与能源工程学院,昆明650093;昆明理工大学复杂有色金属资源清洁利用国家重点实验室,昆明650093)

机构地区：[1]National Engineering Research Center for Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China [2]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China [3]State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2719-2726,共8页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.52064029);Yunling Scholarship of Yunnan Province Ten-Thousand Plan,China (No.KKRC201952012);Yunnan Province Ten Thousand Talents Program-Youth Top Talent Project,China (No.2018-73)。

摘　　要：To provide an accurate prediction of the product component dependence of temperature and pressure in vacuum distillation and give convenient and efficient guidance for the designing of the process parameters of industrial production, according to the molecular interaction volume model(MIVM), the separation coefficient(β) and vapor-liquid equilibrium composition of Au-Ag alloy at different temperatures are calculated. Combined with the vapor-liquid equilibrium(VLE) theory, the VLE phase diagrams, including the temperature-composition(T-x) and pressure-composition(p-x) diagrams of Au-Ag alloy in vacuum distillation are plotted. The triple points and condensation temperatures of gold and silver vapors are calculated as well. The results show that the β decreases and the contents of gold in vapor phase increase with the distillation temperature increasing. Low pressures have positive effect on the separation of Ag and Au. The difference between the condensation temperatures of gold and silver is about 450 K in the pressure range of 1-10 Pa.为准确预测金银合金真空蒸馏过程中产品成分与温度和压力的关系,并为工业生产参数的设计提供便捷和有效的指导,根据分子相互作用体积模型(MIVM),计算不同温度下金银合金的分离系数(β)和气−液平衡成分。结合气液相平衡(VLE)理论,绘制金银合金真空蒸馏的温度−成分、压力−成分相图。同时,对金、银三相点和金、银蒸气冷凝温度进行计算。理论研究结果表明:随着蒸馏温度的升高,分离系数减小,金在气相中的含量增加;低温对分离金银具有积极效果;在压强1~10 Pa范围内,金、银冷凝温度相差约450 K。

关 键 词：Au-Ag alloy vacuum separation molecular interaction volume model(MIVM) vapor-liquid equilibrium(VLE)phase diagram condensation temperature 

分 类 号：TF83[冶金工程—有色金属冶金]