Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 32    No. 8    August 2022

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Theoretical research on vacuum separation of Au-Ag alloy
Shuang-ping WANG1,2*, Jin-yang ZHAO1,2*, Bao-qiang XU1,2,3, Ling-xin KONG1,2,3, Wen-long JIANG1,2,3, Bin YANG1,2,3

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

Abstract: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.

 

Key words: Au-Ag alloy; vacuum separation; molecular interaction volume model (MIVM); vapor-liquid equilibrium (VLE) phase diagram; condensation temperature

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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