中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 Special 1 May 2010 |
（1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. Research Center of Metallurgical Engineering and Technology of Shaanxi Province,
Xi’an University of Architecture and Technology, Xi’an 710055, China）
Abstract:The concentrations of S2O32− and SO32− were measured in gold leaching systems, including thiosulfate system, polysulfide system and the modified lime sulfur synthetic solution (ML) system in the process of chemical reaction. The interactions among S2O32−, SO32− and S2− were discussed. The behavior mechanism of sulfur-bearing reagents was proposed to describe the process reactions and their Gibbs free energy. The proper quantity oxygen and SO32− reduce decomposition of S2O32− and react with sulfur derived from the decomposition of SX2−. So, SO32− ions have action to stabilize sulfur-bearing system and are favorable to leach gold.
Key words: sulfur-bearing system; gold leaching; thermodynamics
