During the past 30 years the gold leaching in thiosulphate media has attracted renewed interest of numerous researchers caused by fast kinetics in the presence of some oxidants/ligands and adaptability to carbonaceous and copper gold ores, inappropriate for direct cyanidation. The overall reaction of gold leaching is Au + Cu(II) = Au(I) + Cu(I). The paper presents a thermodynamic approach to studying mixed ligand complex formation reactions in the ammonia - thiosulfate aqueous system under real conditions. Its quintessence consists in the thermodynamic analysis of concurrent reactions in the system Au(I) - NH3 - S2O32- - H2O on the basis of the introduced notion of the generalized reaction equation (GRE). The formation of mixed ligand complex species is characterized usually by certain peculiarities in the behavior of two-phase heterogeneous systems.
Thermodynamic Speciation of Gold (I) in the Ammonia - Thiosulfate Aqueous System
Ubaldini S;
2018
Abstract
During the past 30 years the gold leaching in thiosulphate media has attracted renewed interest of numerous researchers caused by fast kinetics in the presence of some oxidants/ligands and adaptability to carbonaceous and copper gold ores, inappropriate for direct cyanidation. The overall reaction of gold leaching is Au + Cu(II) = Au(I) + Cu(I). The paper presents a thermodynamic approach to studying mixed ligand complex formation reactions in the ammonia - thiosulfate aqueous system under real conditions. Its quintessence consists in the thermodynamic analysis of concurrent reactions in the system Au(I) - NH3 - S2O32- - H2O on the basis of the introduced notion of the generalized reaction equation (GRE). The formation of mixed ligand complex species is characterized usually by certain peculiarities in the behavior of two-phase heterogeneous systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
