THE INFLUENCE OF FORMATION OF THE COMPLEXES WITH DIFFERENT SORTS OF LIGANDS ON THE KINETICS OF GOLD DISSOLUTION
The dissolution of gold in the presence of an oxidizer and a mixture of heterogeneous ligand-forming reagents was studied by the rotating disc technique. Kinetic regularities of dissolution in aqueous systems of thiourea-thiocyanate, thiourea-thiosulphate and thiosulfate-thiocyanate have been studied. It is considered the influence of the formation of mixed ligand gold complexes on the rate of metal dissolution. It is investigated the dependence of the velocity on the ratio of the concentrations of ligands and the nature of the oxidizer. The relationship is established: the use of heterogeneous ligand-forming reagents – higher thermodynamic stability of the heteroligand complexes of gold (relative to homoligand) – a synergetic increase in the dissolution rate of gold.