METHOD FOR EXTRACTING PRECIOUS METALS FROM REFRACTORY ORES AND CONCENTRATES

摘要

The method of extracting precious metals from resistant ores and concentrates can be used in hydrometallurgical industry in sulfide and resistant mineral raw materials processing. Method of extracting precious metals from resistant ores and concentrates involves the application of thiosulfate and complex compounds of transition metals as catalysts-oxidants for dissolution of precious metals. Natural fulvic and humic acids are used as organic complexing compounds, thiosulfate regeneration takes place directly in the pulp, by supplying with sulphite salts and sulfur dioxide gas simultaneously with the air or oxygen supplying. Either natural or artificial sulphides, or elementary sulphur specially added in the pulp are used as a source of sulfide-ion. The process of precious metals oxidation and compounds formation with thiosulfate and other organic and inorganic ligands is carried out using the short-period radicals formed directly in the solution due to interaction of reagents used.