A METHOD FOR CATALYTIC OXIDATION OF REFRACTORY GOLD CONCENTRATE WITH HIGH CONTENTS OF SULFUR AND ARSENIC UNDER ORDINARY PRESSURE

摘要

An atmospherically catalyzing and oxidizing method of refractory goldconcentrate with high arsenic and highsulfur, comprises ~ adding predefined ore, solid catalyst, acid and water intoreaction container with stirrers to form ore pulp; ~continuously introducing gas oxidizer such as ozone and oxygen, or ozone andair into the pulp at 60-100°C, continuously stirringthe mixture to form oxidized ore pulp, reacting for 6 to 18 hrs, then coolingto room temperature and filtering; ~ In accordancewith traditional extracting and filtering process, mixing the residue from thefiltering step with calcium hydroxide solution toregulate its pH value to 11 ~ 12, adding sodium cyanide, stirring for 24 hrs,and filtering to extract noble metals from filtrate. Themethod improves the extraction rate of noble metals such as gold and silver inthe refractory gold concentrate while reducing theenvironment pollution.