METHOD FOR PROCESSING OF TECHNOLOGICAL WASTE FROM THE PROCESSING OF COPPER ORE AND CONCENTRATES CONTAINING IRON

摘要

A method for processing of technological waste from the processing of copper ores and concentrates containing iron comprising: - preliminary leaching with a thinned solution of ammonium hydroxide, - leaching with oversaturated ammonium hydrogen oxalate solution with added alkali metal hydrogen oxalate salt at continuous bubbling of oxygen containing gas at 50 to 80°C for 1.5 to 3 hours; - filtering the suspension from the preceding step and precipitating the filtrate with ammonium hydroxide solution; - washing the precipitate with thinned solution of ammonium hydroxide and water; - drying. As a sole product resulting from the method is obtained ferrihydrite and the by-products of each step are processed additionally to obtain other useful products, including ferrosilicon.