METHOD FOR EXTRACTING METALS FROM FINE-GROUND CLAY-SLUDGE ORE AND TECHNOGENIC RAW MATERIAL Russian patent published in 2002 - IPC

FIELD: mining industry, metallurgy. SUBSTANCE: method involves charging basic raw material in column onto false bottom; supplying leaching solution from the bottom into column; upon introducing required amount of leaching solution at liquid : solid ratio of (0.25-0.5) : 1, interrupting supplying of leaching solution. As a result of processing basic material with leaching solution, productive solution and sludge are obtained. Method further involves washing sludge with ascending flow of washing solution and simultaneously displacing leaching solution, with flow speed of leaching and washing solutions being below basic material fluidizing rate. In case of complex metal extraction, basic material is processed with two or more leaching solutions supplied one after another. EFFECT: reduced consumption of leaching solution, increased concentration of useful components in productive solution. 4 cl, 1 dwg, 4 tbl