METHOD FOR SELECTIVE INTRADUMP CONCENTRATION OF ROCKS Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: method for selective intradump concentration of rocks includes formation of drainage, concentrated and leached layers of rocks laid on one another. The leached layer is treated with leaching solution. Productive metal solution from leached layer flows to concentrated layer where metals are selectively precipitated. Novelty consists in that concentrated layer is formed of argillaceous rocks, and metal precipitation takes place in alkali geochemical solution. Leached layer is formed from multicomponent metal-containing rocks. Alkali geochemical conditions are attained by treatment of leached layer, either, with alkali solution, or solution of weak carbonic, or boric, or phosphoric acid. EFFECT: higher efficiency. 6 cl, 1 dwg