METHOD OF METALS EXTRACTION FROM ORES AND CONCENTRATES Russian patent published in 2003 - IPC

FIELD: processing of uranium, thorium, rare-earth ores and concentrates, and also ores of nonferrous and noble metals. SUBSTANCE: method includes grinding of ores, leaching, extraction, metal reextraction, washing of discharge cake. Grinding is carried out by dry grinding up to particles sizing 0.1-1.0 mm. Leaching is conducted by mixing with concentrated acids with water content not in excess of 20%. Extraction is accomplished with solutions of extracting agent in ozone-safe incombustible solvent preliminarily saturated with acids up to concentration of 0.2-0.3g - equivalent/l. Discharge cane is washed with ozone-safe incombustible solvent with its subsequent evaporation. EFFECT: accelerated process, reduced reaction volumes and sewage water, and reduced capital outlays. 2 cl, 1 dwg, 2 tbl, 2 ex