TECHNOLOGY OF UTILIZATION OF BY-PRODUCTS AND WASTE OF HYDROMETALLURGICAL PROCESSES Russian patent published in 2002 - IPC

FIELD: hydrometallurgical production of rare metals, specifically, wolfram and molybdenum ANHYDRIDES. SUBSTANCE: proposed technology includes thermal decomposition of by-products, their sintering with soda with use of waste carrying undecomposed mineral of wolfram and molybdenum with release of carbon dioxide. Technology provides for leaching of speck by water, precipitation of molybdenum sulfide from obtained solution with liberation of hydrogen sulfide, roasting of molybdenum sulfide with production of molybdenum anhydride and release of sulfurous anhydride. Wolfram compounds are precipitated from solution and then wolfram anhydride is won. Carbon dioxide released in process of sintering is subject to liquefaction, later hydrogen sulfide is converted to sulfurous anhydride and is subjected to liquefaction together with sulfurous anhydride liberated during sintering for further realization. EFFECT: possibility of utilization of by-products and decreased environmental pollution. 1 dwg, 1 tbl