METHOD FOR PROCESSING MOLYBDENITE CONCENTRATES Russian patent published in 1994 - IPC

FIELD: chemical technology. SUBSTANCE: during processing standard molybdenite concentrate two-stepped treatment of pulp is carried out, ratio of solid and liquid phases is so that concentration of sulfuric acid in pulp after said treatment is not more 250 g/l. Mentioned above treatment rakes place at 150- 250 C, technical oxygen is fed at partial pressure 0.5-1 MPa, waste gas phase being exhausted of autoclave. If products of poor quality are processed then portion of oxygen solution is recycled at the first step to maintain final activity of sulfuric acid at level 150-250 g/l. Degree of isolation of molybdenum and rhenium is 98-99% and 95-96% respectively. EFFECT: increases degree of isolation of desired products, improves efficiency of the method. 2 cl, 1 dwg, 1 tbl