METHOD OF PROCESSING SULPHIDE AND MIXED MOLYBDENUM-CONTAINING CONCENTRATES FOR EXTRACTION OF MOLYBDENUM AND RHENIUM Russian patent published in 2010 - IPC C22B34/34 C22B1/04 

FIELD: chemistry.

SUBSTANCE: method involves mixing concentrates with additives selected from MgO, MgCO₃, CaO, CaO₂, CaCO₃, BaO, BaO₂, BaCO₃ in amount of 100-120 % of the stoichimetrically required for bonding sulphur. The concentrates then undergo oxidising roasting at 450-650°C for 30-90 minutes and the obtained ash is leached with a solution of an alkali metal carbonate with concentration of 150-250 g/dm³. The alkali metal carbonate used is sodium carbonate or potassium carbonate. After leaching, molybdenum and rhenium are extracted from the solution.

EFFECT: higher extraction ratio of molybdenum with concomitant extraction of rhenium.

4 cl, 1 tbl, 1 dwg, 1 ex