METHOD OF MOLYBDENUM CONCENTRATE PROCESSING Russian patent published in 2012 - IPC C22B34/34 C22B1/04 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: concentrate is subjected to two-stage oxidising roasting. Note here that, before first stage, said concentrate is mixed with sulfur-binding additive to perform first roasting stage at 550-650°C for 15-30 min. Prior to second roasting stage, molybdenum concentrate is added to calcine produced at first stage in amount of 10-30 wt % from concentrate used in first roasting step. Second roasting is performed at 600-670°C for 30-40 min with subsequent leaching of molybdenum and rhenium from calcine obtained in first step.

EFFECT: higher yield of molybdenum.

2 tbl, 2 ex