METHOD OF PROCESSING TUNGSTEN CONCENTRATES Russian patent published in 2016 - IPC C22B34/36 C22B1/16 C22B3/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy of rare metals. Method of processing of tungstenite concentrates involves preparation of charge, its sintering and subsequent autoclave-soda leaching of sintering product. Charge is prepared by mixing tungstenite concentrate, rough commercial product in form of 4-7 % concentrate of primary flotation scheelite ore containing calcite 40-60 % and sodium carbonate in amount of 5 % of total weight of charge, and charge sintering is performed at 750-800 °C for 2-4 hours.

EFFECT: providing transfer of hard-to-extract tungstenite into easy-to-extract scheelite.

1 cl, 3 dwg, 1 ex