TUNGSTENITE CONCENTRATE PROCESSING METHOD Russian patent published in 2012 - IPC C22B34/36 C22B3/12 

FIELD: metallurgy.

SUBSTANCE: method involves decomposition of concentrate with alkali liquor in presence of oxidiser for oxidation of ferrous iron and manganese. Then, sodium tungstate solution is obtained and processed. As oxidiser there used is nitric-acid sodium and/or potassium salt taken with excess of 20% from the theoretically required quantity for oxidation of iron and manganese. Decomposition of concentrate is performed by means of water solution of sodium hydroxide with concentration of 25-30% at temperature of 130-140°C. The reaction mass obtained during decomposition is leached with water so that solution of sodium tungstate is obtained.

EFFECT: possibility of processing both of rich and poor tungstenite concentrates with high penetration degree without specifying any special requirements for their crushing quality.

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