METHOD FOR PROCESSING TUNGSTEN CONCENTRATES Russian patent published in 2022 - IPC C01G41/02 C22B34/36 C22B3/44 

FIELD: tungsten pyrohydrometallurgy.

SUBSTANCE: invention relates to tungsten pyrohydrometallurgy, in particular, to a technology for extracting tungsten from scheelite CaWO₄ and wolframite FeWO₄ and MnWO₄ concentrates in the form of compounds that are commercial products, in particular, tungsten oxide WO₃. Tungsten concentrate is treated in the temperature range of 350-420°C for 3.0-3.5 hours at a mass ratio of concentrate: ammonium bifluoride: ammonium sulfate equal to 1:1.5-2.0:3.5-4.0, followed by cooling of the obtained product and its leaching by dissolving in water at S:L equal to 1:25, after which the insoluble precipitate is washed with an acidified aqueous solution.

EFFECT: method allows to simplify and reduce the number of processing steps while obtaining a high quality commercial product.

2 cl, 3 ex