TREATMENT METHOD OF MIXTURE OF NIOBIUM AND/OR TANTALUM AND TITANIUM OXIDES Russian patent published in 2014 - IPC C22B34/24 C22B34/12 C22B3/16 C22B3/28 

FIELD: metallurgy.

SUBSTANCE: treatment method of a mixture of niobium and/or tantalum and titanium oxides for separation of niobium and/or tantalum from titanium involves dilution of the mixture at heating in the hydrofluoric acid solution so that a fluoride solution is obtained. A tetramethylammonium hydroxide solution or its salt is added at mixing to the obtained fluoride solution and evaporated to dryness. Formed complex fluorides of niobium and/or tantalum and tantalum with a tetramethylammonium cation are treated by low-molecular aliphatic ketone for extraction of complex niobium and/or tantalum fluorides in the form of tetramethylammonium hexafluoroniobate and/or hexafluorotantalate to the solution. Tetramethylammonium hexafluorotitanate is obtained in the deposit.

EFFECT: increasing separation degree of niobium or tantalum from titanium; simplifying the method owing to reducing the number of stages and the time required for the separation process; reducing volumes of processed solutions.

8 cl, 9 ex