METHOD OF PROCESSING TITANIUM-CONTAINING MINERAL RAW MATERIALS Russian patent published in 2020 - IPC C22B34/12 C22B3/04 C22B3/20 

FIELD: technological processes.

SUBSTANCE: invention relates to a hydrofluoride technology of processing titanium-containing mineral raw material, mainly ilmenite concentrate, and can be used in production of titanium dioxide with pigment purity, as well as iron oxide pigments. Method involves treatment of initial concentrate with solution of ammonium fluoride and/or ammonium hydrogen fluoride with heating, separation of obtained in solution fluoroammonium titanium salts from suspension of insoluble fluorine-ammonium iron salts, crystallization from ammonium hexafluorotitanate solution, its mixing with fine silicon dioxide of SiO₂ in stoichiometric ratio and subsequent pyrodihydrolysis of mixture in reactor with inner lining completely made of pressed silicon dioxide or fused quartz. Pyrodihydrolysis is carried out at stepped increase of temperature to 850–900 °C in steps of 50–100 °C and holding at each step for 20–60 minutes to obtain titanium dioxide.

EFFECT: obtaining titanium dioxide with purity of 99,5 % and whiteness of 93 standard units, as well as increasing service life of equipment with simultaneous reduction of contamination of obtained titanium dioxide by products of corrosion of reactor material.

3 cl, 2 ex