METHOD OF PRODUCING TITANIUM DIOXIDE Russian patent published in 2009 - IPC C01G23/53 C09C1/36 C22B34/12 C22B3/44 C01G49/06 

FIELD: chemistry.

SUBSTANCE: invention can be used in production of titanium dioxide when processing material which contains titanium and iron, for example ilmenite concentrates. The method of producing titanium dioxide involves the following steps: (a) reacting iron-containing titanium ore with an aqueous solution of NH₄F at temperature 100-120°C, pressure of 1-2 bars and pH of approximately 6.5-7.0; (b) filtering the obtained aqueous suspension with subsequent separation into a precipitate fraction which contains ammonium fluoroferrates, and a filtrate fraction which contains ammonium fluorotitanates; (c) hydrolysis of the obtained filtrate fraction thereby obtaining a solid component which is ammonium fluorooxotitanate; (d) thermal hydrolysis of the solid component obtained at step (c).

EFFECT: high degree of utilisation of raw material, high output and whiteness of the product, as well as simplification of the process and reduction of amount of wastes.

17 cl, 4 dwg