METHOD FOR PRODUCING TITANIUM DIOXIDE Russian patent published in 2017 - IPC C01G23/47 B82B3/00 

FIELD: chemistry.

SUBSTANCE: method for producing titanium dioxide comprises heating titanyl sulfate and ammonium while gradually raising the temperature and heat treatment at 600-700°C with forming the gaseous phase containing a sulphate and an ammonium compounds and the solid phase in the form of anatase titanium dioxide, to provide the sulfate compound content in the anatase titanium dioxide based on the sulfur trioxide SO₃ in an amount of 1.5-3.0 wt % with respect to TiO₂. The obtained anatase titanium dioxide is subjected to mechanical activation in a ball grinder with the drum rotation speed of 600-750 rev/min, at the ratio of the balls weight to the anatase weight of 1:10-18 within 0.5-1.5 hours. The activated product is afterwards calcined at a temperature of 800-900°C, with obtaining rutile titanium dioxide.

EFFECT: obtaining nanosize titanium dioxide with the stable rutile structure and reduced content of volatile compounds.

3 cl, 4 ex