METHOD OF PRODUCTION OF TITANIUM DIOXIDE Russian patent published in 2008 - IPC C22B34/12 C22B3/08 C01G23/53 

FIELD: sulfate method of production of titanium dioxide from titanium-containing material.

SUBSTANCE: proposed method includes leaching-out of titanium-containing materials with sulfuric acid solution for obtaining lye, deposition of ferrous sulfate from lye, extraction of titanyl sulfate from lye by means of solvent, hydrolysis of extracted titanyl sulfate followed by roasting of solid phase obtained at hydrolysis stage. At least part of raffinate from extraction stage is used as part of leaching solution at initial leaching-out stage.

EFFECT: high degree of purity of titanium dioxide; reduced amount of acid; reduced power requirements.

20 cl, 2 dwg, 9 tbl, 13 ex