TITANIUM-ENRICHED ILMENITE RESIDUE, ITS APPLICATION AND METHOD OF OBTAINING TITANIUM PIGMENT Russian patent published in 2014 - IPC C22B34/12 C01G23/53 C22B3/10 

FIELD: chemistry.

SUBSTANCE: claimed is titanium-enriched residue after leaching of ilmenite with hydrochloric acid as raw material for obtaining titanium-containing pigment by means of sulfuric acid method. Titanium enriched residue consists of friable and porous residue, obtained after removal of iron from crystal lattice of ilmenite (FeTiO₃) by leaching with hydrochloric acid, and metatitanic acid aggregates. Residue contains small amounts of retile and titanium augite, with larger part of constituting it TiO₂ being amorphous. Solid substance, obtained after leaching, is dried with formation of titanium-enriched residue. Residue is soluble in sulfuric acid, with water content in it constituting not more than 20%, with residue representing white, light-yellow or light-gray particles or powder, in which content of amorphous TiO₂ constitutes 65-97%, the total content of iron constitutes not more than 8%, and specific weight of residue constitutes 2.9-3.6.

EFFECT: obtaining titanium-containing pigment by means of titanium-enriched residue, which makes it possible to efficiently recycle finely disperse ilmenite of the region, obtain solution of titanium sulfate with super low ratio of iron to titanium dioxide (Fe/TiO₂) and double productivity of recycling equipment.

7 cl, 6 dwg, 12 tbl, 12 ex