Recovery of Titanium IV Oxide

Recovery of Titanium (IV) Oxide (NH4)2[TiF6] + 4NH3 + 2H20 - Ti02 + 6NH4F 

Concentrated (15 M) aqueous ammonia is diluted with an equal volume of water, and about 5% more than the theoretical quantity is placed in a polyethylene beaker. This solution is stirred vigorously, either manually or with a plastic-coated magnetic stirrer, and the clear fluoride solution from procedure B is added drop by drop. The resulting finely divided, white precipitate is removed by filtering, and the filter cake is washed by slurrying with water and refiltering. The washed filter cake is about 80% water and represents 65 to 75% of the initial titanium-(IV) oxide content of the mineral. 

Hydrous titanium(IV) oxide so obtained is nongelatinous and readily soluble in acids. It is represented as 7-Ti02. Either the wet product or a material obtained by drying 

Hampel, Chap. 24, Reinhold Publishing Corporation, New York, 1954. 

Dean and B. Silkes U.S. Bur. Mines, Inform. Circ. 7381, Novem- 

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