Process for the preparation of titanium dioxide

Details Process for the preparation of titanium dioxide Process for the preparation of titanium dioxide

1990-05-14

1993-07-20

Lewis, Michael

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423610, 423615, C01G 2304, C22B 3410

Patent

active

052290875

ABSTRACT:
A process for the preparation of titanium dioxide by the sulphate process in which titanium raw materials are decomposed with sulphuric acid, the resulting titanyl sulphate is hydrolyzed, the waste acid is separated from the hydrolyzate and evaporated to a concentration of 60 to 70%, sulphuric acid is separated from the solid metal sulphates, and the sulphuric acid which has been concentrated by evaporation is used again for the decomposition of the titanium raw material, the improvement wherein the 60 to 70% sulphuric acid is concentrated to 70 to 80% H.sub.2 SO.sub.4 in a further evaporation stage and the concentration of a part of this sulphuric acid is raised to a concentration of 98 to 99% H.sub.2 SO.sub.4 by the absorption of SO.sub.3 and then used together with the remainder of the above-mentioned 70 to 80% sulphuric acid for the decomposition of titanium raw materials.

REFERENCES:
patent: 1655940 (1923-04-01), D'Ans et al.
patent: 2098056 (1937-11-01), McBerty
patent: 3210156 (1965-10-01), Zirngibl
patent: 4119698 (1978-10-01), Zimmer et al.

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