Process for the production of TiO.sub.2 pigments

Details Process for the production of TiO.sub.2 pigments Process for the production of TiO.sub.2 pigments

1990-10-31

1992-03-10

Langel, Wayne

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 82, 423 85, 423610, 423615, C01G 2305

Patent

active

050948342

ABSTRACT:
In the production of TiO.sub.2 pigments by the steps of digesting titanium-containing raw materials with sulfuric acid, hydrolyzing the titanyl sulfate obtained, separating the waste acid from the hydrolyzate, bleaching the hydrolyzate and calcining the hydrolyzate after addition of rutilizing nuclei and standardizing chemicals to form TiO.sub.2 pigments, and recovering sulfuric acid from the waste acid, the improvement which comprises employing as the rutilizing nuclei nuclei produced from part of the bleached and then washed hydrolyzate, which nuclei are added to the remainder of the bleached and washed hydrolyzate before calcination.

REFERENCES:
patent: 2479637 (1949-08-01), Olson
patent: 2488755 (1949-11-01), Aagaard et al.
patent: 2494492 (1950-01-01), Ross et al.
patent: 2507729 (1950-05-01), Myers
patent: 3862297 (1975-01-01), Claridge et al.
patent: 4073877 (1978-02-01), Klein

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