Process for the production of ti02 pigments

Details Process for the production of ti02 pigments Process for the production of ti02 pigments

C - Chemistry, Metallurgy

01

G

23/263

C01G 23/053 (2006.01) C01G 23/08 (2006.01) C09C 1/36 (2006.01)

Patent

CA 2030386

In the production of TiO2 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 hydroly-zate and calcining the hydrolyzate after addition of rutilizing nuclei and standardizing chemicals to form TiO2 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.

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