Process for manufacturing titanium dioxide

Details Process for manufacturing titanium dioxide Process for manufacturing titanium dioxide

1980-10-29

1981-09-08

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423 82, 423 85, 423 86, C01G 23053

Patent

active

042884179

ABSTRACT:
A process is provided for the manufacture of titanium dioxide pigment wherein excess ilmenite ore is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight in the presence of an iron reductant, and in preferably at least two stages wherein the first stage is maintained at a temperature up to about 140.degree. C. and the second stage is conducted at a lower temperature (than the first stage) which is below about 100.degree. C. to provide a salt solution of titanium and iron. Thereafter, the titanium is hydrolyzed to provide titanium dioxide hydrate accompanied by recycling the spent acid from the hydrolysis for reaction with the ilmenite ore charged to the process. The titanium hydrate is calcined to provide titanium dioxide pigment.

REFERENCES:
patent: 1338473 (1920-04-01), Wrigley et al.
patent: 1504669 (1924-08-01), Blumenfeld
patent: 1504671 (1924-08-01), Blumenfeld
patent: 2617724 (1952-11-01), Espenschied
patent: 3071439 (1963-01-01), Solomka
patent: 3647414 (1972-03-01), Nilsen
patent: 3784670 (1974-01-01), Yamada et al.

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