Working up aqueous titanium dioxide hydrate suspensions

Details Working up aqueous titanium dioxide hydrate suspensions Working up aqueous titanium dioxide hydrate suspensions

1975-05-14

1976-09-21

Stern, Edward

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423615, 423616, C01G 2304, C01G 2306, C01G 2308

Patent

active

039819787

ABSTRACT:
In the recovery of titanium dioxide by subjecting an aqueous titanium dioxide hydrate suspension to at least one stage of filtering and washing to form a washed filter cake, adjusting the composition and calcining the adjusted and washed filter cake, the improvement which comprises filtering the aqueous titanium dioxide hydrate suspension under a pressure of about 1 bar to 16 bars to form a homogeneous substantially crack-free filter cake of a thickness of about 10 to 25 mm. Advantageously a membrane filter is employed, and washing is effected under a pressure of 1 to 16 bars and a liquid flow rate of 0.1 to 1 m/h to produce a filter cake having a solids content of at least 45 % by weight.

REFERENCES:
patent: 2148283 (1939-02-01), Washburn
"Hackh's Chemical Dictionary," by J. Grant, 4th Ed., 1969, p. 77, McGraw-Hill Book Co., N.Y.
"Titanium," J. Barksdale, 2nd Ed., 1966, pp. 317-323, The Ronald Press Co., N.Y.
"Industrial Filtration of Liquids," 2nd Ed., 1971, pp. 278-279, by D. B. Purchas, Leonard Hill Books, London.

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