Process for the production of titanium dioxide using aqueous fluoride
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United States of America Patent
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Aug 10, 2010
Grant Date -
Aug 7, 2008
app pub date -
Jan 16, 2006
filing date -
Jan 24, 2005
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Abstract
solution; (b) the aqueous dispersion thus obtained is filtered with consequent separation of a solid residue and an aqueous solution containing titanium salts; (c) the aqueous solution thus obtained is subjected to hydrolysis, the hydrolysis comprising a first stage at pH 7.0-8.5 and a second stage at pH 10.0-13.0; (d) the aqueous dispersion thus obtained is filtered and the solid residue is subjected to pyrohydrolysis, the pyrohydrolysis comprising a first stage at a maximum temperature of 450° C. and a second stage at a maximum temperature of 1000° C.
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