Process for the production of titanium dioxide
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United States of America Patent
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Mar 19, 2013
Grant Date -
Feb 21, 2008
app pub date -
Sep 10, 2007
filing date -
Mar 22, 2004
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Abstract
It is disclosed a process for the production of titanium dioxide comprising the following steps:
- (a) a titanium ore containing iron, preferably ilmenite, is reacted with an aqueous NH4F solution;(b) the aqueous suspension thus obtained is filtered with consequent separation of a sludge fraction, which contains ammonium fluoroferrates, and a filtrate fraction, which contains ammonium fluorotitanates;(c) the filtrate fraction thus obtained is subjected to an hydrolysis reaction;(d) the thus-obtained solid component is subjected to a thermal hydrolysis reaction.
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