Process for the production of black iron oxide pigments
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United States of America Patent
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-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Aug 18, 2000
filing date -
Jan 26, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the production of a black iron oxide pigment from Fe.sub.2 O.sub.3 hematite iron oxide which may be an impure oxide produced by the 'Ruthner' process or by other means, or which may be a mineral hematite. The process may be used to upgrade poor quality synthetic or natural hematite, or to improve their performance as red pigments, by conversion to black pigment with subsequent oxidation of the magnetite so produced back to hematite. The process uses a low temperature aqueous slurry reaction in which the hematite is contacted with a soluble source of Fe(II) ions in the presence of a soluble source of Fe(III) ions in an aqueous alkaline medium to convert the same to Fe.sub.3 O.sub.4.
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