Process for the preparation of pigment grade iron oxides from ferrous sulphate and the resulting Fe.sub.2 O.sub.3 pigments
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United States of America Patent
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Apr 14, 1981
Grant Date -
N/A
app pub date -
Oct 2, 1979
filing date -
Oct 4, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Pigment grade Fe.sub.2 O.sub.3 is prepared from ferrous sulphate by a roasting process. The ferrous sulphate, partly dehydrated and granulated, is partially converted to the oxide by roasting. After elimination of soluble constituents by washing with water, the oxide is subjected to pigmentary calcination and then crushed and optionally micronized. This process makes it possible to prepare red pigments of excellent quality characterized particularly by pure tints ranging from orange-red to purplish-red. The oil absorptions are especially low. Low toxic impurity concentrations permit the use of these pigments in foodstuffs.
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