Process for preparing precipitated red iron oxides
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United States of America Patent
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-
Mar 17, 1981
Grant Date -
N/A
app pub date -
May 3, 1979
filing date -
May 3, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A precipitated red iron oxide, having high crystallinity, low acicularity, unifrom particle size, and purity of color, is produced by aerating an alkaline mixture of copperas and soda ash to form seed crystals, increasing the temperature, adding additional copperas, and aerating the mixture to form red oxide crystals of the desired color. The final color can vary from a light salmon to a dark maroon.
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