Calcining effect of synthetic iron oxide
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United States of America Patent
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-
Sep 9, 1980
Grant Date -
N/A
app pub date -
Mar 23, 1979
filing date -
Mar 23, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Copperas solution is purified and mixed with a silica-containing material, such as fumed silica. The mixture is then dried to give a monohydrate (FeSO.sub.4.H.sub.2 O)/silica material. Calcination of this substance results in a copperas red oxide having improved color characteristics and lower losses due to uncalcined sulfate. The amount of silica added is 0.25-10 wt. %, based on the finished oxide product.
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