Method for purifying iron oxide
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Sep 8, 1992
filing date -
Nov 22, 1990
priority date (Note) -
Expired
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Abstract
A method is described for purifying iron oxide, for example, in the form of magnetite or hematite slime, which preferably contains quartz as the impurity. The method comprises calcinating the iron oxide together with alkali carbonate and thereafter leaching with a weak aqueous solution of an acid or a mixture of acids.
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