Method for producing powdered iron oxide
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United States of America Patent
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Jul 16, 1991
Grant Date -
N/A
app pub date -
Dec 16, 1988
filing date -
Oct 17, 1988
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Expired
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Abstract
A method for producing a powdered iron oxide comprises the steps of adjusting the pH of a crude iron chloride solution to 2.5-4.5; reducing the P content of the solution by mechanical stirring or air bubbling and filtering; and oxidizing the solution into a powdered iron oxide having a maximum P content of 0.005 wt. %. The P content of the solution may also be reduced by ultrafilter treatment. The soft ferrite made by using the powdered iron oxide by this process shows excellent magnetic properties.
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