Process for producing iron oxide
AssigneeTDK Electronics Co., Ltd.
InventorShinji Umeki
Life of this patent
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Abstract
In a process for producing an iron oxide having magnetite as a main component by heating to reduce a powder of an oxide or a hydrated iron oxide comprising an iron oxide as a main component in an atmosphere for reduction, an improvement characterized in that said atmosphere for reduction is formed by passing an industrial liquefied nitrogen gas.
Claims2
In a process for producing an iron oxide comprising magnetite as the main component by heating goethite, lepidocrosite, .alpha.-iron oxide or .gamma.-iron oxide in a reducing atmosphere, the improvement comprising using as the reducing atmosphere an industrial liquified nitrogen gas consisting of nitrogen containing 2-100 ppm of CO, 2-100 ppm of CH.sub.4 and 2-100 ppm of H.sub.2 and conducting the heating at a temperature of about 600.degree. C.
Dependencies are inferred from the claim text.