| 摘要 |
PURPOSE:To manufacture iron oxide having excellent magnetic characteristics by heating for reduction (hydrated) oxide containing iron oxide as the main component in an atmosphere consisting of a reductive organic compound gas or vapor, an inert gas, and water vapor. CONSTITUTION:A precursory raw material, composed of a hydrated iron oxide, e.g., goethite, lepidcrocite, etc., alpha-iron oxide, a sinter inhibitor, and a coercive force improver, is set in a reductive furnace. Then, an inert gas is blown into a solution consisting of a reductive organic compound, e.g., ethanol, acetone, etc., and water to generate a mixed gas containing the organic compound gas or vapor, the inert gas, and water vapor. Then, the mixed gas thus generated is introduced into the reductive furnace and heated to reduce the (hydrated) oxide containing iron oxide as the main component in order to obtain a magnetite-dominated iron oxide. Thus, a magnetite powder which is high in chemical stability as well as excellent in sintering proofness and magnetic characteristics can be obtained even under a high-temperature reductive condition. |
