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AssigneeKao Corporation
InventorsHiroyuki Nakamura, Yoshinori Hama, Shuhei Arikita, Shingo Ikeshita
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The present invention is directed to a method for a continuous mass-production, on an industrial scale at a high efficiency, of magnetic metal particles having excellent magnetic properties by preventing particle deformation and mutual sintering of the particles in a reduction process, and/or by preventing deterioration of the magnetic properties and unevenness in the properties, particularly in the saturation magnetization, upon oxidation in a stabilization process. In this method, an iron compound based on iron oxyhydroxide can be thermally dehydrated in a thermal dehydration process. These processes can be conducted using apparatuses of the present invention which have a gas flow reactor; a belt conveyor being installed in the reactor and having a gass-passable belt for transporting the material; a gas dispersion plate; and a heating means.
A method for producing magnetic metal particles wherein iron compound particles based on iron oxyhydroxide or iron oxide are thermally reduced with a reducing gas, comprising the steps of providing a closed gas flow reactor wholly enclosing a gas-passable conveying belt;
A method for producing magnetic metal particles, wherein iron compound particles based on iron oxyhydroxide or iron oxide are thermally reduced with a reducing gas, and then stabilized by a thermal gas-phase oxidation with an oxygen-containing gas, comprising the following steps (a) and (b):
A method for producing magnetic metal particles, wherein iron compound particles based on iron oxyhydroxide are thermally dehydrated with a non-reducing gas, then thermally reduced with a reducing gas, and further stabilized by a thermal gas-phase oxidation with an oxygen-containing gas, comprising the following steps (a)-(c):
Dependencies are inferred from the claim text.