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    • 3. 发明专利
    • PREPARATION OF FINE MAGNESIA POWDER HAVING HIGH PURITY
    • JPS60161327A
    • 1985-08-23
    • JP1575884
    • 1984-01-31
    • UBE INDUSTRIES
    • KOBAYASHI KAZUICHIYOSHIDA KOUZABUROUNISHIDA AKIO
    • C04B35/04C01F5/04
    • PURPOSE:To obtain fine MgO powder having high purity and extremely small particle size by specifying conditions for generating Mg vapor and for bringing the Mg vapor into contact with O2 in a process for prepg. MgO by allowing Mg vapor generated by heating Mg to contact O2. CONSTITUTION:Metallic Mg 5 is charged in a retort 3 installed in an evaporating section A and is heated in an electric furnace 2 to evaporate Mg 5 in an atmosphere of Mg vapor. Generated Mg vapor is fed to an oxidation reaction section B where it is allowed to contact with O2 in the gas supplied to the reaction section B through a gas feeding duct 6. In this stage, the partial pressure of O2 in the O2-contg. gas is adjusted to >=2 times the partial vapor pressure of Mg, and the reaction temp. is held at 1,200-2,000 deg.C, and the Mg vapor is exhausted from an exhausting port 4 and is allowed to contact with O2-contg. gas fed from the duct 6 in parallel flow to oxidize Mg to MgO. Generated fine MgO powder is sucked by an exhaust gas pump 9 and collected by a filter 7 in a collecting section C while shielding air with a cover 8. By this method, fine MgO powder having high purity and