Preparation of micaceous iron oxide by the oxidation of iron with pressurized oxygen in concentrated sodium hydroxide solution at elevated temperatures

S. Uchida, T. Sato, A. Okuwaki

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    8 Citations (Scopus)

    Abstract

    Iron powders were oxidized in NaOH solutions of 5-25 mol kg-1 at 403-563 K and 5 MPa of oxygen partial pressure. Various types and morphologies of iron compounds such as fine particles of Fe3O4, micaceous α-Fe2O3, and coagulated particles of α-NaFeO2 were formed depending on the experimental conditions. The observed critical concentrations of NaOH above which α-NaFeO2 was formed was in good agreement with those thermodynamically calculated for the hydrolysis equilibrium of α-NaFeO2.

    Original languageEnglish
    Pages (from-to)1332-1336
    Number of pages5
    JournalJournal of Materials Science
    Volume27
    Issue number5
    DOIs
    Publication statusPublished - 1992 Mar 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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