Effect of MgO contents on the dissolution rate of alumina into molten CaO-SiO2-Al2O3-MgO slags

Shoichirou Taira, Akihiro Machida, Kunihiko Nakashima, Katsumi Mori

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    3 Citations (Scopus)

    Abstract

    Dissolution rates of sintered alumina into molten CaO-SiO2 -9mass%Al2O3-MgO(CaO/SiO2=0.80) slags were measured by a rotating specimen method. The dissolution rates into slags containing 5, 10, and 15mass% MgO were measured at 1773, 1823 and 1873K, and the revolution speed varied from 100 to 600 rpm. The microstructures of specimens after experiments were examined by an electron probe microanalyzer(EPMA), and the dissolution mechanism was discussed. The dissolution rate of alumina increased with increasing revolution speed and temperature. The dissolution rate of alumina into the slags containing more than 10mass% MgO were increased more rapidly with increasing revolution speed and temperatures, compared with that into the slag containing 5mass% MgO. The dissolution rate of alumina decreased with increasing MgO content up to 15mass%. According to the EPMA analysis, a deposition of MgO · Al2O3 spinel particles was observed in slag adjacent to the alumina specimen. The spinel particles formed a layer-in slags containing more than 10mass% MgO, and the thickness of the layer was increased with increasing MgO content in slags. These morphological differences of the spinel layers suggest that the spinel layers suppress the flow slag components, and the dissolution rate decreases with increasing MgO content. Moreover, the morphology of spinel layer was changed with revolution speed, this morphological change is considered to be the reason why the dependence of the dissolution rate on revolution speed differs by the MgO content in slag.

    Original languageEnglish
    Pages (from-to)1-6
    Number of pages6
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume82
    Issue number2
    Publication statusPublished - Dec 1 1996

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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