Dissolution Behavior of Al_2O_3 and MgO Inclusions in the CaO-Al_2O_3-SiO_2 Slags : Formation of Ring-like Structure of MgAl_2O_4 and Ca_2SiO_4 around MgO Inclusions




    • PARK Jin-Hong
    • GIFT, Pohang University of Science and Technology (POSTECH)
    • JUNG In-Ho
    • Research Institute of Industrial Science and Technology (RIST)
    • LEE Hae-Geon
    • GIFT, Pohang University of Science and Technology (POSTECH)


The dissolution behavior of Al<sub>2</sub>O<sub>3</sub> and MgO particles in various CaO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> slags was investigated using a confocal scanning laser microscope at 1 550°C. The dissolution paths of Al<sub>2</sub>O<sub>3</sub> and MgO particles varied depending on slag compositions. Reaction products such as CaO·6Al<sub>2</sub>O<sub>3</sub>, CaO·2Al<sub>2</sub>O<sub>3</sub> and Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub> formed on the surface of Al<sub>2</sub>O<sub>3</sub> particle. Surprisingly, however, in the case where reaction products were MgAl<sub>2</sub>O<sub>4</sub> and Ca<sub>2</sub>SiO<sub>4</sub> phases, these reaction products formed ring-like structure around MgO particles. Inside of the ring-like structure, liquid phases of which compositions correspond to the co-saturation compositions with MgO and MgAl<sub>2</sub>O<sub>4</sub> (Ca<sub>2</sub>SiO<sub>4</sub>) phases. In addition, this unique dissolution phenomenon retarded the dissolution rate of MgO particle in molten slags. In the present study, the dissolution mechanism of this unique dissolution phenomenon is proposed.


  • ISIJ international

    ISIJ international 46(11), 1626-1634, 2006-11-15

    The Iron and Steel Institute of Japan

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