2 層構造化によるペレットの耐軟化収縮特性の改善

概要

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The liquid phase formation process and its effect on softening and melting-down properties were investigated in a synthetic quinary MgO-Al_2O_3-SiO_2-CaO-iron oxide (or metallic Fe) system. The increase in CaO/SiO_2, MgO and also in T.Fe was found to be effective to improve the softening properties at the wustite reduction stage by increasing solidus temperatures and by reducing amount of liquid developed at solidus temperature, respectively. Even at reduction stage of metallic iron, where network of iron sustains the deformation stress, liquid formation in coexisting silicate phase was also found to affect the softening and melting-down behavior due to subsequent increase in mobility of iron atoms. Utilizing the topochemical nature of the reduction of iron ore pellet, softening and melting-down properties were found to be improved significantly by means of two-layered structure, where chemical compositions of the core and the shell parts are chosen to have as high solidus temperatures and also as little amount of liquid developed at the solidus temperature as possible at the reduction stage of wustite and metallic iron, respectively.
社団法人日本鉄鋼協会の論文
1982-12-01