MgO 含有自溶性ペレットの焼成時における鉱物組織変化(<特集>製銑)

概要

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The changes of mineral phases in MgO-added self-fluxed pellets during indurating process, were investigated through quantitative analysis by means of EPMA and a microscopic observation. Sampled pellets with the variation of 0, 1, 2, and 4% of MgO contents and 0.5, 1.5, 2.0 of CaO/SiO_2 ratios, were made by laboratory-scale electric furnace at 1200, 1250, and 1300℃ of indurating temperature. The results are as follows : (1) Major change of mineral phase by adding MgO component to lime-fluxed pellets is the formation of a magnesio-ferrite phase. Forming amounts of magnesio-ferrite and MgO contents in this phase are increased or decreased respectively with the increase of CaO/SiO_2 ratio and indurating temperature. The chemical formula of this phase is showed as (Mg_<0.5∿0.8>・Fe_<0.2∿0.5>) Fe_2O_4 in pellet outer portion, and as (Mg_<0.3∿0.5>・Fe_<0.7∿0.5>) Fe_2O_4 in pellet center portion. (2) Mineral phases except iron oxide are a calcium ferrite and three kinds of slags with about 0.5, 1.0 and 1.4∿2.0 of CaO/SiO_2 ratio. The formation of these phases changes by CaO/SiO_2 ratio and indurating temperature. MgO and Fe_2O_3 contents in slag phases decrease with the increase of CaO/SiO_2 ratio of slag. MgO contents in calcium ferrite increase to 2.5∿3.0% by adding MgO component.
1980-11-01