Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Changes of Mineral Phases in MgO-added Self-fluxed Pellets during Indurating Process
Osamu TSUCHIYATakeshi SUGIYAMAMamoru ONODAIsao FUJITA
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JOURNAL FREE ACCESS

1980 Volume 66 Issue 13 Pages 1830-1839

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Abstract

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/SiO2 ratios, were made by laboratory-scale electric furnace at 1 200, 1 250, and 1 300°C 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/SiO2 ratio and indurating temperature. The chemical formula of this phase is showed as (Mg0.50.8·Fe0.20.5) Fe2O4 in pellet outer portion, and as (Mg0.30.5·Fe0.70.5) Fe2O4 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 1.42.0 of CaO/SiO2 ratio. The formation of these phases changes by CaO/SiO2 ratio and indurating temperature. MgO and Fe2O3 contents in slag phases decrease with the increase of CaO/SiO2 ratio of slag. MgO contents in calcium ferrite increase to 2.53.0% by adding MgO component.

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© The Iron and Steel Institute of Japan
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