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 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/SiO
2 ratio and indurating temperature. The chemical formula of this phase is showed as (Mg
0.50.8·Fe
0.20.5) Fe
2O
4 in pellet outer portion, and as (Mg
0.30.5·Fe
0.70.5) 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 1.42.0 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 2.53.0% by adding MgO component.
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