マグネシア・クリンカーにおける酸化鐵の鑛化作用について (その2)

概要

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The microstructure of the magnesia clinker, which was obtained from the light burned magnesia or chemical pure magnesia mixed with 0-10% Fe2O3 as mineralizer and fired 1300-1600°C in 3 hours, was studied.Fe2O3 is as well effective to sintering of magnesia clinker as to developement of periclase crystal, and it is found that Fe2O3 is uniformly distributed within the periclase grain.The periclase crystal is effectively developed when CaO, Fe2O3 content, firing temperature, firing time are increased and ignition loss of a raw magnesia is decreased.Especially, in the case of raw magnesia which containing CaO, the periclase crystal was very large and shows a characteristic structure like a hive.Microstructure of magnesia clinker, such as a sort of periclase crystal, distributed state of anisotropic substance, quantity of a silicate matrix and air void, produced compound, must be dependent chiefly on chemical composition and mutual proportion of CaO, Fe2O3 and SiO2 in the mixture.
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