カオリナイトと酸化鉄 (II) の高温での固相反応の機構論的研究

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  • Mechanistic Study of Solid-State Reaction between Kaolinite and Ferrous Oxide at High Temperatures.

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Mechanistic study of solid-state reactions occurring in a mixtured body of kaolinite and Fe2O3 heated in a reducing atmosphere was performed.<br>In the case of oxidizing firing, mullite formation started at 1300°C, whereas in the case of reducing firing, mullite, hercynite and quartz solid solution were formed at 950°C. Concentration analyses by ESCA combined with the Ar etching treatment of Al, Si and Fe in the surface layer of the mixture body fired at 1100°C in the reducing atmosphere revealed that migration of Al toward FeO grains occurred. Also taking thermodynamic calculation also into consideration, following reaction schemes for the formation of quartz solid solution and mullite were postulated.<br>(1) FeO reacted with Al2O3 in both the Al2O3-rich spinel phase and the SiO2-rich amorphous phase resulting from the phase separation of metakaolin, and formed hercynite.<br>(2) The Al extraction ability combined with the mineralizing action of FeO caused the crystallization of quartz solid solution from the SiO2-rich phase. Mullite formation from the spinel phase (SiO2⋅6Al2O3) was also due to Al extraction by FeO.

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