酸化鉄酸化アルミニウムで被覆した石灰石の焼成反応過程

抄録

The new process to produce calcium ferrite system, calcium aluminate system and calcium alumino ferrite system fluxes for steel making were examined. These fluxes were obtained by calcination of Fe₂O₃ -coating, Al₂O₃ -coating and Fe₂O₃-Al₂O₃ mixture coating limestone. The products were characterized by means of X-ray diffraction, scanning electron microscope and energy-dispersion X-ray spectrometry.
As a result of experiment, calcium ferrite (2CaO·Fe₂O₃), calcium aluminate (3CaO·Al₂O₃ and 12CaO·7Al₂O₃) and calcium alumino ferrite (4CaO·Al₂O₃·Fe₂O₃) could be synthesized same time with calcium oxide. Besides, fluxes were stuck on or penetrated into calcium oxide. Calcium alumino ferrite system flux was particularly penetrated to insides of calcium oxide. Formation of Fe-rich C₄AF or C₄AF-C₂F solid solution were important to promote its penetration.