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 Fe
2O
3 -coating, Al
2O
3 -coating and Fe
2O
3-Al
2O
3 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·Fe
2O
3), calcium aluminate (3CaO·Al
2O
3 and 12CaO·7Al
2O
3) and calcium alumino ferrite (4CaO·Al
2O
3·Fe
2O
3) 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 C
4AF or C
4AF-C
2F solid solution were important to promote its penetration.
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