The Model Experiment on the Formation of 2CaO·SiO2–3CaO·P2O5 Phase in the Dephosphorization Slag

The formation of the Ca2SiO4–Ca3P2O8 phase in a hot metal dephosphorization slag was investigated. The reaction of a P2O5-containing slag with a solid porous CaO was observed at 1673K by using a hot thermo-couple method. A CaO–FeO layer was formed near the interface, and next to it a solid solution...

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Bibliographic Details
Published in:Tetsu to hagane 2009/03/01, Vol.95(3), pp.236-240
Main Authors: Kami, Masayuki, Terasawa, Masahiro, Matsumoto, Atsushi, Ito, Kimihisa
Format: Article
Language:Japanese
Subjects:
dephosphorization
dicalcium ferrite
dicalcium silicate
multi-phase flux
slag
tricalcium phosphate
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Summary:The formation of the Ca2SiO4–Ca3P2O8 phase in a hot metal dephosphorization slag was investigated. The reaction of a P2O5-containing slag with a solid porous CaO was observed at 1673K by using a hot thermo-couple method. A CaO–FeO layer was formed near the interface, and next to it a solid solution of Ca2SiO4–Ca3P2O8 containing FeO was observed. The results could be explained in terms of the model proposed by Hamano et al. The Fe–P–Si alloy was reacted with dicalcium ferrite at 1673K, and the samples were analyzed by XMA. The phosphorus concentrated phases were observed near the slag–metal interface. Their compositions could be approximated as 2(CaO+FeO)·SiO2–3(CaO+FeO)·2O5 and their FeO concentration decreased as the progress of the reaction.
ISSN:0021-1575
1883-2954
DOI:10.2355/tetsutohagane.95.236