溶銑脱りんスラグにおける2CaO・SiO_2-3CaO・P_2O_5相の生成に関するモデル実験(<特集>マルチフェーズフラックスを利用した新精錬プロセス技術)

概要

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The formation of the Ca_2SiO_4-Ca_3P_2O_8 phase in a hot metal dephosphorization slag was investigated. The reaction of a P_2O_5-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 Ca_2SiO_4-Ca_3P_2O_8 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)・SiO_2-3(CaO+FeO)・P_2O_5 and their FeO concentration decreased as the progress of the reaction.
2009-03-01