1673Kにおける固体2CaO・SiO_2-FeO_x-CaO-SiO_2-P_2O_5スラグ界面でのりんの挙動(<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 role of 2CaO・SiO_2 phase on the formation of P_2O_5 condensed phase should be clarified to elucidate the microscopic dephosphorization mechanisms and to improve the hot metal dephosphorization efficiency by using CaO-based FeO_x-CaO-SiO_2-P_2O_5 multi phase flux. In the present study, solid 2CaO・SiO_2 piece was reacted with molten FeO_x-CaO-SiO_2-P_2O_5 slag for 1 to 60s at 1673K, and the reaction interface between solid 2CaO・SiO_2 and molten FeO_x-CaO-SiO_2-P_2O_5 slag was observed and analyzed by SEM and EDS. The dissolution of 2CaO・SiO_2 into the molten slag and the penetration of molten slag into solid 2CaO・SiO_2 simultaneously occurred. The 2CaO・SiO_2-3CaO・P_2O_5 was formed from solid 2CaO・SiO_2 and P_2O_5 in the slag. On the other hand, during the penetration of slag, the P_2O_5 in the slag reacted with 2CaO・SiO_2 to form 2CaO・SiO_2-3CaO・P_2O_5 phase. The P_2O_5 Content of 2CaO・SiO_2-3CaO・P_2O_5 phase existing in solid 2CaO-SiO_2 region was lower than that observed at the 2CaO・SiO_2 saturated liquid phase region because of the lower P_2O_5 content of penetrating slag than that of 2CaO・SiO_2 saturated liquid slag. The 2CaO・SiO_2 saturated liquid slag region and the region where P_2O_5 condensed phase was observed at the interface expanded with time.
2009-03-01