MgO 飽和 Na_2O-Fe_tO-SiO_2-P_2O_5 系および CaO 飽和 Fe_tO-SiO_2-P_2O_5 系スラグ-溶鉄間のりんの分配平衡

概要

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In order to meet the recent demand for low phosphorus steels, highly basic slags must be used to increase the refining efficiency. The purpose of this study is to obtain the information of the thermo-dynamic property of phosphorus in basic slag melts. In this study, the equilibrium distribution ratio of phosphorus (L_P) between MgO-saturated Na_2O(-CaO)-Fe_tO-SiO_2-P_2O_5 slags and molten iron was measured as a function of temperature, slag composition and pertial pressure of oxygen. As a result, the CaO equivalent of Na_2O in basicity was found to be 2.3 in terms of mole fraction. Since CaO-saturated Fe_tO-SiO_2-P_2O_5 slags are also expected to have great capacity of dephosphorization, the distribution ratio of phosphorus between slags and molten iron was measured at 1600℃ together with the influence of additional Na_2O or MgO on the phosphorus distribution. As expected, both components did slightly enhance dephosphorization within the concentration range used in this study.
社団法人日本鉄鋼協会の論文
1987-06-01