溶融 Mn-Si 合金と CaO-SiO_2-MnO-CaF_2 系スラグ間のりんの分配平衡

概要

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Experiments were carried out to investigate the equilibrium distribution ratio of phosphorus (L_P) between CaO-SiO_2-MnO-CaF_2 melts and carbon saturated Mn-Si alloy as a function of oxygen partial pressure, alloy and slag compositions at 1300℃. The results demonstrate that L_P increases with increasing the basicity of slag, silicon concentration and oxygen partial pressure. In order to understand quantitatively the effect of silicon concentration on L_P, the phosphorus activity coefficient in Mn-Si alloys was measured and the interaction parameter, ε^<Si>_P in Mn at 1300℃ was found to be 10.7. The CaO equivalent of MnO for dephosphorization was found to be 0.4±0.1 in terms of weight percent. By measuring the manganese activity in Mn-Si alloy, the activity coefficient of MnO in the range of the present slag composition was calculated to be in the range of 0.42 to 0.62. The critical oxygen partial pressure between the stability of phosphate and phosphide in this slag system was about 10^<-18.4> atm at 1300℃.
社団法人日本鉄鋼協会の論文
1988-10-01