CaO-SiO_2-Fe_2O_3系スラグにおけるP_2O_5のダイカルシウムシリケートと液相スラグ間の固液分配(<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)

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In most cases, the slag used in hot metal dephosphorization exists in a solid-liquid coexisting state, containing dicalcium silicate as the solid phase. It is known that dicalcium silicate (C_2S) and tricalcium phosphate (C_3P) form a solid solution with a wide range of composition. A large distribution ratio of P_2O_5 between a solid solution and liquid slag phases has also been reported. To clarify the maximum concentration of P_2O_5 in this solid solution phase, the measurement of the distribution ratio of P_2O_5 in slag containing a high concentration of P_2O_5 is performed in this research, and the influence of MgO and MnO on the distribution ratio is investigated. CaO-SiO_2-Fe_2O_3 slag containing a maximum of 18% P_2O_5 is melted at 1873K and cooled to 1673K at a cooling rate of 10K/min. During cooling, the solid solution of dicalcium silicate and tricalcium phosphate precipitates from the liquid slag. A good relation is found between the distribution ratio of P_2O_5 and (T. Fe); this relation is independent of slag composition and P_2O_5 content. The concentration of P_2O_5 in the solid solution is strongly influenced by the mixing ratio of P_2O_5 and the slag composition. It is clarified that if the slag composition is controlled adequately, the concentration of P_2O_5 in the C_2S-C_3P solid solution can be increased up to 100% of C_3P. The change in the distribution ratio with the addition of MgO and MnO is not large.
社団法人日本鉄鋼協会の論文
2009-03-01

CaO-SiO_2-Fe_2O_3系スラグにおけるP_2O_5のダイカルシウムシリケートと液相スラグ間の固液分配(<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)

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