Distribution of P2O5 between Solid Dicalcium Silicate and Liquid Phases in CaO–SiO2–Fe2O3 System
Distribution of P2O5 between Solid Dicalcium Silicate and Liquid Phases in CaO–SiO2–Fe2O3 System
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DOI：
10.2355/isijinternational.49.505
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发表时间：
2009-04
影响因子：
1.8
通讯作者：
Ken-ichi Shimauchi;S. Kitamura;H. Shibata
中科院分区：
文献类型：
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作者：
Ken-ichi Shimauchi;S. Kitamura;H. Shibata
在大多数情况下，铁水脱磷中使用的炉渣含有饱和硅酸二钙 (C2S)，并包含两相：固态 C2S 和液态。众所周知，C2S 和磷酸三钙 (C3P) 在多种组成范围内形成固溶体。据报道，P2O5 在固溶体和液态渣相之间的分配比非常高。为了确定固溶体中 P2O5 的最大可能浓度，本研究测定了高浓度 P2O5 渣中 P2O5 的分配比，并考察了 MgO 和 MnO 对分配比的影响。含有高达 18% P2O5 的 CaO-SiO2-Fe2O3 炉渣在 1873 K 下熔化，然后以 10 K/min 的速率冷却至 1673 K。冷却过程中，C2S和C3P固溶体从液渣中析出。发现P2O5 分配比与T·Fe 含量之间存在线性关系，与石灰/二氧化硅比和P2O5 含量无关。相反，固溶体中 P2O5 的浓度受石灰/二氧化硅比率和 P2O5 含量的强烈影响。如果P2O5含量足够高，并且控制T·Fe含量以呈现高分配比，则固溶体中C3P的浓度可以提高到100%。添加 MgO 和 MnO 后，分配比没有观察到显着变化。
In most cases, the slag used in hot metal dephosphorization is saturated with dicalcium silicate (C2S) and contains two phases—solid C2S and liquid. It is known that C2S and tricalcium phosphate (C3P) form a solid solution over a wide range of composition. The distribution ratio of P2O5 between the solid solution and the liquid slag phase has been reported to be very high. In order to determine the maximum possible concentration of P2O5 in the solid solution, the distribution ratio of P2O5 in slag containing a high concentration of P2O5 was measured in this study, and the influence of MgO and MnO on the distribution ratio was also investigated. CaO–SiO2–Fe2O3 slag containing up to 18% P2O5 was melted at 1873 K and then cooled to 1673 K at a rate of 10 K/min. During cooling, the solid solution of C2S and C3P precipitated from the liquid slag. A linear relationship, which was independent of the lime/silica ratio and P2O5 content, was found to exist between the distribution ratio of P2O5 and the T·Fe content. On the contrary, the concentration of P2O5 in the solid solution was strongly influenced by the lime/silica ratio and P2O5 content. If the P2O5 content was high enough and the T·Fe content was controlled to show the high distribution ratio, the concentration of C3P in the solid solution can be increased to 100%. No significant change was observed in the distribution ratio upon the addition of MgO and MnO.