New experimental data are reported on the liquidus and sub-liquidus phase equilibria in the FeO-Fe2O3-CaO-SiO2 system in air. The study was undertaken using equilibration/quenching and microanalysis techniques enabling the compositions of the liquid and solid phases in equilibrium at temperature to be accurately measured. The limits of stability and associations of the primary phase fields of hematite (Fe2O3), dicalcium silicate (Ca2SiO4), silico-ferrite of calcium solid solution (SFC), dicalcium ferrite (Ca2Fe2O5), calcium ferrite (CaFe2O4), calcium diferrite (CaFe4O7) have been characterized in the high iron, high CaO/SiO2, low melting temperature region of the system. The full extent of the primary phase field of SFC has been determined, as have the conjugate lines joining the SFC and the corresponding liquid phase over the range of SFC compositions at sub-liquidus temperatures.

中文翻译：

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空气中 FeO-Fe2O3-CaO-SiO2 系统的实验相平衡研究：富铁地区的结果

报告了空气中 FeO-Fe2O3-CaO-SiO2 系统液相线和亚液相线相平衡的新实验数据。该研究是使用平衡/淬火和微量分析技术进行的，能够准确测量在温度下处于平衡状态的液相和固相的组成。赤铁矿 (Fe2O3)、硅酸二钙 (Ca2SiO4)、铁酸钙固溶体 (SFC)、铁酸二钙 (Ca2Fe2O5)、铁酸钙 (CaFe2O4)、铁酸钙 (CaFe4O7) 的主相场的稳定性和缔合极限) 已在系统的高铁、高 CaO/SiO2、低熔化温度区域进行表征。已确定 SFC 初级相场的全部范围，