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研究了埋弧炉锰铁生产中由ＭｎＯ－ＣａＯ－ＭｇＯ－ＳｉＯ２－Ａｌ２Ｏ３组成的标准炉渣。渣中Ａｌ２Ｏ３含量固定在５％。本研究目标集中在１５００℃时锰铁渣中ＭｎＯ的热力学活度上。为了达到校准的目的，在１３００、１４００和１５００℃时重新测定了Ｍｎ在Ｐｔ－Ｍｎ合金中的热力学活度。在１５００℃ＣＯ气氛下研究了碳饱和的Ｍｎ－Ｓｉ－Ｆｅ－Ｃ合金与ＭｎＯ－ＣａＯ－ＭｇＯ－ＳｉＯ２－Ａｌ２Ｏ３渣之间的平衡。在试验中发现，ａＭｎＯ值随着ＭｎＯ的增加而增大，趋向于随ＣａＯ／ＭｇＯ比的增大而增大。ａＭｎＯ值也随着碱度的增大而增大。在渣－金属平衡试验中，金属相中碳和硅的含量为反比关系。当硅含量一定时，由于Ｍｎ／Ｆｅ比增加，碳在金相中的溶解度增加。金属中含硅量随着渣中ＳｉＯ２含量的增加而增加．以及当ＭｇＯ代替渣中的ＣａＯ时，金属中含硅量增加。增大渣碱度使金属相含硅量降低。
The standard slag composed of MnO-CaO-MgO-SiO2-Al2O3 in the production of ferromanganese submerged arc furnace was studied. Slag Al2O3 content fixed at 5%. The aim of this study is to focus on the thermodynamic activity of MnO in ferromanganese slag at 1500 ℃. For calibration purposes, the thermodynamic activity of Mn in Pt-Mn alloys was re-measured at 1300, 1400 and 1500 ° C. The equilibrium between carbon-saturated Mn-Si-Fe-C alloy and MnO-CaO-MgO-SiO2-Al2O3 slag was investigated at 1500 ℃ CO atmosphere. In the experiment, it was found that the value of aMnO increased with the increase of MnO and tended to increase with the increase of CaO / MgO ratio. The value of aMnO also increases with increasing alkalinity. In the slag-metal balance test, the content of carbon and silicon in the metal phase is inversely proportional. When the silicon content is constant, the solubility of carbon in the metallographic phase increases due to the increased Mn / Fe ratio. The amount of silicon in the metal increases as the SiO2 content in the slag increases. And when MgO replaces CaO in the slag, the amount of silicon in the metal increases. Increase the slag alkalinity to reduce the silicon content of the metal phase.