在相图分析的基础上,根据分子离子共存理论,建立了Fe-C-B三元熔体活度模型。通过对模型求解,可以计算出熔体中Fe、C、B、Fe3C、FeB、FeB2和B4C的组分活度。研究了硼酐碳热还原的热力学条件,分析了CO压力、B2O3含量及炉渣类型对冶炼所需最低温度的影响,常压下冶炼熔体中碳含量较高,温度需高于2 000℃才能脱碳保硼。CO气体压力为0.1kPa,CaO的质量分数小于60%时,可使冶炼硼铁的最低温度在1 600℃以下。
Based on the phase diagrams analysis,the activity model of Fe-C-B ternary system was established with the ion and molecule coexistence theory.The activities of Fe,C,B,Fe3C,FeB,FeB2 and B4C in melt were calculated by analyzing the model.The thermodynamic condition of boron oxide reducing with carbothermic method was investigated and the effects of CO partial pressure,B2O3 content and slag type on the lowest smelting temperature was also analyzed.In normal pressure,the carbon content is high in melt,so it needs 2 000 ℃ for decarbonizing and chrome remaining.When CO partial pressure is 0.1 kPa and CaO content is less 60%,the lowest temperature of smelting ferro boron could be below 1 600 ℃.
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