Abstract: Thermodynamic calculation and analysis results show that in ordinary- pressure the reaction temperature (T) of carbon-thermal reduction for MgO is 1 854 °C, it is difficult under hot metal pre-treatment condition to realize situ desulfurization by generating magnesium from magnesite-based desulfurizer. As carbon-thermal reduction occurs at 1 250 ~ 1 300 ℃， the vapour pressure of magnesium must be less than 0. 994 kPa, moreover at 1 350 〜1 400℃, the vapour pressure of magnesium should be less than 1. 004 kPa. In thermodynamics adding aluminum powder and Fe2O3 as thermite is available to carry out the carbon-thermal reduction and accelerate the magnesium vapor generation.

摘要： 热力学计算和分析表明,常压下碳还原MgO的反应温度(7)为1854℃,难以实现菱镁矿基在铁水预处理条件下生成镁原位脱硫。当碳热还原反应在1250～1300℃发生时,镁蒸气的压强需小于0.994 kPa;在1350～1400℃时,镁蒸气压需小于1.004 kPa。铝粉和Fe₂O₃可作为发热剂加入,在热力学上有利于碳热还原反应的进行,达到加速镁蒸气的生成

关键词: 菱镁矿, 铁水预脱硫, 碳热还原温度, 发热剂, 热力学分析