中文摘要：

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Fe_2O_3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

英文摘要：

Thermodynamic calculation and analysis results show that in ordinary pressure the reaction temperature （T） of carbon-thermal reduction for MgO is 1 854 22 , 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.