【摘要】 在实验室条件下研究了高温下碳酸钠挥发及碳酸钠与铁碳合金系中铁和碳反应产生烟尘的机理。分析表明,在高温下碳酸钠挥发主要是按以下二式进行的:Na₂CO₃（1）=2Na（g）+CO₂+（1/2）O₂2Na（g）+CO₂+（1/2）O₂=Na₂CO₃碳酸钠与铁反应时产生的烟尘量极少。碳酸钠与碳的反应是铁水预处理时引起 Na₂CO₃损失的主要原因。在空气下烟尘生成反应为:Na₂CO₃（1）+2[C]=2Na（g）+3CO2Na（g）+CO+O₂=Na₂CO₃2Na（g）+CO₂+（1/2）O₂=Na₂CO₃在 Ar 气氛下则按以下反应进行:Na₂CO₃（1）+2[C]=2Na（g）+3CO2Na（g）+3CO=Na₂CO₃+2C更多还原

【Abstract】 The mechanism of dust production due to vaporization of Na₂CO₃ with Fe and C in Fe—C Alloys at elevated temperatures were investi— gated under experimental conditions Analysis showed that at elevated temperatures the vaporization of Na₂CO₃ behaved fundamentally along the following stages: Na₂CO₃（1）=2Na（g）+ CO₂+1/2O₂ 2Na（g）+CO₂+1/2O₂=Na₂CO₃（s） the amount of dust produced is very littie during the reaction of Na₂CO₃ with solid iron The vaporization loss of Na₂CO₃ during pretreatment of hot metal with Na₂CO₃ is caused fundamentally by the reaction of Na₂CO₃ with the carbon in hot metal.In atmosphere the reactions of dust production can be expressed as follows: Na₂CO_3（1）+2C = 2Na（g）+3CO 2Na（g）+ CO+O₂:Na₂CO_3（s） 2Na_（g）+CO₂+1/2O₂ = Na₂CO_3（s） Wblie in Ar atmosphere it follows the following equations: Na₂CO_3（1）+2C=2Na_（g）+3CO 2Na_（g）+3CO=Na₂CO_3（s）+2C更多还原