碳粉还原MgO的动力学──MgO的还原挥发行为(Ⅱ)  

Behavior of Reduction and Volatilization of MgO at High Temperatures Ⅱ. Kinetics of Reduction of MgO by Carbon Powder

作　　者：黄振奇[1] 戴桓[1] 杨祖磐[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2002年第5期444-446,共3页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目 (0 0 2 0 5 4) .

摘　　要：为解决硼镁矿在高炉冶炼过程中 ,因镁循环富集而产生结瘤的问题 ,研究了碳粉还原MgO的动力学·采用恒温热重法 ,在高纯氩气氛下 ,测定了MgO +C在不同温度下的失重·用Doyle Ozawa法和Kissinger法 ,解析实验所获得的Δm -t热重曲线数据 ,计算出反应的表观活化能为 2 9 0 4 6kJ/mol,表观频率因子为 0 0 6 1·The ludwigite containing MgO to 14%～25%, in which the content of MgO is much higher than in common iron ore, is a unique iron ore in China. MgO can be reduced by carbon or CO to be transformed into magnesium vapor at the high temperatures. The gaseous magnesium can be reoxidized when it flows upwards, which is a great hidden trouble in the process in blast furnace. Weight loss of the system of MgO+C at different temperatures were examined by thermogravimetry in the atmosphere of highly pure argon. The experimental results were interpreted by Doyle Ozawa and Kissinger methods. It is shown that the apparent activation energy of the reaction of MgO+C is 29 04?kJ/mol and the apparent frequency factor is 0 061.

关 键 词：碳粉 MGO 还原挥发 动力 热重 活化能 高炉冶炼 硼镁铁矿 氧化镁 

分 类 号：TF53[冶金工程—钢铁冶金]