CaF_2对机械活化强化镁金属真空碳热还原反应的作用研究  

Study the effect of CaF_2 on carbothermic reduction of magnesium in vacuum by mechanical activation

作　　者：张腾[1] 杜双明[1] 牛立斌[1] 王明静[1] 蔡辉[1] 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054

出　　处：《轻金属》2015年第8期43-46,共4页Light Metals

基　　金：西安科技大学博士启动基金(项目编号:2014QDJ067);陕西省教育厅科研计划项目(项目编号:2013JK0900);陕西省科技统筹计划项目(项目编号:KTCQ1-17)

摘　　要：对Ca F2在机械活化强化镁金属真空碳热还原反应中的作用进行了研究。研究表明:与未经过机械活化的镁碳热还原反应相比,Ca F2不仅能对Mg-O化学键起到破坏作用;更重要的是经过机械活化后,Ca F2的晶粒度减小,活性和机械储能都得到了增强。这些变化进一步降低了该反应的活化能,加快反应速率。基于此,在1273K、真空度为1000Pa的条件下,对机械化活化后,反应时间、机械活化时间等因素对镁金属的真空碳热还原反应的影响做了进一步的实验研究。实验结果表明经过机械活化后,Ca F2对此反应的作用更为显著。并对Ca F2机械活化后对此反应的强化作用进行了分析和讨论。这些结果有望为新的镁金属冶炼工艺提供参考。The effect of CaF2 on strengthening carbethennic reduction in vacuum by the mechanical activation method is studied. The results show that the grain size of CaF2 is reduced, and the activity and mechanical energy storage have been enhanced after mechanical activation compared with magnesium metal carbothermic reduction in vacuum without mechanical activation. These changes reduce the activation energy of the reaction further, and accelerate the rate of the reaction. Based on these results, the effects of reaction time and the mechanical activation time on the reaction strengthening by the me- chanical activation method are investigated further under the condition of the vacuum degree of 1000Pa, 1273K. The experimental results indicate that the effect of CaF2 on the reaction is strengthened obviously after mechanical activation. Moreover, the mechanism of CaF2 strengthening the reaction after me- chanical activation is also discussed. These results can provide reference for the new preparation process of magnesium metal.

关 键 词：CAF2 机械活化 氧化镁 真空 碳热还原 

分 类 号：TG146.22[一般工业技术—材料科学与工程]