真空硅铜热还原制镁研究  

Preparation of magnesium by thermal reduction with silicon-copper alloy

作　　者：汪浩[1] 胡发平[1] 李文娟[1] 党春梅[1] 彭晓东[1,2] 谢卫东[1,2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044

出　　处：《兵器材料科学与工程》2012年第6期17-21,共5页Ordnance Material Science and Engineering

基　　金：国家973计划项目(2007CB613700);国家大学生创新性实验计划资助项目(1210611007)

摘　　要：对真空硅铜合金热还原制取金属镁进行热力学分析;分析冷凝条件对冷凝产物的影响及离析和反应时间对还原的影响。结果表明:以含硅30%硅铜合金为还原剂还原氧化镁,提高反应温度、延长反应时间可以提高还原率;当反应温度在1 573 K时,露点温度Td为968 K,可以获得结晶致密的产物镁;在1 473 K,10 Pa的反应条件下还原75 min,还原率可达85.4%,反应残渣主要为Ca2SiO4,残余铜可分离。Magnesium prepared by thermal reduction with silicon-copper alloys in vacuum atmosphere was thermodynamically analyzed and experimentally studied. The effect of condensing conditions on condensation products, and the effect of segregation and reduction time on reduction rate, were analyzed. The results show that the reduction rate increases with increasing reduction temperature and reduction time when the initial content ratio of Si is 30% （mass fraction） in silicon-copper alloy. The compact magnesium metal can be obtained when reduction temperature is 1 573 K, and dew point temperature is 968 K. The reduction rate is found to be 85.4% at 1 473 K for 75 rain. The reduction slag is mainly Ca2SiO4, and the copper can be easily separated from it.

关 键 词：镁 硅铜合金 真空 热力学 离析 

分 类 号：TF131[冶金工程—冶金物理化学]