机械活化作用下MgO-CaO硅热还原反应的反应热力学分析及实验研究  

Thermodynamic analysis and experiment research of MgO-CaO silicothermic reduction reaction by using mechanically activated method

作　　者：张腾[1] 王苗[2] 牛立斌[1] 杜双明[1] 孙万昌[1] Zhang Teng;Wang Miao;Niu Libin;Du Shuangming;Sun Wanchang(School of Material Science and Engineering,Xian University of Science and Technology,Xian 710054,China;School of Metallurgy and Engineering,Xian University of Architecture and Technology,Xian 710055,China)

机构地区：[1]西安科技大学材料学院,陕西西安710054 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《轻金属》2019年第9期45-48,共4页Light Metals

基　　金：陕西省教育厅专项科研计划项目(17JK0490)

摘　　要：针对传统镁生产工艺存在的资源消耗量大、还原周期长、还原过程中废料污染等问題,本文首先对机械活化作用下MgO-CaO与Si粉的还原反应热力学进行分析和计算,并在常压和1223K条件下,采用机械活化法对MgO-CaO与Si粉的热还原反应进行强化。对该反应的热力学计算分析结果表明硅钙氧化物最可能的形式为Ca2SiO4和Ca3SiO5;实验结果表明机械活化对MgO的硅热还原反应具有很好的强化作用,在该实验条件下成功制得镁金属。对还原产物进行了XRD、SEM和能谱分析,在此基础上对该还原反应的反应机理进行了分析和讨论。In order to solve the problem of large consumption of resource, long period of reduction and serious environment pollution in the magnesium extraction process, the thermodynamic analysis and calculation were firstly carried out for the reduction reaction between MgO-CaO and Si powder after the mechanical activation, then the mechanical activation methcxl was used to enhance the silicothermic reduction reaction between MgO-CaO and Si powder at 1223 K and normal pressure. The thermodynamic calculation results demonstrate that the silicon calcium oxide is mostly likely in the form of Ca2SiO4 and Ca3SiO5, and the experiment results show that the mechanical activation has a good reinforcement effect on the MgO silicothermic reduction reaction, and magnesium was successfully prepared under the experiment condition. Moreover, the reaction mechanism of the reduction reaction was discussed based on analysis of the reduzate using XRD, SEM and Energy Dispersive Spectrometer analysis method.

关 键 词：反应热力学 机械活化 MGO 还原反应 反应机理 

分 类 号：TF111[冶金工程—冶金物理化学] TF822