镁电解槽中制备镁稀土合金的电解工艺及机制研究  

Research on Parameters and Mechanism of Preparation of Mg-RE (Rare Earth) Alloy in a Magnesium-Electrolyzed Electrolyzer

作　　者：牛晓东[1,2] 邱鑫[1,2] 孙伟[1,2] 田政[1,2] 孟健[2] 安健[1] 

机构地区：[1]吉林大学材料科学与工程学院,吉林长春130025 [2]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《中国稀土学报》2013年第4期482-487,共6页Journal of the Chinese Society of Rare Earths

基　　金：高等学校博士学科点专项科研基金项目(20110061110031)资助

摘　　要：在模拟镁电解槽中,采用电解法制备出稀土含量<10%的镁稀土合金;研究了熔盐中RECl3和CaCl2的含量、电解温度和阴极电流密度对合金中RE含量和电流效率的影响。并采用循环伏安实验和还原实验研究电解制备镁稀土合金的机制。研究结果表明,电解制备镁稀土合金最佳的工艺条件为:熔盐中RECl3和CaCl2的含量分别为3%和10%(质量分数),电解温度为948 K,阴极电流密度约为8 A.cm-2。其电解过程机制为:阴极上只电解出金属镁,而后金属镁把稀土元素还原出来,形成镁稀土合金。A new process and mechanism for preparation of Mg-RE（Rare Earth） alloy containing less than 10%（mass fraction） RE in a magnesium-electrolyzed electrolyzer was described to simplify the preparation procedure and to economize energy source remarkably.The molten salts were composed of KCl,NaCl,CaCl2 and MgCl2.The other two chlorides,RECl3 and MgCl2,were used as feed to produce Mg-RE alloy.Four parameters influencing electrolysis,temperature,cathode current density,and the content of RECl3 and CaCl2 in molten salts,were modified to optimize the content of RE in alloy and the current efficiency.The results showed that the optimal electrolytic parameter is 948 K in temperature,about 8 A · cm-2 in cathode current density,and 3% RECl3 and 10%CaCl2 in content of molten salts,respectively.The mechanism for preparation of Mg-RE alloy is that only Mg2＋ is reduced on cathode,then Mg and RECl3 react to form Mg-RE alloy.

关 键 词：镁稀土合金 电解 镁电解槽 

分 类 号：TF822[冶金工程—有色金属冶金] TF845.6