磁场作用下熔盐电解Li2CO3制备铝锂母合金过程电化学机理研究

项目名称： 磁场作用下熔盐电解Li2CO3制备铝锂母合金过程电化学机理研究

项目编号： No.51204094

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 李继东

作者单位： 辽宁科技大学

项目金额： 25万元

中文摘要： 铝锂合金作为一种低密度、高弹性模量、高强度和高比刚度的理想结构材料而广泛应用于航空航天及国防太空等领域。熔盐电解液态合金化法制备合金具有浓度均匀、金属烧损率小、生产连续易控制和低成本等优点。 本项目采用LiF-KF-Li2CO3新型电解质体系，以石墨为阳极，磁场中旋转的铝液为阴极，熔盐电解Li2CO3制备铝锂合金。以更为廉价的Li2CO3代替氯化物为原料，使槽电压下降的同时也降低了电耗，更缩减了阳极气体净化成本。通过外加磁场在电解过程中的复合搅拌作用，促进Li2CO3的热分解与放电过程，加速析出Li的扩散及合金相的生成。本课题通过电化学测试研究方法重点研究CO32-在电解过程中的放电机理及磁场变化对电解参数与合金浓度的影响，明确电极过程动力学参数，找到最佳的电解工艺参数，为该工艺的应用奠定理论基础。

中文关键词： 熔盐电解；铝锂合金；碳酸锂；放电机理；

英文摘要： Now, Al-Li alloys with low density, high modulus of elasticity, high strength and high specific rigidity are ideal material which have been widely used in the field of aviation, national defense and outer space and so on. The preparation of alloys by fusion electrolysis with liquid alloying have many excellences with uniform alloy concentration, small burning loss of metal, low cost and continuous production by easier controlling. In this item, Al-Li alloys were prepared with Li2CO3 by fusion electrolysis in a new mixture of LiF-KF-Li2CO3 using graphite as anode, revolving liquid aluminum in magnetic field as cathode. We use cheap Li2CO3 instead of chloride as raw material, which dose not only lower cell voltage and power consumption but also reduce the cost of cathode gas purification. With mixing action of additional magnetic field during electrolysis, it accelerates Li2CO3 thermal decomposition and discharge process, it also makes the metal lithium diffuse into aluminum and alloy phase formation easier. We will adopt electrochemistry test method to study the discharge mechanism of CO32- in electrolysis and the influence of changing magnetic field on electrolysis parameter and alloy concentration emphatically in order to make sure kinetic parameter in electrode process and find the optimal electrolysis techno

英文关键词： molten salt electrolysis；Al-Li alloy；Li2CO3；discharge mechanism；