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Electrorefining and Recycling of Magnesium

镁的电解精炼和回收

基本信息

批准号：
11225208
负责人：
TAKENAKA Toshihide
金额：
$ 14.72万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11225208/
关键词：
Mg rare earth metal molten salt molten chloride electrorefining recycling co-electrodeposition corrosion resisitivity La 電極反応不純物

项目摘要

The application of electrorefining process for the purification of Mg and for the recycling of Mg scrap has been studied in MgC12-NaCl-CaC12 and MgC12-NaCl-KCl molten salts. The electrochemical behaviors of Mg and impurity elements, such as Fe and Ni, were measured by voltammetry, and the necessary conditions of the electrorefining of Mg were deduced. The electrorefining of Mg was carried out on the basis of the result by the electrochemical measurement. By the process, impurity elements were removed from Mg metal effectively, and the suitable electrolysis condition was revealed. Because Mg alloys were purified by the electrorefining, this process can be applied for the recycling of Mg and its alloys. It was also shown that the more efficient electrolysis can be actualized by the so-caalled three-layer electrolysis where MgCu alloy was used as anode.Co-e1ectrodeposition of alloying elements, such as rare earth metal, with Mg has been also studied in the same molten salt system including rare earth metal chlorides. Rare earth metals were electrodeposited with Mg metal, and their contents can be controlled by the electrolysis conditions, such as the concentration of their chloride in the salts. The Mg metal including the same amount of rare earth metals as those by electrolysis showed good corrosion-resistivity. It is concluded that the co-electrodeposition of rare earth metals with Mg can be available for the production of Mg alloy.

本文研究了MgCl_2-NaCl-CaCl_2和MgCl_2-NaCl-KCl熔盐电解精炼工艺在镁提纯和废镁回收中的应用。用伏安法测定了镁及杂质元素Fe、Ni的电化学行为，并推导出镁电解精炼的必要条件。根据电化学测试结果进行了镁的电解精炼。该工艺有效地去除了金属镁中的杂质元素，并确定了适宜的电解条件。由于镁合金是通过电解精炼净化的，因此该工艺可以应用于镁及其合金的回收。本文还研究了在含稀土金属氯化物的熔盐体系中，镁与稀土等合金元素的共电沉积。稀土金属与金属镁电沉积，其含量可以通过电解条件控制，例如其氯化物在盐中的浓度。含有与电解法相同量的稀土金属的金属镁显示出良好的耐腐蚀性。结果表明，稀土金属与镁的共电沉积可用于镁合金的生产。