Purification of Rare Earth Metals by Solid State Electrotransport Processing

通过固态电传输处理纯化稀土金属

• 批准号: 05555198
• 负责人: YAMAUCHI Chikabumi
• 金额: $ 11.01万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555198/
• 关键词: Solid State Electrotransport; Yttrium; Oxygen; Purification; Rare Earth Metal

As a part of a series of the purification of the rare earth metals by the solid state electrotransport (SSE) processing, the experimental studies were conducted. Yttrium was selected as a rare earth metal, and oxygen as the impurity.1.The SSE purification apparatus was built, which can be used for the SSE processing of the very chemically active rare earth metals.2.Oxygen content in yttrium was analyzed by the inert gas fusion infrared absorptiometric method. The most suitable conditions of the oxygen analysis were determined ; flux is Platinum, the addition>50mol% and extraction temperature=2873K.3.Oxygen in yttrium transported toward the anode by SSE processing, therefore the cathode side was purified.4.The electrotransport properties (eg.effective valence Z^*, delta(=eEZ^*/kT)) were measured. The effective valence of oxygen in yttrium increased with increasing oxygen content.delta decreased linearly with increasing temperature. The mobility of oxygen in yttrium increased with increasing temperature.5.The diffusion coefficient of oxygen in yttrium was also determined in the temperature range from 1173 to 1563 K by the SSE processing.6.From the viewpoint of the industrialization, the experimental studies were also conducted using a large scale specimen. Comparing this experimental result with the information of 4., the problems which would be encountered in the industrialization were pointed out.

作为固态电迁移（SSE）工艺提纯稀土金属系列研究的一部分，进行了实验研究。以钇为稀土金属，以氧为杂质，建立了SSE净化装置，可用于化学活性很高的稀土金属的SSE处理;采用惰性气体熔融红外吸收法分析钇中的氧含量。确定了氧分析的最佳条件：助熔剂为Pt，加入量>50mol%，萃取温度= 2873 K。3. SSE处理使钇中的氧向阳极迁移，从而净化了阴极侧。钇中氧的有效价态随氧content.delta的增加而增加，随温度的升高而线性下降.氧在钇中的迁移率随温度的升高而增加。5.利用SSE法测定了1173 ~ 1563 K温度范围内氧在钇中的扩散系数。6.从工业化的角度出发，利用大型试样进行了实验研究。将该实验结果与4.的信息进行比较，指出了产业化过程中可能遇到的问题。