Recycling of rare earth magnet scraps: Carbon and oxygen removal from Nd magnet scraps

被引：26

作者：

Saguchi, A ^{[1
]}

Asabe, K

Fukuda, T

Takahashi, W

Suzuki, RO

机构：

[1] Molycorp Inc, Wakayama Works, Wakayama 1850, Japan

[2] Sumitomo Met Ind Ltd, Corp Res Dev Labs, Amagasaki, Hyogo 6600891, Japan

[3] Sumitomo Met Ind Ltd, Technol Affairs Dept, Amagasaki, Hyogo 6600891, Japan

[4] Kyoto Univ, Dept Energy Sci & Technol, Kyoto 6068501, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 408卷

关键词：

permanent magnets; recycle; decarburization; deoxidation; induction melting;

D O I：

10.1016/j.jallcom.2005.04.178

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The decarburization and deoxidation technique for permanent Nd-Fe-B magnet scrap is investigated. The carbon and oxygen contamination damage the magnetic properties. The carbon content decreased less than 0.001% by heating in air. The two stage deoxidation is applied, iron oxides are reduced by heating in hydrogen thereafter rare earth oxides are removed by Ca-reduction and leaching. The appropriate conditions for deoxidation in the Ca-reduction and suppressing the re-oxidation in the leaching are investigated. The heating pattern in Ca-reduction and the leaching condition for the mixture composed of Ca compounds and Nd-Fe-B alloy powder greatly affects the oxygen content of recycled material. The decarburized and deoxidized Nd-Fe-B magnet scrap can be recycled as alloying elements by melting. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：1377 / 1381

页数：5

共 9 条

[1] Recycling of rare earth magnet scraps: Part I carbon removal by high temperature oxidation [J].