New recycling process of care earth metals using the formation of oxyhalide
利用卤氧化物的形成来回收稀土金属的新工艺
基本信息
- 批准号:12555206
- 负责人:
- 金额:$ 5.89万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In this study, direct extraction and separation of neodymium (Nd) metal from Nd-Fe-B magnet scraps, using molten silver and magnesium, were investigated for the purpose of developing a new recycling process.Firstly, we examined the direct extraction of Nd metal from Nd-Fe-B magnet scraps using molten silver (Ag) as an extraction medium. Prior to the extraction experiment, the phase equilibrium of the system Ag-Fe-Nd was investigated to estimate the theoretical extraction limit. It was revealed that Fe/Nd_2Fe_<17> mixture equilibrates with the molten Ag-Nd alloy containing 50-52 mol% Nd(57-59 mass% Nd) at 1363K. The experimental results were in good agreement with the thermodynamic calculation based on literature values. By reacting Nd-Fe-B magnet scraps with molten silver at 1273K, more than 90% of the neodymium in the scraps was extracted and an Ag-Nd alloy containing 40-50 mass% Nd was obtained at 1273-1573K. The neodymium in the Ag-Nd alloy was separated from silver as Nd_2O_3 by oxidizing the obtained alloy in air.Furthermore, an environmentally sound process for the extraction of Nd from the scrap was devised and its feasibility was demonstrated. The developed Nd extraction apparatus circulates the Mg as an extraction medium by maintaining a temperature difference within the reaction vessel, thus achieving continuous extraction of metal Nd from the scrap, re-extraction of Mg from a Mg-Nd alloy, and finally, recovery of pure Mg. As a result, pure Nd metal with 97.7% purity was directly recovered from the scrap. It was also shown that the extraction agent, Mg, could be reused. The results confirmed the possibility of the direct extraction of pure Nd metal without the oxidization process.
本研究以熔融银和镁为萃取介质,从钕铁硼B磁体废料中直接萃取分离金属钕,旨在开发一种新的回收工艺。首先,研究了以熔融银为萃取介质,从钕铁硼B磁体废料中直接萃取分离金属钕的工艺。在萃取实验之前,研究了Ag-Fe-Nd体系的相平衡以估计理论萃取极限。结果表明,Fe/Nd_2Fe_3<17>混合物在1363 K时与含Nd 50- 52mol%(57- 59mass%Nd)的Ag-Nd合金熔体相平衡。实验结果与文献热力学计算值吻合较好。在1273- 1573 K温度下,将Nd-Fe-B磁体废料与熔融银反应,提取出废料中90%以上的钕,得到含40-50质量% Nd的Ag-Nd合金。采用空气氧化法将银钕合金中的钕与银分离为Nd_2O_3,并设计了一种从废银中提取钕的环保工艺,论证了该工艺的可行性。所开发的Nd提取装置通过保持反应容器内的温度差使作为提取介质的Mg循环,从而实现从废料中连续提取金属Nd,从Mg-Nd合金中再提取Mg,最后回收纯Mg。结果,从废料中直接回收了纯度为97.7%的纯Nd金属。实验还表明,萃取剂Mg可以重复使用。结果证实了不经氧化直接提取纯金属钕的可能性。
项目成果
期刊论文数量(14)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
O.Takeda: "Phase equilibrium of the system Ag-Fe-Nd, and Nd extraction from magnet scraps using molten silver"T.Alloys and Compounds. (in print). (2004)
O.Takeda:“Ag-Fe-Nd 系统的相平衡,以及使用熔融银从磁铁废料中提取 Nd”T.合金和化合物。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
T.H.Okabe: "Direct Extraction and Recovery of Neodymium Metal from Magnet Scrap"Materials Trans.(JIM). Vol.44,No.4. 798-801 (2003)
T.H.Okabe:“从磁铁废料中直接提取和回收钕金属”Materials Trans.(JIM)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
T.H.Okabe: "Scrap Combination for Recycling Valuable Metals : Direct Extraction and Recovery of Neodymium Metal from Magnet Scraps"Proceedings of Yazawa International Symposium. 1079-1091 (2003)
T.H.Okabe:“回收有价金属的废料组合:从磁铁废料中直接提取和回收钕金属”矢泽国际研讨会论文集。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
O.Takeda: "Phase equilibrium of the system Ag-Fe-Nd, and Nd extraction from magnet scraps using molten silver"J. Alloys and Compounds. (in print). (2004)
O.Takeda:“Ag-Fe-Nd 体系的相平衡,以及使用熔融银从磁铁废料中提取 Nd”J。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
T.H.Okabe: "Direct Extraction and Recovery of Neodymium Metal from Magnet Scrap"Materials Trans. (JIM). 44. 798-801 (2003)
T.H.Okabe:“从磁铁废料中直接提取和回收金属钕”材料翻译。
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UMETSU Yoshiaki其他文献
UMETSU Yoshiaki的其他文献
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{{ truncateString('UMETSU Yoshiaki', 18)}}的其他基金
Development of new technology for elimination of anionic species of minor toxic elements (Se, Sb, As, B) from wastewaters
开发消除废水中微量有毒元素(Se、Sb、As、B)阴离子物种的新技术
- 批准号:
15310045 - 财政年份:2003
- 资助金额:
$ 5.89万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Application of Complex-Forming Reaction to Separation of Rare Earth element by Ionic Exchanger
络合反应在离子交换剂分离稀土元素中的应用
- 批准号:
01550517 - 财政年份:1989
- 资助金额:
$ 5.89万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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