Recovery of samarium and cobalt/iron oxide from SmCo magnets through acid baking and water leaching

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2024-10-10 DOI:10.1007/s10163-024-02096-1

Elif Emil-Kaya, Xi Lu, Bernd Friedrich

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引用次数: 0

Abstract

Rare earth elements (REEs) and cobalt (Co) are listed as critical raw materials because of their importance in global industrial production growth, high supply risk, and economic significance. The recovery of Co and REEs from secondary resources is therefore proposed as a key countermeasure to address this concern. In this study, a straightforward process that integrates acid baking and water leaching is proposed for the recovery of samarium (Sm) and Co from scrap SmCo magnets. Firstly, the chemical composition of SmCo magnets is revealed by ICP-OES and XRF. The Taguchi experimental design technique is employed to optimize nitric acid baking and water leaching. Based on the thermal decomposition behavior of Co, Fe, and Sm, the acid baking temperature is studied for the conversion of metal nitrates, excluding REEs nitrates, into metal oxides. The optimal conditions for acid baking and water leaching are identified, and a reactor for the pilot-scale acid baking process is proposed. The optimum parameters are tested with the proposed reactor.

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通过酸焙烧和水浸法从钐钴磁铁中回收钐和钴/氧化铁

稀土元素（REEs）和钴（Co）因其在全球工业生产增长中的重要性、高供应风险和经济意义而被列为关键原材料。因此，从二次资源中回收钴和稀土元素被认为是解决这一问题的关键对策。在本研究中，提出了一种将酸焙烧和水浸出相结合的直接工艺，用于从废旧钐钴磁铁中回收钐（Sm）和钴。首先，利用 ICP-OES 和 XRF 揭示了钐钴磁体的化学成分。采用田口试验设计技术对硝酸焙烧和水浸出进行优化。根据 Co、Fe 和 Sm 的热分解行为，研究了将金属硝酸盐（不包括 REEs 硝酸盐）转化为金属氧化物的酸焙烧温度。确定了酸焙烧和水浸出的最佳条件，并提出了中试规模酸焙烧工艺的反应器。利用提议的反应器对最佳参数进行了测试。

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来源期刊

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).