Recovery of valuable metals from SmCo magnets through sulfation, selective oxidation, and water leaching

Samarium-cobalt (SmCo) magnets, comprised of rare earth elements (REE), and cobalt (Co) are widely employed in diverse sectors such as aerospace, medical, defense, automotive, and more due to their unique properties such as outstanding high-temperature resistance, superior corrosion resistance, a hi...

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Published inSeparation science and technology Vol. 59; no. 10-14; pp. 1241 - 1254
Main Authors Papakci, Merve, Emil-Kaya, Elif, Stopic, Srecko, Gurmen, Sebahattin, Friedrich, Bernd
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 21.09.2024
Taylor & Francis Ltd
Subjects
Cobalt
Copper
Corrosion
Corrosion effects
Corrosion products
Corrosion resistance
critical metals
Curie temperature
Energy costs
Heavy metals
High temperature
Hydrometallurgy
Iron
Leaching
Magnetic properties
Magnets
Materials recovery
Operating costs
Optimization
Oxidation
Oxidation resistance
Parameters
Production costs
Rare earth elements
Recycling
Samarium
separation
Sulfation
Temperature
Water
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Summary:Samarium-cobalt (SmCo) magnets, comprised of rare earth elements (REE), and cobalt (Co) are widely employed in diverse sectors such as aerospace, medical, defense, automotive, and more due to their unique properties such as outstanding high-temperature resistance, superior corrosion resistance, a higher Curie temperature, and high energy density. REE and Co are on the critical metals list for many years, along with increased production costs and challenges. With the increasing amount of waste SmCo, the recycling of these magnets has gained importance. This study investigates the recycling of SmCo magnet scraps through sulfation, selective oxidation, and water leaching. The effect of experimental parameters, such as powder/acid concentration, selective oxidation temperature, selective oxidation time, solid/liquid ratio and leaching time for water leaching are studied in detail. The optimal parameters are determined: 800°C selective oxidation temperature, 1-h selective oxidation time, 1/3 g/ml magnet: acid ratio, 2-h water leaching time and 1/20 water leaching s/l ratio. Under the optimum conditions the extraction efficiency of Sm reached approximately 65%, The solubility of Fe, Co, and Cu metals in the solution is negligible.
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content type line 14
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2024.2368229