Abstract
This study aimed to select the most suitable acid solution for leaching samarium cobalt (SmCo) magnets by comparing the leaching efficiency, cost, and carbon emissions of inorganic acids (hydrochloric acid and nitric acid) and organic acids (citric acid). The total leaching efficiency, material flow cost accounting (MFCA), and ISO14064-1 methods were utilized. The findings suggest that nitric acid exhibits the highest overall leaching efficiency with the lowest cost and carbon emissions, making it the most appropriate acid solution for leaching SmCo magnets. Additionally, organic acid (citric acid) leaching resulted in lower environmental friendliness.
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