Neodymium (Nd) magnets are in high demand for use in the manufacture of electric vehicle motors and medical equipment such as magnetic resonance imaging. In this study, we describe a new process for recycling Nd permanent magnets (PMs). PM scrap powder was leached into a waste pickling solution, evaporated under reduced pressure, concentrated, and converted into an oxide via heat treatment. Nd was selectively leached from the prepared oxide using hydrochloric acid. Iron was removed from the leached solution, and the Nd composite was then recovered using a urea-mediated Nd-recovery method. The oxidation temperature was determined using a thermogravimetric analysis. High-purity Nd-oxide powders were obtained by calcination at 900 °C. This economical process enables the recovery of PM powder by relying on the pickling process and acid-regeneration plants, which are both essential in steel manufacturing.

中文翻译：

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使用废酸洗溶液从永磁体废料中选择性回收氧化钕

钕 (Nd) 磁铁在电动汽车电机和磁共振成像等医疗设备的制造中需求量很大。在这项研究中，我们描述了一种回收 Nd 永磁体 (PM) 的新工艺。将PM废料粉末浸入废酸洗液中，减压蒸发，浓缩，并通过热处理转化为氧化物。使用盐酸选择性地从制备的氧化物中浸出 Nd。从浸出溶液中去除铁，然后使用尿素介导的 Nd 回收方法回收 Nd 复合材料。使用热重分析确定氧化温度。在900℃下煅烧得到高纯氧化钕粉末。这种经济的工艺可以通过酸洗工艺和酸再生设备来回收颗粒物粉末，这两者在钢铁制造中都是必不可少的。