The residue known as jarosite-alunite (JAR) is produced when the leach solution of spent lithium-ion battery is neutralized. This residue typically consists of Fe, Al, NaSO, Ni, Co, and Mn. It is classified as both a hazardous solid waste and a secondary resource. A unique hydrometallurgical technique was implemented to recover NaSO and use Al extracted from JAR in high value applications. This extraction process involves phase transformation and NaOH leaching, with the pH adjusted in the range from 10.9 to 14. Initially, the JAR compound underwent dissociation to isolate SO as NaSO by means of NaOH at a moderate pH, while the other metals were preserved as a hydroxide residue. Afterwards, aluminum in the hydroxide residue was selectively leached with NaOH leaving Ni, Co, and Mn in the remaining residue. The results indicated that over 93% of NaSO and 86% of Al in JAR were effectively recovered as NaSO and high value-added γ-AlOOH, respectively. Additionally, the enriched Ni, Co, and Mn in the alkaline leach residue were selectively recovered by HSO leaching. The suggested procedure led to a significant decrease in waste by more than 67%, offering a fresh approach to effectively reduce waste and recover metals from JAR.

中文翻译：

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废旧锂离子电池回收产生的黄钾铁矾-明矾石渣（JAR）的减量化与高值化利用


当废锂离子电池的浸出液被中和时，会产生称为黄钾铁矾-明矾石（JAR）的残留物。该残留物通常由 Fe、Al、NaSO、Ni、Co 和 Mn 组成。它被归类为危险固体废物和二次资源。采用独特的湿法冶金技术来回收 NaSO 并将从 JAR 中提取的铝用于高价值应用。该提取过程涉及相变和 NaOH 浸出，pH 值调整在 10.9 至 14 范围内。最初，JAR 化合物在中等 pH 值下通过 NaOH 解离，以 NaSO 的形式分离出 SO，而其他金属则保留为氢氧化物残留物。然后，用 NaOH 选择性浸出氢氧化物残渣中的铝，在剩余残渣中留下 Ni、Co 和 Mn。结果表明，JAR中93%以上的NaSO和86%的Al分别被有效回收为NaSO和高附加值的γ-AlOOH。此外，通过HSO浸出选择性地回收了碱性浸出残渣中富集的Ni、Co和Mn。建议的程序使废物显着减少了 67% 以上，为有效减少废物并从 JAR 中回收金属提供了一种新方法。