优化金属和稀土元素从使用的Ni-MH电池中漏,通过响应表面方法

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Aba Marie Anne-Antoine Otron¹, Tetere Jessica Farida Millogo¹, Lan-Huong Tran¹

¹Institut National de la Recherche Scientifique (Centre Eau Terre Environnement), Université du Québec, Québec, Canada.

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|July 31, 2023

概括

回收废弃金属化物 (Ni-MH) 电池至关重要. 优化的酸液有效地回收有价值的稀土元素 (REEs) 和金属,减少对环境的影响.

科学领域:

材料科学与工程材料科学与工程
环境科学与技术环境科学与技术
化学工程是化学工程的重要组成部分.

背景情况:

可充电电池市场大幅扩大,导致金属化物 (Ni-MH) 电池的废物流量不断增加.
这些电池含有贵重金属和有毒元素,给环境带来挑战,并代表经济资源的损失.
从使用过的Ni-MH电池中回收金属的高效方法对于可持续的资源管理和循环经济原则至关重要.

研究的目的:

优化从废弃的Ni-MH电池中回收稀土元素 (REEs) 和其他金属的溶解条件.
为了研究硫酸浸出用于金属提取的有效性.
为了验证开发的工艺在电池回收的潜在工业应用.

主要方法:

使用Box-Behnken设计方法来优化关键的漏参数:硫酸度,固体/液体比,漏时间和温度.
分析了Ni-MH电池粉末的组成,确定了主要元素,如 (Ni),兰 (La), (Co), (Zn), (Nd), (Sm) 和 (Ce).
使用硫酸进行了漏实验,并在反流漏模式下评估了该过程.

主要成果:

最佳溶解条件是2M H2SO4,10% (w:v) 固体与液体的比率,60°C,90分钟的反应时间.
实现了高溶解率:81%的Ni,99%的 (Co) 和70%的稀土元素 (REEs),与模型预测密切匹配.
反流水显示了多个阶段的高金属和REE回收,并显著降低了用水量.

结论:

优化的硫酸漏工艺对于从废弃的Ni-MH电池中回收贵金属和可再生能源非常有效.
已建立的条件为工业规模的Ni-MH电池废弃物回收提供了可行的途径.
这种方法有助于节约资源,并减轻与电池处置相关的环境危害.

关键词:

电池电池电池电池科巴尔特是什么? 科巴尔特是什么?泄漏 (leaching) 泄漏 (leaching) 是指一个过程.尼克尔尼克尔是什么意思稀土是一种稀土.

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