Effect of Crushing Particle Size for Leaching of Lithium and Cobalt with Citric Acid from Spend Lithium Ion Battery
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摘要:
这是一篇冶金工程领域的论文。研究了柠檬酸环境下破碎粒度和浸出条件对失效锂离子电池锂钴的浸出，为不同类型混合失效锂离子电池回收提供一定参考。结果表明：混合了不同类型的失效锂离子电池中金属含量占比较大的有Mn，Al，Ni，Co，Li，为简化回收工艺及Co、Li的回收价值较大，可只回收Co、Li。破碎粒度在-5 mm范围内对锂钴浸出率的影响较小，而较大破碎粒度浸出率不高可能是因为锂钴包裹在了颗粒中间而不能与浸出液接触而降低了浸出效果。针对混合了不同类型的失效锂离子电池而言，在-5 mm粒级下，柠檬酸浓度1.0 mol/L，浸出温度65 ℃，固液比1 g/100 mL，H2O2 浓度3%，浸出时间55 min，搅拌速度30 r/min条件下进行浸出实验，获得锂浸出率97.86%，钴浸出率98.01%的较好浸出效果。
Abstract:This is an essay in the field of metallurgical engineering. The effects of crushing particle size and leaching conditions on the leaching of lithium cobalt from spend lithium-ion batteries in the citric acid environment were studied, which provided some reference for the recovery of different types of mixed spend lithium-ion batteries. The results showed that Mn, Al, Ni, Co and Li accounted for a large proportion of the contents in mixed different types of spend lithium-ion batteries. Due to the larger recovery value of Co and Li and simplify the recovery process, only Co and Li be recovered. The crushing particle size has little influence on the leaching rate of lithium cobalt in the range of -5 mm, while the leaching rate of lithium cobalt in the larger crushing particle size is not high, which may be lithium and cobalt wrapped in the middle of particles and cannot contact with the leaching solution, thus reducing the leaching effect. For mixed different types of spend lithium-ion batteries, under the conditions of -5 mm particle size, citric acid concentration 1.0 mol/L, leaching temperature 65 ℃, solid-liquid ratio 1 g/100 mL, H2O2 concentration 3%, leaching time 55 min, stirring speed 30 r/min, the lithium leaching rate of 97.86% and cobalt leaching rate of 98.01% are obtained.
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Key words:
- Metallurgical engineering /
- Spend lithium ion battery /
- Crushing size /
- Citric acid /
- Recycling /
- Leaching
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表 1 混合样品元素含量/%
Table 1. Element content of mixed samples
Al Co Cr Cu Fe Li Mn Ni 11.92 6.55 0.02 0.06 0.23 3.70 18.71 7.90 
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表 2 各粒级样品中锂钴含量
Table 2. Content of lithium and cobalt in each particle size sample
粒级/mm Co/% Li/% -0.25 6.65 3.87 -0.5+0.25 5.94 3.42 -1+0.5 5.78 3.42 -2+1 6.95 3.39 -4+2 6.25 3.23 混合粒级 6.55 3.70
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