Research on Leaching Lithium and Manganese from Waste Lithium Manganate Battery Cathode Materials with Deep Eutectic Solvent
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摘要:
低共熔溶剂做为绿色溶剂在废旧锂电池有价组分回收领域研究受到人们日益关注，以废旧锰酸锂电池正极粉为对象，研究了盐酸胍和乳酸低共熔溶剂对锂和锰的浸出性能，考察了浸出温度、浸出液固比和浸出时间等条件对锂和锰的浸出率影响，研究结果表明：采用盐酸胍和乳酸摩尔比1∶2制备的低共熔溶剂，适宜的溶解条件为浸出液固体积质量比为10 mL/g，溶解温度为70 ℃，浸出时间为2 h，在此条件下锰酸锂正极粉中锂和锰的浸出率分别达到99.27%和99.20%。
Abstract:As a green solvent, the deep eutectic solvent has attracted increasing attention in the field of recycling valuable components of waste lithium batteries. In this paper, the waste lithium manganate battery cathode powder was taken as the object for lithium and manganese leaching using deep eutectic solvent of guanidine hydrochloride and lactic acid. The effects of leaching temperature, leaching liquid solid ratio and leaching time on the leaching rate of lithium and manganese were investigated. The results showed that the appropriate dissolution conditions were as follows: using deep eutectic solvent with the mole ratio of guanidine hydrochloride to lactic acid 1∶2, the volume mass ratio of leaching solution to solid was 10 mL/g, the dissolution temperature was 70 ℃, and the leaching time was 1 h. Under the appropriate dissolution conditions, the leaching rate of lithium and manganese in lithium manganate cathode powder reached to 99.27% and 99.20% respectively.
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Key words:
- lithium manganate battery /
- deep eutectic solvent /
- leaching /
- lithium /
- manganate
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表 1 锰酸锂正极粉全元素分析结果
Table 1. All element analysis results of lithium manganate cathode powder
/% 化学组分 CO2 Na2O MgO Al2O3 SiO2 P2O5 SO3 MnO2 Nb2O5 含量 3.12 0.209 0.140 0.333 0.295 0.040 0.881 93.80 1.10 
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表 2 锰酸锂正极粉主要化学组分
Table 2. Chemical components of lithium manganate cathode powder
/% 化学组分 Li Mn Al 含量 3.94 51.55 0.091
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表 3 最佳条件验证试验结果
Table 3. Validation test results under optimal conditions
/% 试验次数 浸出率/% Li Mn 1 99.23 99.14 2 99.31 99.26 3 99.28 99.21 平均值 99.27 99.20
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