电场对废旧锂离子电池中有价金属浸出的影响

Effect of electric field on leaching valuable metals from spent lithium-ion batteries

提出一种电场强化浸出工艺,用于提高废旧锂离子电池提取Li、Ni、Co以及Mn过程中的浸出效率。通过产品表征和浸出动力学等手段,对浸出工艺参数进行优化并对浸出机制进行研究。在优化浸出条件下,超过98%Li、97%Ni和Co以及93%Mn被浸出进入到溶液中。浸出动力学研究表明,Li、Ni、Co和Mn的浸出过程由基于核缩减模型的化学反应控制,并确定浸出活化能分别为42.4、46.1、46.2和47.3k J/mol。浸出过程中,施加电场为溶液中Fe^(2+)和Cl^(-)的循环利用提供了便利通道,减少了还原剂的添加量,同时保证了高的金属浸出率。

An electric field enhanced leaching process was proposed to improve the leaching efficiency in the process of extracting Li,Ni,Co and Mn from waste lithium ion batteries.The leaching process was optimized and the leaching mechanism was studied by means of leaching experiments,product characterization and leaching kinetics.Under the optimized leaching conditions,more than 98%Li,97%Ni and Co and 93%Mn were leached into the solution.The study of leaching kinetics shows that the leaching process of Li,Ni,Co and Mn is controlled by chemical reaction based on nuclear reduction model,and the activation energy of leaching is determined to be 42.4,46.1,46.2 and 47.3 k J/mol,respectively.During the leaching process,the application of electric field provides a convenient channel for the recycling of Fe^(2+)and Cl^(-)in the solution,reduces the amount of reducing agent added,and ensures high metal leaching rate.