锂离子电池正极废料中有价元素的选择性回收及其动力学模型

Selective Recovery and Kinetics of Valuable Elements from Waste Lithium-ion Battery Cathodes

以LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2正极片生产废料为原料,用实验室自行研发的有机酸浸取剂IPE-A分离正极片中的铝箔,并对其中的有价元素进行选择性回收.结果表明,浸取剂IPE-A浓度3.5 mol/L、还原剂H_2O_2 4%(Φ)、固液比40 g/L、60℃水浴加热、反应40 min时,Li的浸出率为98.17%,Ni,Co,Mn的浸出率分别达93.45%,94.54%,96.41%,正极废料中铝箔集流体中的Al浸出率仅为2.07%,达到了很好的分离回收效果.采用Avrami方程描述浸取剂IPE-A浸出反应的动力学,浸出Ni,Co,Mn,Li的活化能分别为36.30,36.71,36.47,33.21 kJ/mol,化学反应为浸出过程的控速步骤.

The IPE-A, self-developed organic acid leaching agent, was used to separate A1 foil and selective recovery of the valuable metals from the LiNil/3Col/3Mnl/302 cathode scrap of production waste. The results showed that the best recovery conditions were as follows： organic acid IPE-A concentration of 3.5 mol/L, the 1-1202 concentration of 4%（φ）, solid to liquid ratio of 40 g/L, reaction temperature of 60℃ and reaction time of 40 min. The leaching rates of Ni, Co, Mn and Li reached 93.45%, 94.54%, 96.41% and 98.17% respectively, while the leaching rate of A1 was only 2.07%, which can be neglected, and the positive cathode material and aluminum foil can be separated well. Avrami equation could be used to correlate the experimental data of the leaching reaction, and the activation energies of Ni, Co, Mn, Li were 36.30, 36.71, 36.47, 33.21 kJ/mol. The reaction velocity was controlled by chemical reaction steo.