化工进展 ›› 2025, Vol. 44 ›› Issue (S1): 528-540.DOI: 10.16085/j.issn.1000-6613.2025-0766

• 资源与环境化工 • 上一篇    

废旧高镍正极材料酸性焙烧过程中的化学变化及金属回收

陈怀敬1,2(), 李彦强1(), 王大辉1(), 彭小平1, 宋晓龙1   

  1. 1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃 兰州 730050
    2.兰州理工大学理学院,甘肃 兰州 730050
  • 收稿日期:2025-05-28 修回日期:2025-08-09 出版日期:2025-10-25 发布日期:2025-11-24
  • 通讯作者: 王大辉
  • 作者简介:陈怀敬(1974—),女,副教授,研究方向为资源循环利用。E-mail:120126498@qq.com
    李彦强(1997—),男,硕士研究生,研究方向为资源循环利用。E-mail:3204893178@qq.com
  • 基金资助:
    国家自然科学基金(51864032);沈阳材料科学国家(联合)实验室-有色金属加工与再利用国家重点实验室联合基金(18LHZD002);甘肃省科技重大专项(22ZD6GA008)

Chemical changes and metal recovery during sulfation roasting of spent high-nickel cathode materials

CHEN Huaijing1,2(), LI Yanqiang1(), WANG Dahui1(), PENG Xiaoping1, SONG Xiaolong1   

  1. 1.State Key Laboratory of Advance Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.College of Science, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
  • Received:2025-05-28 Revised:2025-08-09 Online:2025-10-25 Published:2025-11-24
  • Contact: WANG Dahui

摘要:

高镍正极材料LiNi0.6Co0.2Mn0.2O2具有更高的电化学容量并已开始应用于电动汽车动力电池,其报废后的回收利用受到广泛关注。本文采用热重-差示扫描量热法(TG-DSC)、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜-能量色散X射线谱(SEM-EDS)、热力学分析和电感耦合等离子体发射光谱(ICP-OES)等方法,系统研究了废旧高镍正极材料LiNi0.6Co0.2Mn0.2O2在酸性焙烧环境中的化学变化及金属回收。结果表明,高温作用下NaHSO4·H2O发生热分解产生气体SO3、H2O改变了焙烧过程气相组成。气相中SO3、H2O的存在有利于LiNi0.6Co0.2Mn0.2O2发生化学转变,并促使Li、Ni、Co及Mn元素中发生相应反应形成氢氧化物、氧化物及硫酸盐,金属硫酸盐是热力学最稳定的产物。NaHSO4·H2O的使用量对焙烧产物的组成有明显影响。随着NaHSO4·H2O使用量增加,焙烧产物中LiNi0.6Co0.2Mn0.2O2的量减少直至消失。当LiNi0.6Co0.2Mn0.2O2和NaHSO4·H2O混合质量比为1∶1.97时,焙烧产物物相组成为LiNaSO4、Ni6MnO8、MnCo2O4、NiO、Na2Ni(SO4)2、Na2Mn(SO4)2和Na2Co(SO4)2。焙烧过程中LiNi0.6Co0.2Mn0.2O2处于高价态的Ni、Co、Mn向低价态转变,焙烧产物的微观形貌呈现尺寸不一的块状并出现烧结现象。在LiNi0.6Co0.2Mn0.2O2与NaHSO4·H2O混合质量比为1∶1.97、600℃焙烧0.5h、60℃水浸出0.5h以及液固比25∶1(mL/g)的条件下,Li、Ni、Co、Mn的浸出率分别达到97.13%、16.72%、6.3%和19.38%,废旧高镍正极材料LiNi0.6Co0.2Mn0.2O2中的Li绝大部分已转移至水浸出液中。因此,将废旧高镍正极材料LiNi0.6Co0.2Mn0.2O2酸性焙烧并对焙烧产物进行水浸处理来实现有价金属的回收是可行的。

关键词: 废旧高镍正极材料, 酸性焙烧, 化学变化, 金属回收, 水浸处理

Abstract:

High-nickel cathode material LiNi0.6Co0.2Mn0.2O2 has a higher electrochemical capacity and has begun to be applied in electric vehicle power batteries. The recycling and utilization of its scrap has received extensive attention. This paper adopted methods such as TG-DSC, XRD, XPS, SEM-EDS, thermodynamic analysis and ICP-OES to systematically study the chemical changes and metal recovery of the spent high-nickel cathode material LiNi0.6Co0.2Mn0.2O2 during sulfation roasting. The results showed that under high temperature, NaHSO4·H2O underwent thermal decomposition to produce gas SO3 and H2O, which changed the gas phase composition of the roasting process. The presence of SO3 and H2O in the gas phase was conducive to the chemical transformation of LiNi0.6Co0.2Mn0.2O2 and promoted the corresponding reactions of Li, Ni, Co, and Mn elements to form hydroxides, oxides and sulfates with metal sulfates being the thermodynamically most stable products. The amount of NaHSO4·H2O used had a significant effect on the composition of the roasting products. As the amount of NaHSO4·H2O used increased, the amount of LiNi0.6Co0.2Mn0.2O2 in the roasting products decreased until it disappeared. When the mixing ratio reached 1∶1.97, the phase composition was LiNaSO4, Ni6MnO8, MnCo2O4, NiO, Na2Ni(SO4)2, Na2Mn(SO4)2 and Na2Co(SO4)2. Under the conditions of a mixing ratio of 1∶1.97, roasting at 600℃ for 0.5h, water leaching at 60℃ for 0.5h and a liquid-to-solid ratio of 25∶1(mL/g), the leaching rates of Li, Ni, Co and Mn reached 97.13%, 16.72%, 6.3% and 19.38%, respectively, and most of the Li in LiNi0.6Co0.2Mn0.2O2 in the waste high-nickel cathode material was transferred to the water leaching solution. Roasting spent LiNi0.6Co0.2Mn0.2O2 and water leaching the roasting products to achieve the recovery of valuable metals was feasible.

Key words: spent high-nickel cathode materials, sulfation roasting, chemical changes, metal recovery, soaking in water treatment

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