学术论文

      硫酸-甘蔗渣体系浸出提取废旧锂离子电池中的钴

      Leaching cobalt from waste lithium-ion batteries using sulfuric acid-bagasse system

      摘要:
      为回收废旧锂离子电池中的有价值金属,采用硫酸-甘蔗渣体系进行酸浸,将钴从废旧锂离子电池电极材料中浸出,并探讨了甘蔗渣对钴浸出效果的影响及反应机理.研究表明:甘蔗渣作为还原剂参与浸出反应,甘蔗渣中的醛基以及反应后的中间产物RCOO.H2,都可与Co3+反应,将其还原成Co2+,替代了价格昂贵且利用率低的H2O2,提高了钴的浸出率.钴的浸出反应符合有收缩的未反应核模型,反应前期,表观活化能为22.98 kJ/mol;反应后期,表观活化能为38.31 kJ/mol.在浸出温度90 ℃,浸出时间1 h,硫酸浓度2 mol/L,液固比150∶1 ,甘蔗渣粒径0.3 mm,甘蔗渣添加量0.5 g的最优条件下,钴的浸出率达95.38%.
      Abstract:
      In order to recover valuable metals in waste lithium ion batteries, a sulfuric acid-bagasse system was used for leaching cobalt from waste electrode materials of lithium-ion batteries in this study.The leaching efficiency and reaction mechanism of the sulfuric acid-bagasse system were investigated.The experimental results demonstrated that sugarcane residues were involved in leaching reaction as a reducing agent.The aldehyde groups in the bagasse and the reaction intermediates such as RCOO.H2 could replace H2O2, which was of high cost and low utilization rate, to reduce Co3+ to Co2+, and increase the leaching efficiency.The cobalt leaching reaction was consistent with the reaction less core-shrinking model, the apparent activation energy was 22.98 kJ·mol-1 in the early stage of reaction, and 38.31 kJ·mol-1 in the later.The optimal leaching temperature, leaching time, sulfuric acid concentration, the ratio of solid to liquid, bagasse size, and the dosage of bagasse were 90 ℃, 1 h, 2 mol·L-1, 150∶1 mL·g-1, 0.3 mm, and 0.5 g respectively.The cobalt leaching efficiency was up to 95.38% under the optimum condition.
      Author: MENG Guan-jun HUANG Kui ZHU Kun HAN Fu-man YAN You-zi DONG Hai-li
      作者单位: 广西大学环境学院,广西南宁,530004
      年,卷(期): 2017, 42(2)
      分类号: X705
      在线出版日期: 2017年5月16日
      基金项目: 广西自然科学基金资助项目,广西高校科学技术研究项目,广西大学科研基金资助项目