A novel process for recovery of metals value from spent lithium-ion batteries
- 作者：Chen XiangpingZhou TaoFang HuaxiongTang Wenjiang
- 会议时间：2013-10-01
- 关键词：leaching ; recovery ; spent lithium-ion batteries
- 作者单位：Chen Xiangping,Zhou Tao,Tang Wenjiang(College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,China)Fang Huaxiong(Zhejiang Huayou Cobalt co.,LTD)
- 母体文献：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛论文集
- 会议名称：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛
- 会议地点：成都
- 主办单位：中国环境科学学会
- 语种：chi
摘要
A novel process,which combined with citric acid reductive leaching,precipitation and extraction separation,was conducted with experiments which separated and recovered metal values such as Co,Mn,Ni and Li from the cathode active materials of the spent lithium-ion batteries.The leaching efficiency of Ni,Co,Mn and Li can reach 97.5%,98.1%,97.7% and 99.2% respectively under the optimal conditions of 1 M citric acid solution,80 ℃ leaching temperature,90 min leaching time,30 mlg-1 liquid-to-solid ratio and 2 vol.% H2O2.For the recovery process of the leach liquor,firstly Co was selectively reacted and precipitated as CoC2O4·2H2O with (NH4)2C2O4 under the optimum conditions of molar ratio of n(C2O42+):n(CO2+)=1.1∶1.0,equilibrium pH=3 and 60 ℃.Secondly,the Ni in the leaching liquor was selectively precipitated with dimethylglyoxime under the optimal conditions as pH=8 and the molar ratio of dimethylglyoxime to [Ni(NH3)6]2+ of 2.Thirdly,D2EHPA was used as extraction agent to separation Mn from the leach liquor.92% of Mn was extracted under the condition of 25vol.% D2EHPA ,O/A of 2 and pH=8.Finally,the remaining Li in the aqueous solution was readily recovered as Li2CO3 precipitated by the addition of a saturated Na2CO3 solution.The recovery rate of nickel,cobalt,manganese and lithium was 89%,91%,92% and 76%,respectively.