화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.88, 339-347, August, 2020
DOI10.1016/j.jiec.2020.05.002  Export Citation
Precipitation of La and dissolution enhancement of Ni by a one pot oxidative leaching process from mixed batteries
Sung-Ho Joo1, Dong Ju Shin1, Dongseok Lee1, 2, Min-seuk Kim1, and Shun Myung Shin1, 2, †
  • 1Resource Recovery Research Center, Korea Institute of Geoscience and Mineral Resources, 124 gwahak-ro, Yuseong-cu, Daejeon, Korea
  • 2Department of Resources Recycling, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, Korea
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A single oxidative leaching process was developed for simultaneous enhancement of dissolution of nickel and precipitation of lanthanum by using Na2S2O8 in sulfuric acid solution from a heat-treated mixture of batteries containing 50 wt.% alkaline batteries, 25 wt.% Ni-MH batteries, and 25 wt.% Ni-Cd batteries. The effect of leaching parameters was investigated, including the concentrations of sulfuric acid, Na2S2O8, and H2O2, the temperature, and the leaching time. The results show that almost all metals such as zinc, manganese, and cadmium are dissolved by 2 M sulfuric acid, but the leaching efficiency of nickel is 86.8%. However, in a leaching process using Na2S2O8, the leaching efficiency of Ni is enhanced while lanthanum is selectively precipitated in the form of NaLa(SO4)2·H2O at the same time, and this result is supported by XRD, ICP, and SEM analysis. Under the optimum conditions of 2 M H2SO4,10 vol.% H2O2,10 vol.% 1 M Na2S2O8, and 95℃,97.8% of the nickel is leachedwhile98.8% of thelanthanumisselectively precipitated.Thisstudyshows that the separation and purification stages can be simplified to recover La and valuable metals.
Keywords:Mixture of batteries;Na2S2O8nickel;Lanthanum;Na2La(SO4)2·H2O
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