Selective Ni Recovery from Spent Ni-Mo-Based Catalysts

니켈-몰리브데늄 성분계 폐촉매로부터 니켈의 선택적 회수

  • Lee, Tae Kyo (National Research Laboratory, School of Display & Chemical Engineering, Yeungnam University) ;
  • Han, Gi Bo (National Research Laboratory, School of Display & Chemical Engineering, Yeungnam University) ;
  • Yoon, Suk Hoon (National Research Laboratory, School of Display & Chemical Engineering, Yeungnam University) ;
  • Lee, Tae Jin (National Research Laboratory, School of Display & Chemical Engineering, Yeungnam University) ;
  • Park, No-Kuk (Institute of Clean Technology, Yeungnam University) ;
  • Chang, Won Chul (KOCAT Inc.)
  • 이태교 (영남대학교 디스플레이화학공학부) ;
  • 한기보 (영남대학교 디스플레이화학공학부) ;
  • 윤석훈 (영남대학교 디스플레이화학공학부) ;
  • 이태진 (영남대학교 디스플레이화학공학부) ;
  • 박노국 (영남대학교 청정기술연구소) ;
  • 장원철 ((주) 코캣)
  • Received : 2008.09.26
  • Accepted : 2008.10.30
  • Published : 2008.12.10

Abstract

The objective of this study is to optimize the leaching conditions of sequential leaching and extracting processes for selective Ni recovery from spent Ni-Mo-based catalyst. The selective Ni recovery process consists of two processes of leaching and extracting process. In this 2-step process, Ni component is dissolved from solid spent Ni-Mo-based catalyst into leaching agent in leaching process and sequentially extracted to Ni complex with an extracting agent in the extracting process. The solutions of nitric acid ($HNO_3$), ammonium carbonate ($(NH_4)_2CO_3$) and sodium carbonate ($Na_2CO_3$) were used as a leaching agent in leaching process and oxalic acid was used as an extracting agent in extracting process. $HNO_3$ solution is the most efficient leaching agent among the various leaching agent. Also, the optimized leaching conditions for the efficient and selective Ni recovery were the leaching temperature of $90^{\circ}C,\;HNO_3$ concentration of 6.25 vol% and elapsed time of 3 h. As a result, Nickel oxalate having the highest yield of 88.7% and purity of 100% was obtained after sequentially leaching and extracting processes under the optimized leaching conditions.

Keywords

spent Ni-Mo-based catalysts;optimization of leaching condition;selective nickel recovery;wet recovery process

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