Journal of Industrial and Engineering Chemistry

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Extraction of metals from $Mo-Ni/Al_2O_3$ spent catalyst using $H_2SO_4$ baking-leaching-solvent extraction technique

  • Park, K.H. (Korea Institute of Geosciences & Mineral Resources (KIGAM)) ;
  • Kim, H.I. (Korea Institute of Geosciences & Mineral Resources (KIGAM)) ;
  • Parhi, P.K. (Korea Institute of Geosciences & Mineral Resources (KIGAM)) ;
  • Mishra, D. (SungEel HiTech) ;
  • Nama, C.W. (Korea Institute of Geosciences & Mineral Resources (KIGAM)) ;
  • Park, J.T. (Korea Institute of Geosciences & Mineral Resources (KIGAM)) ;
  • Kim, D.J. (Korea Institute of Geosciences & Mineral Resources (KIGAM))
  • Published : 2012.11.25
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Abstract

Baking-leaching-solvent extraction process was investigated to recover metal values from waste petroleum catalyst. Baking of $Mo-Ni/Al_2O_3$ spent catalyst with $H_2SO_4$ followed by leaching of the baking mass concentrate was presented. Under optimum baking condition (temp. $300^{\circ}C$, $H_2SO_4=1.2$ stoichiometric, baking time 1 h), and low acid leaching condition (temp. $95^{\circ}C$, $H_2SO_4=2%(v/v)$, pulp density 5% and leaching duration 30 min), about 96% Mo, 99% Al and 95% Ni was dissolved. Baking- leaching results were interpreted by two different statistical analysis approaches namely Principal Component (PCA) and Multi Linear Regression Analysis (MLRA). The generated leach liquor was further subjected to the solvent extraction of Mo(VI) by LIX 84-I followed by aluminum using Na-Cyanex 272. A quantitative extraction of Mo(VI) and Al was achieved in 2-stage at A:O ratio of 1:1 with 40% LIX-84-I and 2-stages at 1:1 phase ratio with 60% neutralized Cyanex 272, respectively. While stripping the metals from loaded organic such as Mo(VI) using 20% $NH_4OH$ and Al with 3 M $H_2SO_4$, the metal concentration in the strip solution were enriched up to 1.5 times and 3 times in two and three number of stages, respectively. Based on the results of present study, a conceptual process flow diagram was proposed.

Keywords

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