Leaching zinc from spent catalyst: Process optimization using response surface methodology

Zhengyong Zhang, Jinhui Peng*, C. Srinivasakannan, Zebiao Zhang, Libo Zhang, Y. Fernández, J. A. Menéndez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


The spent catalyst from vinyl acetate synthesis contains large quantity of zinc. The present study attempts to leach zinc using a mixture of ammonia, ammonium carbonate and water solution, after microwave treatment. The effect of important parameters such as leaching time, liquid/solid ratio and the ammonia concentration was investigated and the process conditions were optimized using surface response methodology (RSM) based on central composite design (CCD). The optimum condition for leaching of zinc from spent catalyst was identified to be a leaching time of 2.50 h, a liquid/solid ratio of 6 and ammonia concentration 5.37 mol/L. A maximum of 97% of zinc was recovered under the optimum experimental conditions. The proposed model equation using RSM has shown good agreement with the experimental data, with a correlation coefficient (R2) of 0.95. The samples were characterized before and after leaching using X-ray diffraction (XRD), nitrogen adsorption and scanning electron microscope (SEM).

Original languageEnglish
Pages (from-to)1113-1117
Number of pages5
JournalJournal of Hazardous Materials
Issue number1-3
Publication statusPrint publication - 15 Apr 2010
Externally publishedYes


  • Ammonia leaching
  • Optimization
  • Response surface methodology
  • Spent catalyst
  • Zinc

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