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Leaching zinc from spent catalyst: process optimization using response surface methodology.

Zhengyong Zhang1, Jinhui Peng, C Srinivasakannan

  • 1Key Laboratory of Unconventional Metallurgy (Kunming University of Science and Technology), Ministry of Education, Kunming 650093, China.

Journal of Hazardous Materials
|January 12, 2010
PubMed
Summary
This summary is machine-generated.

This study efficiently recovers zinc from spent catalysts using microwave-assisted ammonia leaching. Optimized conditions achieved a 97% zinc recovery, demonstrating a viable recycling method for industrial waste.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Environmental Science

Background:

  • Spent catalysts from vinyl acetate synthesis are a significant source of zinc.
  • Efficient recovery of zinc from these catalysts is crucial for resource sustainability and waste reduction.

Purpose of the Study:

  • To develop and optimize a microwave-assisted leaching process for zinc recovery from spent catalysts.
  • To investigate the impact of key parameters on zinc leaching efficiency.

Main Methods:

  • Microwave treatment followed by leaching with an ammonia, ammonium carbonate, and water solution.
  • Optimization of process parameters (leaching time, liquid/solid ratio, ammonia concentration) using Response Surface Methodology (RSM) with Central Composite Design (CCD).
  • Characterization of samples using X-ray diffraction (XRD), nitrogen adsorption, and scanning electron microscopy (SEM).

Main Results:

  • Optimum leaching conditions identified as 2.50 h leaching time, a liquid/solid ratio of 6, and 5.37 mol/L ammonia concentration.
  • Maximum zinc recovery of 97% achieved under optimized conditions.
  • RSM model showed good agreement with experimental data (R² = 0.95).

Conclusions:

  • Microwave-assisted ammonia leaching is an effective method for high-efficiency zinc recovery from spent catalysts.
  • The optimized process offers a sustainable solution for managing industrial waste and recovering valuable metals.
  • Further characterization confirmed the effectiveness of the leaching process.