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<p>Since the kinetics of bioleaching of heavy metals from solid wastes are restricted by the limited maximum acid-producing ability of a single bacterium, the compatibility of acidophilic autotrophic bacteria in the leaching of heavy metals would be desirable. Herein, three microorganisms including <i>Acidithiobacillus ferrooxidans</i>, <i>Leptospirillum ferriphilum</i>, <i>Thiobacillus thiooxidans</i>, and their mixed microbial consortium (MC) were applied to leach Cu from four waste resins and two pyrometallurgical slags. The bioleaching efficiencies as functions of bacteria species, kinetics and solid/liquid ratio were evaluated. Specifically, the utilization of MC promoted the bioleaching efficiencies with ratios of 97.2–99.2% from four waste resins, 99.5% from converter slag and 91.6% from flotation tailing. The kinetics were accelerated from 1.0&#xa0;day to 0.5&#xa0;day for waste resins and from 8.0 days to 6.0 days for pyrometallurgical slags. MC presented higher recovery efficiency (98.9% for Resin 2 and 97.7% for converter slag) and faster kinetic stability (0.5&#xa0;day for Resin 2 and 6 days for converter slag) than single bacterium. MC improved the leached fraction and reduced the residual fraction of Cu in solid wastes. Face centered cubic Cu element existed in waste resins was bioleached effectively from waste resins using XRD analysis. This study paved a valuable way for the efficient treatment of solid wastes.</p>

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Bioleaching of Waste Resins and Pyrometallurgical Slags for Extraction of Copper Using Three Microorganisms and their Compounds

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Haifei Lu,
  • Xiaofei Yan,
  • Shanshan Su,
  • Yaqi Jia,
  • Jingjing Wu,
  • Houhu Zhang

摘要

Since the kinetics of bioleaching of heavy metals from solid wastes are restricted by the limited maximum acid-producing ability of a single bacterium, the compatibility of acidophilic autotrophic bacteria in the leaching of heavy metals would be desirable. Herein, three microorganisms including Acidithiobacillus ferrooxidans, Leptospirillum ferriphilum, Thiobacillus thiooxidans, and their mixed microbial consortium (MC) were applied to leach Cu from four waste resins and two pyrometallurgical slags. The bioleaching efficiencies as functions of bacteria species, kinetics and solid/liquid ratio were evaluated. Specifically, the utilization of MC promoted the bioleaching efficiencies with ratios of 97.2–99.2% from four waste resins, 99.5% from converter slag and 91.6% from flotation tailing. The kinetics were accelerated from 1.0 day to 0.5 day for waste resins and from 8.0 days to 6.0 days for pyrometallurgical slags. MC presented higher recovery efficiency (98.9% for Resin 2 and 97.7% for converter slag) and faster kinetic stability (0.5 day for Resin 2 and 6 days for converter slag) than single bacterium. MC improved the leached fraction and reduced the residual fraction of Cu in solid wastes. Face centered cubic Cu element existed in waste resins was bioleached effectively from waste resins using XRD analysis. This study paved a valuable way for the efficient treatment of solid wastes.