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<p>Chalcopyrite is the most abundant copper minerals on earth, but unlike secondary copper sulfides, the bioleaching rate of chalcopyrite ores is still insufficient for industrial applications. Researchers have explored the use of additives, such as surfactants, to enhance the bioleaching rate of chalcopyrite ores, but have not linked with the influence of microbiology and its influence to concomitant pyrite oxidation. This study compared the effects of adding various surfactants to chalcopyrite and pyrite leaching in the ore, influenced by the microbial community and activity. It showed that when using surfactants to promote chalcopyrite leaching, their effects on the bioleaching microorganisms and redox potential largely determine the oxidation rates. In particular, the first time reported addition of sodium lignosulfonate (SLS) and cetyltrimethylammonium bromide (CTAB) increased the final copper leaching rate by 64.4% and 36.9%, respectively, and polyoxyethylene (12) nonyl phenyl ether (NP12) increased the final copper leaching rate by 26.2% at the dosage of 100&#xa0;mg/L, whereas Tween 80, Span 80, polyethylene glycol (PEG), and polyethylene glycol dimethyl ether (NHD) inhibited chalcopyrite leaching by 39.8%, 52.1%, 28.2%, and 30.7%, respectively, because of their inhibition effect on microbial activity at the dosage of 100&#xa0;mg/L. The rate of pyrite oxidation varied from 11.5 to 88.1% because it was intimately linked to the redox potential, which was regulated by the microbial activity impacted by surfactants. The study highlights the importance of considering the impact on the activity of bioleaching microorganisms when inputting surfactants to chalcopyrite bioleaching and also gives implications for AMD inhibition.</p>

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Comparison Study of Surfactants on Chalcopyrite Ore Bioleaching: Linking Microbiology with Mineral Oxidation

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Yan Jia,
  • Luohu Zhang,
  • Chuangang Zhong,
  • Zhentang Wang,
  • Qiru Yang,
  • Qiaoyi Tan,
  • Renman Ruan,
  • Jingkui Qu

摘要

Chalcopyrite is the most abundant copper minerals on earth, but unlike secondary copper sulfides, the bioleaching rate of chalcopyrite ores is still insufficient for industrial applications. Researchers have explored the use of additives, such as surfactants, to enhance the bioleaching rate of chalcopyrite ores, but have not linked with the influence of microbiology and its influence to concomitant pyrite oxidation. This study compared the effects of adding various surfactants to chalcopyrite and pyrite leaching in the ore, influenced by the microbial community and activity. It showed that when using surfactants to promote chalcopyrite leaching, their effects on the bioleaching microorganisms and redox potential largely determine the oxidation rates. In particular, the first time reported addition of sodium lignosulfonate (SLS) and cetyltrimethylammonium bromide (CTAB) increased the final copper leaching rate by 64.4% and 36.9%, respectively, and polyoxyethylene (12) nonyl phenyl ether (NP12) increased the final copper leaching rate by 26.2% at the dosage of 100 mg/L, whereas Tween 80, Span 80, polyethylene glycol (PEG), and polyethylene glycol dimethyl ether (NHD) inhibited chalcopyrite leaching by 39.8%, 52.1%, 28.2%, and 30.7%, respectively, because of their inhibition effect on microbial activity at the dosage of 100 mg/L. The rate of pyrite oxidation varied from 11.5 to 88.1% because it was intimately linked to the redox potential, which was regulated by the microbial activity impacted by surfactants. The study highlights the importance of considering the impact on the activity of bioleaching microorganisms when inputting surfactants to chalcopyrite bioleaching and also gives implications for AMD inhibition.