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<p>We present an environmentally friendly biohydrometallurgical method for extracting gold from silicate ores, utilizing two amino acid-producing bacteria, <i>Macrococcus caseolyticus</i> and <i>Acinetobacter calcoaceticus</i>. Our study introduces novel methodologies involving the co-cultivation and mixed cell-free suspension of these bacteria. Additionally, we conducted a comparative analysis of culture media, finding that Luria–Bertani (LB) medium outperformed nutrient broth (NB) due to its richer important nutrient composition. Notably, this study represents the first investigation into a two-step bioleaching method employing these bacteria. Our findings reveal that two-step bioleaching yields higher gold bioleaching efficiency compared to spent medium bioleaching, attributed to the active role of bacteria during the bioleaching process. The maximum gold bioleaching yield attained was approximately 40% using the two-step bioleaching approach with <i>M. caseolyticus</i> at 4% pulp density, 30&#xa0;°C, and 150&#xa0;rpm over 7&#xa0;days. Our work presents a novel approach to gold extraction from silicate ore using a two-step bioleaching process with amino acid-producing bacteria, showcasing the potential of green biological extraction technology for sustainable and efficient practices in biohydrometallurgy.</p> Graphical Abstract <p></p>

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Comparison of Gold Extraction from Silicate Ores using Two-Step Bioleaching and Spent Medium of Co-Culture/Mixing Cell-Free Suspensions of Amino Acid-Producing Bacteria

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Natrawee Khetwunchai,
  • Saengchai Akeprathumchai,
  • Paitip Thiravetyan

摘要

We present an environmentally friendly biohydrometallurgical method for extracting gold from silicate ores, utilizing two amino acid-producing bacteria, Macrococcus caseolyticus and Acinetobacter calcoaceticus. Our study introduces novel methodologies involving the co-cultivation and mixed cell-free suspension of these bacteria. Additionally, we conducted a comparative analysis of culture media, finding that Luria–Bertani (LB) medium outperformed nutrient broth (NB) due to its richer important nutrient composition. Notably, this study represents the first investigation into a two-step bioleaching method employing these bacteria. Our findings reveal that two-step bioleaching yields higher gold bioleaching efficiency compared to spent medium bioleaching, attributed to the active role of bacteria during the bioleaching process. The maximum gold bioleaching yield attained was approximately 40% using the two-step bioleaching approach with M. caseolyticus at 4% pulp density, 30 °C, and 150 rpm over 7 days. Our work presents a novel approach to gold extraction from silicate ore using a two-step bioleaching process with amino acid-producing bacteria, showcasing the potential of green biological extraction technology for sustainable and efficient practices in biohydrometallurgy.

Graphical Abstract