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Questions and Answers

What is the critical bacterial oxidation involved in microbial leaching of copper?

  • Oxidation of copper ion (Cu3+) to cuprous ion (Cu2+)
  • Oxidation of ferric ion (Fe3+) to ferrous ion (Fe2+)
  • Oxidation of copper ion (Cu2+) to cupric ion (Cu3+)
  • Oxidation of ferrous ion (Fe2+) to ferric ion (Fe3+) (correct)

    • What is the primary bacterial species involved in uranium leaching?

  • Pseudomonas aeruginosa
  • Leptospirillum ferrooxidans
  • Acidithiobacillus thiooxidans
  • Acidithiobacillus ferrooxidans (correct)

    • What is the form in which uranium becomes highly soluble during leaching?

  • Uranium oxide (UO3)
  • Uranyl sylfate (UO2SO4) (correct)
  • Uranium hydroxide (U(OH)4)
  • Uranium chloride (UCl4)

    • What is the role of Acidithiobacillus ferrooxidans in gold leaching?

    <p>Leaching the arsenic and pyrite</p> Signup and view all the answers

    What is the primary method used for microbial leaching of copper?

    <p>Dumping low-grade ore in a large pile and adding dilute sulfuric acid</p> Signup and view all the answers

    What percentage of worldwide copper mining is obtained by microbial leaching?

    <p>About a quarter</p> Signup and view all the answers

    What is the pH of the dilute sulfuric acid added in microbial leaching of copper?

    <p>pH 2</p> Signup and view all the answers

    What is the primary function of the precipitation pond in microbial leaching of copper?

    <p>To enrich the liquid emerging from the bottom of the pile in dissolved metals</p> Signup and view all the answers

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