Bacterial oxidation pretreatment process for arsenic gold ore

Bacterial oxidation pretreatment process for arsenic gold ore

The bacterial pre oxidation treatment method can use three strains of bacteria, including Thiobacillus ferrooxidans, Thiobacillus ferrooxidans, and Leptospira ferrooxidans, to combine two and three strains for ore leaching. Generally, after biological oxidation pretreatment, the gold leaching rate is high, and after bacterial oxidation pretreatment, the arsenic removal rate of gold is high and the weight loss rate is good. The gold cyanide leaching rate of the ore is significant. However, bacterial oxidation has the disadvantage of long processing cycles.

process flow

  • 1.Ore preparation:Crush and grind the gold ore into powder to increase its contact area with bacteria.
  • 2.Biological oxidation:Mix ore powder with a culture medium containing the aforementioned bacteria and place it in a bioreactor for biological oxidation. During this process, bacteria oxidize sulfides and arsenides, while dissolving gold from the ore.
  • 3.Leaching: After biological oxidation pretreatment, the slurry is leached to dissolve gold and other valuable metal ions into the solution.
  • 4.Solid separation:Separate the leached solid from the solution and further treat it to extract gold.

Technological advantages

  • 1.High gold leaching rate:After bacterial oxidation pretreatment, the gold leaching rate is high, which improves the efficiency of gold extraction.
  • 2.High arsenic removal rate:Bacterial oxidation pretreatment can effectively remove arsenic and reduce its impact on the environment.
  • 3.Good weight loss rate:Bacterial oxidation pretreatment can effectively dissociate gold from the ore, resulting in a good weight loss rate.
  • 4.Significant gold cyanide leaching rate:After bacterial oxidation pretreatment, the ore has a significant gold cyanide leaching rate, which is beneficial for the subsequent gold extraction process.
  • Bacterial oxidation pretreatment also has some drawbacks, such as a longer treatment cycle, which may affect the efficiency of the entire process. However, due to its high gold leaching rate, arsenic removal rate, and good weight loss rate, the arsenic gold bacterial oxidation pretreatment process is still an effective gold treatment method.