Feasibility Study of Metal Bioleaching in a Gold-Rich Ore Sample by Acidithiobacillus thiooxidans DSM 26636

José Daniel Aguilar Loa, Andrea Margarita Rivas-Castillo, Luis Angel García-Tejeda, Marlenne Gómez-Ramírez, Luz Irene Rojas-Avelizapa, Norma Gabriela Rojas-Avelizapa

Research output: Contribution to journalArticlepeer-review

Abstract

Acidithiobacillus thiooxidans has been used in bioleaching processes, being recognized for its high metal leaching ability from industrial wastes. In the present work, the sulfur-oxidizing activity of A. thiooxidans DSM 26636, adapted to increasing concentrations of ore was assessed, finding that at 28 days with 3% (w/v) of ore sample, the culture produces high amounts of the sulfate ion (SO4−2) and sulfuric acid (H2SO4) and causes a decrease in the pH value, compared to the negative control. Also, there was observed a net removal of As, Zn, Fe, Al, Cu, and Au in concentrations of 48.23 ± 3.11, 264.02 ± 26.27, 9055.81 ± 210.39, 605.29 ± 30.26, 2158 ± 359.04, and 0.99 ± 0.37 mg/kg, respectively. Thus, the present work shows the potential of A. thiooxidans DSM 26636 to be used for the extraction of metals contained in ores, especially for those containing Cu, Zn, As, Fe, and Al.

Original languageEnglish
JournalTransactions of the Indian Institute of Metals
DOIs
StateAccepted/In press - 2021

Keywords

  • Acidithiobacillus thiooxidans
  • Bioleaching
  • Gold ore
  • Sulfur oxidation

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