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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Sequential biological process for molybdenum extraction from hydrodesulphurization spent catalyst.

Shruti Vyas1, Yen-Peng Ting1

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore.

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|June 29, 2016
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Summary

This study presents a two-stage bioleaching process for enhanced molybdenum (Mo) extraction from spent catalysts. The novel method uses Acidithiobacillus ferrooxidans and Escherichia coli for efficient metal recovery, offering an eco-friendly alternative.

Keywords:
Acidithiobacillus ferrooxidansEscherichia coliKinetic modellingSequential bioleachingSpent catalyst

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Area of Science:

  • Biotechnology
  • Metallurgy
  • Environmental Science

Background:

  • Spent hydrodesulphurization catalyst contains valuable metals like Molybdenum (Mo), Nickel (Ni), and Aluminium (Al).
  • Conventional bioleaching using Acidithiobacillus ferrooxidans often results in low Mo recovery.
  • Chemical leaching methods for Mo extraction can be environmentally hazardous.

Purpose of the Study:

  • To develop an enhanced, sequential bioleaching process for improved Mo extraction from spent catalyst.
  • To selectively recover Ni in the first stage and Mo in the second stage.
  • To evaluate the environmental benefits compared to chemical leaching.

Main Methods:

  • A two-stage sequential bioleaching process was employed.
  • First stage: Bioleaching with Acidithiobacillus ferrooxidans.
  • Second stage: Bioleaching of the remaining Mo using Escherichia coli.

Main Results:

  • The first stage achieved 89.4% Ni, 20.9% Mo, and 12.7% Al extraction in 15 days.
  • The second stage successfully extracted 99% of the remaining Mo in 25 days.
  • Kinetic modeling indicated chemical reaction control in the first stage and product layer diffusion in the second.

Conclusions:

  • The sequential bioleaching strategy effectively enhances Mo extraction.
  • This method offers selective metal recovery (Ni then Mo).
  • It presents a more environmentally friendly alternative to chemical leaching for Mo recovery.