Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance

Gavin Jones; Robert P. van Hille; Susan T.L. Harrison

doi:10.4028/www.scientific.net/AMR.71-73.365

Paper Titles

Imaging of Acidithiobacillus Ferrooxidans by AFM and Analysis of AFM Curves
p.349

Effect of Sulfuric Acid Concentration on Chalcopyrite Concentrate Chemical Leaching
p.353

Studies on Thermophilic Bioleaching of Chalcopyrite toward Heap Application
p.357

Advances in Tank Bioleaching of Low-Grade Chalcopyrite Concentrates
p.361

Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance
p.365

Impacts of Mineralogy on the Chemistry and Microbiology of Heap Bioleaching
p.369

Changes in an Ore Dump during a 40-Year Period of Commercial-Scale and Spontaneous Natural Bioleaching
p.373

Investigations of Attached and Unattached Cells during Bioleaching of Chalcopyrite with Acidianus Manzaensis at 65°C
p.377

An Experimental Approach for Studying Chalcopyrite Leaching and Passivation in Column Bioleaching
p.381

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 71-73Sulfide Mineral Induced Oxidative Stress as a...

Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance

Abstract:

In tank bioleaching, decreasing particle size of milled concentrates has been shown to improve leaching performance owing to increased mineral surface area and mechanical activation effects of fine mineral particles. However, evidence suggests a critical lower limit of particle size distribution exists below which the performance of the thermophilic iron and sulfur oxidizer Sulfolobus metallicus is compromised and complete culture death may result. This paper proposes an explanation for these observations at fine fractions through identifying a relationship between mineral composition of six sulfide concentrates, their extent of milling and the generation of the reactive oxygen species (ROS) hydrogen peroxide (H2O2) and hydroxyl radicals (•OH) in slurries. The effect of oxidative stress induced in the absence of minerals on growth and bioleaching performance of S. metallicus is studied.

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Periodical:

Advanced Materials Research (Volumes 71-73)

Pages:

365-368

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.71-73.365

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Online since:

May 2009

Authors:

Gavin Jones, Robert P. van Hille, Susan T.L. Harrison

Keywords:

Oxidative Stress, Reactive Oxygen Species, Sulfide Concentrate, Sulfolobus Metallicus

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