Paper Title:
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.

  Info
Periodical
Advanced Materials Research (Volumes 71-73)
Edited by
Edgardo R. Donati, Marisa R. Viera, Eduardo L. Tavani, María A. Giaveno, Teresa L. Lavalle, Patricia A. Chiacchiarini
Pages
365-368
DOI
10.4028/www.scientific.net/AMR.71-73.365
Citation
G. Jones, R. P. van Hille, S. T.L. Harrison, "Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance", Advanced Materials Research, Vols. 71-73, pp. 365-368, 2009
Online since
May 2009
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Price
$32.00
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