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Influence of Chelators on Iron Solubilization from Quartz and Feldspars by Bioleaching

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Abstract:

Ultra-fine iron particles are difficult to treat by conventional mineral processing methods. Thus bioleaching is an attractive alternative for effective removal of iron minerals. The removal of oxidic Fe-phases from industrial silicates via bioleaching needs to be optimized with regard to the rate of iron reduction and dissolution. A new role for chelators as the low addition of AQDS or NTA during bacterial quality improvement of non-metallics, resulted in stimulating of Fe dissolution under non-controlled anaerobic conditions. AQDS stimulated bacterial iron reduction and Fe2+ concentration in solution was higher than Fe3+. However, NTA non-stimulated iron reduction, but increased bacterial iron dissolution in form of Fe3+. Changes in iron removal from samples were used to assess the chelator effectiveness of the heterotrophic bioleaching process. Chelators might be added to iron-contaminated non-metallics during bioleaching processes for stimulation of rate of iron removal.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

87-90

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.87

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Online since:

July 2007

Authors:

Iveta Štyriaková

Keywords:

Bacillus, Bioleaching, Chelator, Iron, Silicate Minerals

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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