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Biological Purification of Silicate Minerals
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Deferrization of Kaolinic Sand by Iron Oxidizing and Iron Reducing Bacteria
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Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation
p.134
Monitoring of Hydrocarbon Gaseous Compounds formed During Bioleaching of Copper Sulphide Minerals with Mesophilic Microorganisms
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Bioleaching of a Mixed Copper Dust Emanating from Copper Smelters
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Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation

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Abstract:

The sphalerite-pyrite oxidation by Acidithiobacillus ferrooxidans was studied to analyze how the formation of the elemental sulfur layers occurs around sphalerite grains. Two possible mechanisms of formation have been raised. One mechanism corresponds to the formation of sulfur pseudomorphs where, both, iron and zinc have been leached of the sphalerite, whereas compound sulfur is oxidized, in situ, to elemental sulfur, leaving an unreacted core of sphalerite that remains in the center. Another mechanism consists in the dissolution of iron, zinc and sulfur presents. When the attack by Fe3+ as by H+ broken the S-metal bonds, sulfur is then oxidized to a series of sulfur intermediate compounds. These compounds in solution then are oxidized to elemental sulfur, which precipitates on sphalerite grains.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

134-138

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.134

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Online since:

July 2007

Authors:

Dioni Mabel Zapata, M.A. Márquez, D.M.H. Ossa

Keywords:

Acidithiobacillus ferrooxidans, Biooxidation Mechanisms, Diffusion, Elemental Sulfur, Pseudomorphous, Sphalerite

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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