Paper Title:
Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation
  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.

  Info
Periodical
Advanced Materials Research (Volumes 20-21)
Edited by
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
Pages
134-138
DOI
10.4028/www.scientific.net/AMR.20-21.134
Citation
D. M. Zapata, M.A. Márquez, D.M.H. Ossa, "Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation", Advanced Materials Research, Vols. 20-21, pp. 134-138, 2007
Online since
July 2007
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$32.00
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