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Reaction kinetics and oxidation mechanisms of the conversion of pyrite to ferrous sulphate: A Mossbauer spectroscopy study

Ferrow, Embaie LU ; Mannerstrand, Maria LU and Sjoberg, B (2005) In Hyperfine Interactions 163(1-4). p.109-119
Abstract
Pyrite undergoes a series of exothermic reactions during mine roasting to porous hematite. At low temperatures, the first non-refractive phase to form is ferrous sulphate and could be a cheaper alternative to hematite roasting for the mining industry. In this study, pyrite powder is heated in air at temperatures between 200 and 370 degrees C for 1 to 256 h in a temperature and time series. The rate of oxidation of pyrite to ferrous sulphate is modelled by combining the Arrhenius equation with the Weibull function to extract reliable thermodynamic data, including the energy of activation, the frequency factor and the overall order of reaction. From the thermodynamic data obtained, two possible oxidation mechanisms are recognized, depending... (More)
Pyrite undergoes a series of exothermic reactions during mine roasting to porous hematite. At low temperatures, the first non-refractive phase to form is ferrous sulphate and could be a cheaper alternative to hematite roasting for the mining industry. In this study, pyrite powder is heated in air at temperatures between 200 and 370 degrees C for 1 to 256 h in a temperature and time series. The rate of oxidation of pyrite to ferrous sulphate is modelled by combining the Arrhenius equation with the Weibull function to extract reliable thermodynamic data, including the energy of activation, the frequency factor and the overall order of reaction. From the thermodynamic data obtained, two possible oxidation mechanisms are recognized, depending on the bond dissociation energies of the S-S and Fe-S bonds in pyrite. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
mechanisms, activation energy, ferrous sulphate, Mossbauer, pyrite
in
Hyperfine Interactions
volume
163
issue
1-4
pages
109 - 119
publisher
Springer
external identifiers
  • wos:000238519200008
  • scopus:33745509178
ISSN
1572-9540
DOI
10.1007/s10751-005-9200-6
language
English
LU publication?
yes
id
e226be40-b0c2-42d6-8ae8-6b3aabe507d2 (old id 404945)
date added to LUP
2007-08-23 14:07:12
date last changed
2017-01-01 05:14:25
@article{e226be40-b0c2-42d6-8ae8-6b3aabe507d2,
  abstract     = {Pyrite undergoes a series of exothermic reactions during mine roasting to porous hematite. At low temperatures, the first non-refractive phase to form is ferrous sulphate and could be a cheaper alternative to hematite roasting for the mining industry. In this study, pyrite powder is heated in air at temperatures between 200 and 370 degrees C for 1 to 256 h in a temperature and time series. The rate of oxidation of pyrite to ferrous sulphate is modelled by combining the Arrhenius equation with the Weibull function to extract reliable thermodynamic data, including the energy of activation, the frequency factor and the overall order of reaction. From the thermodynamic data obtained, two possible oxidation mechanisms are recognized, depending on the bond dissociation energies of the S-S and Fe-S bonds in pyrite.},
  author       = {Ferrow, Embaie and Mannerstrand, Maria and Sjoberg, B},
  issn         = {1572-9540},
  keyword      = {mechanisms,activation energy,ferrous sulphate,Mossbauer,pyrite},
  language     = {eng},
  number       = {1-4},
  pages        = {109--119},
  publisher    = {Springer},
  series       = {Hyperfine Interactions},
  title        = {Reaction kinetics and oxidation mechanisms of the conversion of pyrite to ferrous sulphate: A Mossbauer spectroscopy study},
  url          = {http://dx.doi.org/10.1007/s10751-005-9200-6},
  volume       = {163},
  year         = {2005},
}