Schwertmannite precipitated from acid mine drainage: phase transformation, sulphate release and surface properties
(2005) In Applied Geochemistry 20. p.179-191- Abstract
- Schwertmannite precipitated from acid mine drainage at the Kristineberg Zn-Cu mine in northern Sweden has been characterised regarding elemental composition, phase transformation as a function of pH and time. SO42- release and speciation of SO42- associated with the solid. The elemental analysis gave the composition FeSOS(OH)(5.02)(-SO4)(1.49) . 0.5H(2)O where approximately 1/3 of the SO42- is adsorbed to the surface. The conversion of schwertmannite to goethite at pH 9 was complete within 187 days; at pH 6. the conversion was still incomplete after 514 days. Lower pH and relatively high SO42- concentration decreased the conversion even further. Also temperature was shown to be an important parameter for this process and low temperature... (More)
- Schwertmannite precipitated from acid mine drainage at the Kristineberg Zn-Cu mine in northern Sweden has been characterised regarding elemental composition, phase transformation as a function of pH and time. SO42- release and speciation of SO42- associated with the solid. The elemental analysis gave the composition FeSOS(OH)(5.02)(-SO4)(1.49) . 0.5H(2)O where approximately 1/3 of the SO42- is adsorbed to the surface. The conversion of schwertmannite to goethite at pH 9 was complete within 187 days; at pH 6. the conversion was still incomplete after 514 days. Lower pH and relatively high SO42- concentration decreased the conversion even further. Also temperature was shown to be an important parameter for this process and low temperature (+4 degreesC) effectively stopped the transformation at pH 3. The release of SO42- was linear with pH and X-ray photoelectron spectroscopy measurements confirming that the surface bound SO42- was released before bulk SO42-. Zeta potential measurements indicate a pH(IEP) of 7.2 for the schwertmannite sample. Prior to conversion into goethite, the SO42- associated with schwertmannite was indicated by attenuated total reflectance FTIR spectroscopy to be present both as bulk and surface species. Furthermore: the speciation of surface SO42- was shown to vary with pH and two predominating species were detected. As pH increases. SO42- is increasingly Coordinated in an outer sphere mode whereas a stronger. possibly inner sphere, complex dominates. at low pH. (C) 2004 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4332513
- author
- Jonsson, J. ; Persson, Per LU ; Sjoberg, S. and Lovgren, L.
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Geochemistry
- volume
- 20
- pages
- 179 - 191
- publisher
- Elsevier
- external identifiers
-
- scopus:9644276982
- ISSN
- 0883-2927
- DOI
- 10.1016/j.apgeochem.2004.04.008
- language
- English
- LU publication?
- no
- additional info
- 1
- id
- 44ea2e4e-58cd-4ffb-b185-f40bf6419eac (old id 4332513)
- date added to LUP
- 2016-04-01 12:21:19
- date last changed
- 2022-04-21 06:16:08
@article{44ea2e4e-58cd-4ffb-b185-f40bf6419eac, abstract = {{Schwertmannite precipitated from acid mine drainage at the Kristineberg Zn-Cu mine in northern Sweden has been characterised regarding elemental composition, phase transformation as a function of pH and time. SO42- release and speciation of SO42- associated with the solid. The elemental analysis gave the composition FeSOS(OH)(5.02)(-SO4)(1.49) . 0.5H(2)O where approximately 1/3 of the SO42- is adsorbed to the surface. The conversion of schwertmannite to goethite at pH 9 was complete within 187 days; at pH 6. the conversion was still incomplete after 514 days. Lower pH and relatively high SO42- concentration decreased the conversion even further. Also temperature was shown to be an important parameter for this process and low temperature (+4 degreesC) effectively stopped the transformation at pH 3. The release of SO42- was linear with pH and X-ray photoelectron spectroscopy measurements confirming that the surface bound SO42- was released before bulk SO42-. Zeta potential measurements indicate a pH(IEP) of 7.2 for the schwertmannite sample. Prior to conversion into goethite, the SO42- associated with schwertmannite was indicated by attenuated total reflectance FTIR spectroscopy to be present both as bulk and surface species. Furthermore: the speciation of surface SO42- was shown to vary with pH and two predominating species were detected. As pH increases. SO42- is increasingly Coordinated in an outer sphere mode whereas a stronger. possibly inner sphere, complex dominates. at low pH. (C) 2004 Elsevier Ltd. All rights reserved.}}, author = {{Jonsson, J. and Persson, Per and Sjoberg, S. and Lovgren, L.}}, issn = {{0883-2927}}, language = {{eng}}, pages = {{179--191}}, publisher = {{Elsevier}}, series = {{Applied Geochemistry}}, title = {{Schwertmannite precipitated from acid mine drainage: phase transformation, sulphate release and surface properties}}, url = {{http://dx.doi.org/10.1016/j.apgeochem.2004.04.008}}, doi = {{10.1016/j.apgeochem.2004.04.008}}, volume = {{20}}, year = {{2005}}, }