Surface chemical and adsorption studies using Thiobacillus ferrooxidans with reference to bacterial adhesion to sulfide mineralsShow others and affiliations
1999 (English)In: Biohydrometallurgy and the Environment toward the Mining of the 21st century: Proceedings of the International Biohydrometallurgy Symposium IBS 1999, Madrid, Spain / [ed] R. Amils; A. Ballester, Elsevier, 1999, Vol. 9, Part A: Bioleaching, Microbiology, p. 697-707Conference paper, Published paper (Refereed)
Abstract [en]
Adhesion of Thiobacillus ferrooxidans to pyrite and chalcopyrite in relation to its importance in bioleaching and bioflotation has been studied. Electrokinetic studies as well as FT-IR spectra suggest that the surface chemistry of Thiobacillus ferrooxidans depends on bacterial growth conditions. Sulfur-,Pyrite- and chalcopyrite-grown Thiobacillus ferrooxidans were found to be relatively more hydrophobic. The altered surface chemistry of Thiobacillus ferrooxidans was due to secretion of newer and specific proteinaceous compounds. The adsorption density corresponds to a monolayer coverage in a horizontal orientation of the cells. The xanthate flotation of pyrite in presence of Thiobacillus ferrooxidans is strongly depressed where as the cells have insignificant effect on chalcopyrite flotation. This study demonstrate that:(a)Thiobacillus ferrooxidans cells can be used for selective flotation of chalcopyrite from pyrite and importantly at natural pH values.(b)Sulfur-grown cells exhibits higher leaching kinetics than ferrous ion-grown cells.
Place, publisher, year, edition, pages
Elsevier, 1999. Vol. 9, Part A: Bioleaching, Microbiology, p. 697-707
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-30390DOI: 10.1016/S1572-4409(99)80072-8Scopus ID: 2-s2.0-77957078189Local ID: 42be3c60-b0e0-11de-8293-000ea68e967bISBN: 0-444-50193-2 (print)OAI: oai:DiVA.org:ltu-30390DiVA, id: diva2:1003617
Conference
International Biohydrometallurgy Symposium : 20/06/1999 - 23/06/1999
Note
Godkänd; 1999; 20091004 (hrao)
2016-09-302016-09-302022-05-04Bibliographically approved