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Permanent link (DOI): https://doi.org/10.7939/R3DR2PM08

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Chitosan in differential flotation of base metal sulfides Open Access

Descriptions

Other title
Subject/Keyword
sulfides
differential
chitosan
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Huang, Peng
Supervisor and department
Liu, Qi (Chemical and Materials Engineering)
Examining committee member and department
Joseph Tim (Civil and Environmental Engineering)
Choi, Philip (Chemical and Materials Engineering)
Prasad, Vinay (Chemical and Materials Engineering)
Liu, Qi (Chemical and Materials Engineering)
Zeng, Hongbo (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2013-08-02T15:19:27Z
Graduation date
2013-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
Chitosan, a naturally occurring polymer, was studied as a potential selective depressant in the differential flotation of sulfide minerals. In single mineral flotation tests, chalcopyrite, galena, sphalerite and pyrite were depressed to different extents. However, in the differential flotation of the sulfide mineral mixtures (Cu-Pb, Zn-Pb and Fe-Pb), chitosan selectively depressed chalcopyrite, sphalerite or pyrite while galena was selectively floated using xanthate as a collector. To delineate the adsorption mechanisms of chitosan on the sulfide minerals, several surface analysis techniques were applied. Time-of-flight secondary ion mass spectrometric (ToF-SIMS) measurements were conducted to map chitosan distribution on the different mineral surfaces within a mineral mixture. The ToF-SIMS measurements showed that chitosan preferentially adsorbed on chalcopyrite, sphalerite or pyrite but not on galena in the chalcopyrite-galena, sphalerite-galena and pyrite-galena mixtures. X-ray photoelectron spectroscopic (XPS) analyses were performed to study the adsorption mechanisms between chitosan and the sulphide minerals. High resolution binding energy spectra of N 1s and O 1s electrons were obtained for chitosan-treated chalcopyrite, sphalerite, pyrite, and galena. The spectra showed chemical shifts of the N 1s electrons of the protonated amine groups and the O 1s electrons of the hydroxyl groups from chitosan. Therefore it was concluded that the selective adsorption of chitosan on chalcopyrite, sphalerite and pyrite was due to a strong chemical interaction between the surface copper, zinc or iron atoms and the amine and the hydroxyl groups on chitosan. No such a strong interaction was observed between galena and chitosan. The competitive adsorption was attributed to the differences in the electron affinity of the lattice metal ions. Chitosan was found to bind strongly with metal ions with a high electron affinity.
Language
English
DOI
doi:10.7939/R3DR2PM08
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
P. Huang, M. Cao and Qi Liu, 2012. Using chitosan as a selective depressant in the differential flotation of Cu-Pb sulfides. International Journal of Mineral Processing, Vol. 106-109, 8-15

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