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Minerals 2012, 2(4), 493-515; doi:10.3390/min2040493

The Adsorption of n-Octanohydroxamate Collector on Cu and Fe Oxide Minerals Investigated by Static Secondary Ion Mass Spectrometry

1,* , 2
1 School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia 2 Ian Wark Research Institute, University of South Australia, Mawson Lakes, SA 5046, Australia 3 Queensland Micro- and Nanotechnology Centre, School of Biomolecular and Physical Sciences, Griffith University, Nathan, QLD 4111, Australia
* Author to whom correspondence should be addressed.
Received: 12 September 2012 / Revised: 26 November 2012 / Accepted: 4 December 2012 / Published: 10 December 2012
(This article belongs to the Special Issue Advances in Mineral Processing)
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The feasibility of investigating the adsorption of n-octanohydroxamate collector on copper and iron oxide minerals with static secondary ion mass spectrometry has been assessed. Secondary ion mass spectra were determined for abraded surfaces of air-exposed copper metal, malachite, pseudomalachite and magnetite that had been conditioned in aqueous potassium hydrogen n-octanohydroxamate solution, as well as for the corresponding bulk CuII and FeIII complexes. In each case, the chemical species present at the solid/vacuum interface of a similarly prepared surface were established by X-ray photoelectron spectroscopy. The most abundant positive and negative metal-containing fragment ions identified for the bulk complexes were also found to be diagnostic secondary ions for the collector adsorbed on the oxide surfaces. The relative abundances of those diagnostic ions varied with, and could be rationalised by, the monolayer or multilayer coverage of the adsorbed collector. However, the precise mass values for the diagnostic ions were not able to corroborate the different bonding in the copper and iron hydroxamate systems that had been deduced from photoelectron and vibrational spectra. Parent secondary ions were able to provide supporting information on the co-adsorption of hydroxamic acid at each conditioned surface.
Keywords: flotation (surface chemistry); base metal minerals; reagents flotation (surface chemistry); base metal minerals; reagents
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Buckley, A.N.; Denman, J.A.; Hope, G.A. The Adsorption of n-Octanohydroxamate Collector on Cu and Fe Oxide Minerals Investigated by Static Secondary Ion Mass Spectrometry. Minerals 2012, 2, 493-515.

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