How fine particles on haematite mineral ultimately define the mineral surface charge and the overall floatability behaviour

Montes, S., Montes-Atenas, G. and Valero, E (2007) How fine particles on haematite mineral ultimately define the mineral surface charge and the overall floatability behaviour. Journal of the South African Institute of Mining and Metallurgy, 107 11: 689-696.


Author Montes, S.
Montes-Atenas, G.
Valero, E
Title How fine particles on haematite mineral ultimately define the mineral surface charge and the overall floatability behaviour
Journal name Journal of the South African Institute of Mining and Metallurgy   Check publisher's open access policy
ISSN 0038-223X
Publication date 2007
Sub-type Article (original research)
Volume 107
Issue 11
Start page 689
End page 696
Total pages 8
Editor R. E. Robinson
Place of publication Marshaltown, South Africa
Publisher South African Institute of Mining and Metallurgy
Language eng
Subject 0914 Resources Engineering and Extractive Metallurgy
091405 Mining Engineering
Abstract Mineral floatability is strongly connected with mineral structure and composition. The complexity of mineral surfaces has meant that few attempts have been made to understand the effect of impurities(trace elements) on the flotation process. Zeta potential technique has been extensively used to evaluate the surface charge of mineral particles. Nevertheless, those measurements consider only anaverage of mineral particles surface charge. The presence of fine particles and inclusions covering a mineral may influence the local reagent adsorption process, which will ultimately be reflected in the subsequent global response of the mineral froth flotation efficiency. The current work assesses the iron oxide mineral, haematite (Fe2O3). Zeta potential and streaming potential techniques were used to determine the surface charge of fine and coarser particles of haematite. Further analysis was performed to determine the point of zero charge (PZC) of the mineral. In addition, adsorption isotherms of alkylammonium chloride reagents with different lengths of carbon chains were carried out. It was found haematite floatability depends strongly on the isoelectric point (IEP) value, which is affected by other mineral species present at the mineral surface. Haematite floatability became significant only at relatively high tetradecyl ammonium chloride collector concentrations (concentration greater than 4 10-4 M), which does not happen with other oxides such as quartz. Unlike quartz, haematite develops a low surface charge over a wide range of pH, disabling all long-range attractive interactions between the mineral and the collector. Therefore, hydrophobic chain interaction is probably the most likely mechanism acting to promote collector adsorption and enhance further floatability. Diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to suggest a possible mechanism to understand the sequence of collector adsorption and the effect of trace species on it.
Keyword Floatability
Haematite
Adsorption
Electrochemistry
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Excellence in Research Australia (ERA) - Collection
 
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Created: Mon, 18 Jan 2010, 16:16:18 EST by Rosalind Blair on behalf of Sustainable Minerals Institute