Pentlandite-feldspar interaction and its effect on separation

Malysiak, V., O'Connor, C.T., Ralston, J., Gerson, A., Coetzer, L. P. and Bradshaw, D. J. (2002) Pentlandite-feldspar interaction and its effect on separation. International Journal of Mineral Processing, 66 1-4: 89-106. doi:10.1016/S0301-7516(02)00007-8


Author Malysiak, V.
O'Connor, C.T.
Ralston, J.
Gerson, A.
Coetzer, L. P.
Bradshaw, D. J.
Title Pentlandite-feldspar interaction and its effect on separation
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2002
Year available 2002
Sub-type Article (original research)
DOI 10.1016/S0301-7516(02)00007-8
Open Access Status
Volume 66
Issue 1-4
Start page 89
End page 106
Total pages 18
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2002
Language eng
Formatted abstract
The major loss of PGM and base metals in beneficiation of the Merensky Reef ore occurs during the separation of the siliceous gangue from the base metal sulphides and PGM minerals by selective flotation. The predominant gangue minerals in Merensky ores fed to the PGM concentrators are pyroxene and feldspar. Other important gangue minerals are talc and chlorite. A significant percentage of these minerals reports to the concentrate, thus diluting the concentrate grade and ultimately increasing the transport and smelting costs. Feldspar is naturally hydrophilic and requires activation for flotation. The present work investigates how collector adsorption (sodium isobutyl xanthate), copper sulphate activation, and the distribution of ions on mineral surfaces may influence selectivity in the flotation of these ores. The possible chemical reactions taking place on the surface of synthetic pentlandite, natural feldspar, and a 1:1 mixture were investigated. In the pH range studied, zeta potential and time of flight secondary ion mass spectrometry (ToF-SIMS) analyses indicated the presence of xanthate and copper ions on pentlandite surfaces. Xanthate ions did not adsorb onto feldspar surfaces. However, at pH 9, feldspar surfaces became coated with copper species and the subsequent adsorption of xanthate ions caused the feldspar to float. The results are explained in terms of the interaction between various copper and xanthate species present and the zeta potentials of the minerals at the pH values of interest
Keyword Feldspar
Flotation
Pentlandite
Zeta potential
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Mon, 08 Dec 2014, 13:56:21 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre