The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides

Newell, A. J. H., Bradshaw, D. J. and Harris, P. J. (2005). The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides. In: Graeme J. Johnson, Conference Proceedings: Centenary of Flotation Symposium. Centenary of Flotation Symposium, Brisbane, Queensland, (1007-1016). 6-9 June 2005.

Author Newell, A. J. H.
Bradshaw, D. J.
Harris, P. J.
Title of paper The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides
Conference name Centenary of Flotation Symposium
Conference location Brisbane, Queensland
Conference dates 6-9 June 2005
Proceedings title Conference Proceedings: Centenary of Flotation Symposium
Place of Publication Carlton South, Vic., Australia
Publisher Australasian Institute of Mining and Metallurgy (AusIMM)
Publication Year 2005
Sub-type Fully published paper
ISBN 9781920806316
Editor Graeme J. Johnson
Start page 1007
End page 1016
Total pages 10
Language eng
Abstract/Summary Surface oxidation of sulfide minerals, such as that found in the regions of a sulfide ore body near the water table, can have a significant impact upon flotation. This theme has been explored for Merensky ore type sulfides where an ore containing pyrrhotite, pentlandite and chalcopyrite was thermally oxidised and the role of potential remedies investigated. Back-scattered scanning electron microscope images are presented showing the oxidation layer which formed in the mineral surfaces. These oxidation layers were depleted in both sulfur and iron with incorporated oxygen. Flotation recovery rapidly decreased with increasing oxidation, particularly after 27 days and reached a plateau after 50 days. Up to 27 days, this effect could be partially overcome with higher collector additions. Oxidation had more impact upon the finer size fractions, particularly for pyrrhotite. For more heavily surface oxidised samples, ultrasonic treatment prior to collector conditioning was found to improve flotation recoveries. This treatment had the greatest effect upon chalcopyrite particles. Sulfidisation was successful in restoring the flotation recovery of the heavily oxidised sulfide minerals. Longer sulfidisation conditioning times were not conducive to good flotation recoveries of both oxidised pyrrhotite and pentlandite due to oxidation of the freshly formed sulfide surfaces. For maximum flotation recoveries of oxidised pyrrhotite, pentlandite and chalcopyrite, different sulfidisation conditions are indicated. It appears likely that in a mineral processing operation treating oxidised Merensky type ores, two stages of sulfidisation employing different conditions would be required.
Subjects 0914 Resources Engineering and Extractive Metallurgy
091404 Mineral Processing/Beneficiation
Keyword Surface modification
Flotation activators
Sulfide ores
Precious metal ores
Q-Index Code EX
Additional Notes Publication series (Australasian Institute of Mining and Metallurgy) ; 2005/5. -- Selected papers published in Minerals Engineering Volume 19, Issues 6-8, 2006

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Created: Wed, 03 Mar 2010, 11:50:33 EST by Maria Campbell on behalf of Julius Kruttschnitt Mineral Research Centre