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. (2006). The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides. In: Graeme J. Jameson, Minerals Engineering: Selected papers from the Centenary of Flotation Symposium. Centenary of Flotation Symposium, Brisbane, Australia, (675-686). 6–9 June 2005. doi:10.1016/j.mineng.2005.09.043


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, Australia
Conference dates 6–9 June 2005
Proceedings title Minerals Engineering: Selected papers from the Centenary of Flotation Symposium   Check publisher's open access policy
Journal name Minerals Engineering   Check publisher's open access policy
Place of Publication Oxford, U.K.
Publisher Pergamon
Publication Year 2006
Sub-type Fully published paper
DOI 10.1016/j.mineng.2005.09.043
ISSN 0892-6875
1872-9444
Editor Graeme J. Jameson
Volume 19
Issue 6-8
Start page 675
End page 686
Total pages 12
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. Copyright © 2005 Elsevier Ltd All rights reserved.
Subjects 0914 Resources Engineering and Extractive Metallurgy
Keyword Surface modification
Flotation activators
Oxidation
Sulfide ores
Precious metal ores
Q-Index Code E1
Additional Notes Available online 2 November 2005. -- "Selected papers from the Centenary of Flotation Symposium, 5–9 June 2005, Brisbane, Australia"

 
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Created: Wed, 13 Jan 2010, 19:13:35 EST by Gerald Martin on behalf of Sustainable Minerals Institute