The direct and indirect effects of the reagent suite on froth stability in laboratory scale batch flotation tests

Wiese, J., Harris, P. and Bradshaw, Dee J. (2010). The direct and indirect effects of the reagent suite on froth stability in laboratory scale batch flotation tests. In: XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future. International Mineral Processing Congress 2010, Brisbane, Qld, Australia, (2551-2560). 6-10 September, 2010.

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Author Wiese, J.
Harris, P.
Bradshaw, Dee J.
Title of paper The direct and indirect effects of the reagent suite on froth stability in laboratory scale batch flotation tests
Conference name International Mineral Processing Congress 2010
Conference location Brisbane, Qld, Australia
Conference dates 6-10 September, 2010
Convener Ralph J. Holmes
Proceedings title XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future
Journal name XXV International Mineral Processing Congress 2010, IMPC 2010
Place of Publication Carlton, VIC, Australia
Publisher Australasian Institute of Mining and Metallurgy
Publication Year 2010
Year available 2010
Sub-type Fully published paper
ISBN 9781921522284
Volume 4
Start page 2551
End page 2560
Total pages 10
Collection year 2011
Language eng
Abstract/Summary In batch flotation tests conducted on ores from the Merensky Reef, changes in froth stability invariably occur with variations in the reagent suite. The main reagents are collectors (primary and secondary), activators, depressants and frothers. Of these reagents, frother alone has a direct effect on froth stability, whereas other reagents influence the nature of the particles entering the froth phase thus influencing froth stability indirectly. Since the particles entering and leaving the froth in a batch flotation system are continuously changing, the stability of the froth can vary. Under these conditions the simplest measure of froth stability is the measure of water recovery at a fixed froth height. The batch flotation system developed at UCT allows for the separation of gangue, which is entrained relative to gangue which is floated. It has been found that the presence of naturally floatable gangue (NFG) leads to froth stabilisation, whereas the presence of hydrophobic sulfide minerals may lead to destabilisation of the froth, depending on the hydrophobicity (contact angle) of the sulfide minerals. This can vary with ore type since particle shape and amount of particles present can influence the extent of destabilisation. At low depressant dosages sodium isobutyl xanthate (SIBX) always results in lower froth stability than sodium ethyl xanthate (SEX). The frothing nature of dithiophosphate leads to increased froth stability and the addition of copper sulfate results in destabilised froths. Increasing depressant dosage reduces the stabilising influence of NFG and the depressant type (guar or CMC) also affects froth stability. Frother can be used in an attempt to directly overcome the destabilising effects of high depressant dosage. This work examines the effect of variations in the reagent suite and uses water recovery to analyse these effects on the recovery of sulfide minerals, floatable gangue and entrained gangue.
Keyword Froth flotation
Flotation collectors
Flotation frothers
Flotation depressants
Flotation
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 20 Dec 2010, 14:26:14 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre