Journal article
Redox potential control during flotation of a sulphide mineral ore

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Publication Details
Author list: Chimonyo W., Corin K., Wiese J., O'Connor C.
Publisher: Elsevier Ltd
Publication year: 2017
Journal: Minerals Engineering
Journal name: Minerals Engineering
Volume number: 110
Start page: 57
End page: 64
ISSN: 0892-6875


Redox potential (Eh) control can play a critical role during sulphide
mineral flotation by influencing the reactions on the surface of the
minerals and consequently the flotation behaviour. Such control is
usually a combined function of dissolved oxygen and pH control but can
also be achieved by using appropriate chemical modifiers. Batch
flotation tests using sodium hypochlorite (NaClO) as an oxidant were
conducted to investigate its effect as an alternative means of varying
redox potential in the pulp of a typical Merensky PGM ore. A change of
pH from the natural ore pH of 9–11 lowered the Eh from an average value
of 140 mV to values between 0 and 100 mV and resulted in a decrease in
the amount of solids recovered. On the other hand increasing the Eh at
constant pH resulted in a significant increase in solids and water
recovery. It was observed that for copper there was no significant
change in recovery for all the conditions investigated in this study.
Ultimately this study has shown that using NaClO to vary the redox
potential in the flotation of a Merensky ore did not have any effect on
recoveries but did result in a significant increase in the recoveries of
solids and water.

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Last updated on 2017-03-10 at 15:46