Estimating the electrochemical reactivity of iron sulphide mineral and its impact on flotation pulp chemistry
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(Published version)
Date
2012
Authors
Owusu, C.
Zanin, M.
Fornasiero, D.
Addai Mensah, J.
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Journal Title
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Type:
Conference paper
Citation
Chemeca 2012 quality of life through chemical engineering : 23-26 September 2012, Wellington, New Zealand, 2012, pp.1-9
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Chemeca 2012 (23 Sep 2012 - 26 Sep 2012 : Wellington, New Zealand)
Abstract
Proper control of flotation pulp chemistry (redox potential, Eh, dissolved oxygen, DO and pH) can markedly improve the flotation recovery, grade and selectivity of sulphide minerals. In this paper, the electrochemical reactivity of two pyrite ores and its impact on the pulp chemistry of sulphide minerals are explored using DO demand tests. Changes in the surface chemistry/speciation are also investigated using EDTA extraction technique.The DO demand test shows that different pyrite ores display significantly different electrochemical reactivity. Continuous aeration of the pulp reduces pyrite reactivity.Solution analysis results suggest the formation of oxide/hydroxide surface coatings onthe pyrite surface as aeration time increases, preventing or minimising further oxidativere actions from taking place in the pulp.