Diethylenetriamine depression of Cu-activated pyrite hydrophobised by xanthate |
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| Affiliation: | 1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada;1. Department of Mineral Engineering, University of Mines and Technology, P.O. Box 237, Tarkwa, Ghana;2. Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Adelaide, SA 5095, Australia |
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| Abstract: | In copper sulphide flotation, copper adsorbs on pyrite through superficial oxidation of the copper minerals (e.g. chalcopyrite) which promotes pyrite flotation in the presence of xanthate. This “inadvertent” activation of pyrite by copper ions is undesirable in copper sulphide flotation. In order to minimise this effect, depressants are used to suppress the effect of the activating ions. The effect of diethylenetriamine (DETA) in different combinations (under aerated and non-aerated conditions) on Cu-activated pyrite hydrophobised by xanthate was examined using flotation, spectroscopic and solution analyses, at pH 10. The results showed that DETA affects the flotation behaviour and surface chemistry of pyrite. However, high dosages are required. The depression action of DETA on Cu-activated pyrite was attributed to both the removal of surface copper to form soluble Cu–DETA complex in solution and competition for Cu sites on the activated pyrite surface. The significant depression of pyrite in the presence of DETA under the aerated condition was due to increased amount of iron oxy–hydroxides (Fe–O/OH), copper oxides and Cu(I)–DETA hydrophilic species. |
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| Keywords: | Flotation Depression Diethylenetriamine Surface analysis Pyrite |
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