Electrochemical investigation of copper–DTPI interactions
The electrochemical behavior of copper in the absence and presence of a dithiophosphinate type collector, sodium diisobuthyldithiophosphinate (NaDTPI), was determined to investigate the interactions between a copper surface and NaDTPI as a function of pulp potential (Eh) and pH. The electrochemical studies were performed by Cyclic Voltammetry (CV) in the −355 to +1550 mV (SHE) potential range and at different pHs from slightly acidic to strongly alkaline conditions. The electrochemical studies were carried out for copper and DTPI alone as well as with DTPI added copper system. DTPI addition had considerable effects on the electrochemical behavior of copper. CuDTPI formation was the main reaction at all pHs through a mixed mechanism and oxidation of the copper surface was followed by a chemical reaction between copper and DTPI ions. Formation of a cupric metal-collector complex, Cu(DTPI)2, was observed only in acidic conditions in the form of an unstable surface compound.
Keywordsadsorption copper cyclic voltammetry pH pulp potential redox reactions sodium dithiophosphinate
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- 1.J. Pang and S. Chander, Miner. Metall. Process. August (1990) 149Google Scholar
- 5.Persson I. (1993) J. Coord. Chem. 32–4:261Google Scholar
- 6.J. Leppinen, FTIR and Flotation Investigation of Adsorption of Diethyl Dithiophosphate on Sulfide Minerals, Research Reports 726 (Technical Research Centre of Finland, Finland, 1991)Google Scholar
- 8.Cytec, Mining Chemicals Handbook (Cytec Industries Inc, 2002) 293 ppGoogle Scholar
- 11.Finkelstein N.P. (1976) In: Fuerstenau M.C. (eds) A.M. Gaudin Memorial Volume, Flotation, 1. American Institute of Mining, Metallurgical and Petroleum Engineers, New York, pp 414–451Google Scholar
- 13.B.V. Stewart and N.P. Finkelstein, A Preliminary Investigation of the Flotation of Copper-Activated Sphalerite without the Use of Collectors, Report No. 1587 (S.A. National Institute for Metallurgy, 1973)Google Scholar
- 14.Wang X., Forssberg E., Bolin N.J. (1989) Miner. Process. Ext. Met. Rev. 4:139Google Scholar
- 19.Garrels R.M., Christ C.L. (1965) Solutions, Minerals and Equilibria. Harper & Row Publishers, New York, 450 ppGoogle Scholar