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South African Journal of Science

versão On-line ISSN 1996-7489
versão impressa ISSN 0038-2353

S. Afr. j. sci. vol.103 no.3-4 Pretoria Mar./Abr. 2007




Dithiocarbonate and trithiocarbonate interactions with pyrite



J.A. Venter; M.K.G. Vermaak

Department of Materials Science and Metallurgical Engineering, University of Pretoria, Pretoria 0002, South Africa




Dithiocarbonate (xanthate) collectors have been the workhorse of the sulphide flotation industry for more than 80 years. More recently, some flotation plants have started to use a new collector, trithio-carbonate (TTC). Extensive research has been conducted on the interaction of different substrates with xanthates, which adsorb electrochemically and are present as a chemisorbed xanthate, metal xanthate or dixanthogen. The work reported here is the first detailed, fundamental evaluation of a long-chain trithiocarbonate collector for sulphide minerals. The results show that this collector-unlike the widely used xanthate collector-has a strong non-electrochemical collection action in addition to an electrochemical one. The non-electrochemical action opens up significant possibilities of changing mill conditions (specifically regarding the propensity of sulphide minerals to oxidize), to obtain better sulphide recovery.



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1. Woods R. (1996). Chemisorption of thiols on metals and metal sulfides. Mod. Aspects Electrochem. 29, 401-453.         [ Links ]

2. Finkelstein N.P. and Poling G.W. (1977). The role of dithiolates in the flotation of sulphide minerals. Mineral Sci. Engng 9(4), 177-197.         [ Links ]

3. Woods R. (1971). The oxidation of ethyl xanthate on platinum, gold, copper and galena electrodes. Relation to the mechanism of mineral flotation. J. Phys. Chem. 75(3), 354-362.         [ Links ]

4. Woods R., Hope G.A. and Brown G.M. (1998). Spectroelectrochemical investigations of the interaction of ethyl xanthate with copper, silver and gold: III. SERS of xanthate adsorbed on gold surfaces. Colloids and Surfaces A: Physiochem. Engng Aspects 137, 339-344.         [ Links ]

5. Breytenbach W., M.K.G. Vermaak and Davidtz J.C. (2003). Synergistic effects among dithiocarbonates (DTC), dithiophosphate (DTP) and trithiocarbonates (TTC) in the flotation of Merensky ores. J. S. Afr. Inst. Min. Metal. 103, 667-670.         [ Links ]

6. Du Plessis R., Miller J.D. and Davidtz J.C. (2000). Preliminary examination of electrochemical and spectroscopic features of trithiocarbonate collectors for sulfide mineral flotation. Trans. Nonferrous Met. Soc. China 10, 12-18.         [ Links ]

7. Du Plessis R., Miller J.D. and Davidtz J.C. (2002). The development of trithiocarbonate collectors for precious metals recovery by sulphide mineral flotation. In Proc. 26th International Precious Metals Conference, Miami.         [ Links ]

8. Drake J.E. and Yang J. (1994). Synthesis and spectroscopic characterization of S-ethyl, S-isopropyl, S-n-propyl and S-n-butyl trithiocarbonate (trixanthate) derivatives of trimethyl- and triphenylgermane and diphenyldigermane. Crystal structure of Ph2Ge[S2CS(i-Pr)]2. Inorg. Chem. 33, 854-860.         [ Links ]

9. Vermaak M.K.G., Pistorius P.C. and Venter J.A. (2005). Electrochemical and Raman spectroscopic studies of the interaction of ethyl xanthate with Pd-Bi-Te. Minerals Engng 18, 575-584.         [ Links ]

10. Gardner J.R. and Woods R. (1977). An electrochemical investigation of contact angle and of flotation in the presence of alkylxanthates. II Galena and pyrite surfaces. Aust. J. Chem. 27, 981-991.         [ Links ]

11. Woods R. (1976). Electrochemistry of sulphide flotation. In Flotation: A.M. Gaudin Memorial Volume, vol. 1, ed. M.C. Feurstenau, pp. 298-333. Port City Press Inc., Baltimore.         [ Links ]

12. Groot D.R., Harkema S.H.M. and Vermaak M.K.G. (2005). The application of cyclic voltammetry coupled with surface plasmon resonance measurements to thiol-collector interactions with gold surfaces. J. S. Afr. Inst. Min. Metal. 105, 645-652.         [ Links ]

13. Wills B.A. (1997). In Mineral Processing Technology, 6th edn., chap. 12, pp. 258-341. Butterworth Heinemann, Oxford.         [ Links ]

14. McGuire, M.M., Jallad, K N., Ben-Amotz, D. and Hamers, R.J. (2001). Chemical mapping of elemental sulfur on pyrite and arsenopyrite surfaces using near-infrared Raman imaging microscopy. Appl. Surf. Sci. 178, 105-115.         [ Links ]

15. Oblonsky L.J. and Devine T.M. (1995). A surface enhanced Raman spectro-scopic study of the passive films formed in borate buffer on iron, nickel, chromium and stainless steel. Corrosion Sci. 37, 17-41.         [ Links ]

16. Kudelski A. (2005). Characterization of thiolate-based mono- and bilayers by vibrational spectroscopy: a review. Vibrational Spectroscopy 39, 200-213.         [ Links ]



Received 1 June
Accepted 30 September 2006.



* Author for correspondence. E-mail:

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