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South African Journal of Science

versão On-line ISSN 1996-7489

Resumo

VENTER, J.A.  e  VERMAAK, M.K.G.. Dithiocarbonate and trithiocarbonate interactions with pyrite. S. Afr. j. sci. [online]. 2007, vol.103, n.3-4, pp. 164-168. ISSN 1996-7489.

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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