Abstract

Tourmaline (dravite) from Western Australia was characterized and its surface properties studied by techniques including potentiometric titrations, microelectrophoresis, X-ray diffraction, microprobe analysis, secondary ion mass spectrometry and ion exchange. Results showed that, when suspended in aqueous solution, dravite released lattice ions into solution. The zeta potential of the dravite surface could be manipulated by exchanging ions from the tourmaline lattice with ions of different valency from solution. The significance of these results to tourmaline flotation are discussed with particular reference to selective cassiterite flotation from tourmaline.

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