The Effect of the Presence of Pentlandite in the Flotation of Moncheite PtPd(BiTe)2
This study examines the surface alteration and flotation behaviour of synthetic moncheite,PtPd(BiTe)2, in the presence of pentlandite. The telluride minerals contribute around 20%～30% and up to 45% of the PGM present in the Platreef ore and are considered to be slow floating as there is evidence of these minerals reporting to the tailings. It was proposed that oxidation products from other minerals and grinding media would affect the mineral surface composition and floatability thereby causing inadvertent depression of moncheite due to precipitating ions.ToF-SIMS analyses (time of flight secondary ion mass spectrometry) was used to characterise the mineral surface as well as the extent of surface alteration. Microflotation was used to determine the hydrophobicity of the synthetic minerals.Conditioning of moncheite in the presence of penflandite reduced the flotation response of the + 38 -106μm size fraction from ＞ 99% to 56%. This was due to pentlandite dissolution products (iron and nickel hydroxy species) which formed overlayers on the mineral surfaces thereby inhibiting the adsorption of collector. In addition, further grinding of these samples, with and without pentlandite conditioning showed a negative effect on recovery due to the fineness of the particle size distribution and there was no advantage gained from any possible exposure of fresh sites in the sample.
Surface passivation Microflotation Moncheite Pentlandite ToF-SIMS SIBX
N. J. Shackleton V. Malysiak C. T. OConnor
Anglo Research, Crown Mines, South Africa Mineral Processing Research Unit, Department of Chemical Engineering,University of Cape Town, Rondeb
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
908-913
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）