CIM Journal, Vol. 8, No. 1

CIM Journal, Vol. 8, No. 1, 2017
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Summary: To optimize gold recovery in complex leach-to-electrowinning processes, Gekko Systems developed the Gekko resin exchange column (G-REX) as an intermediate step, using a highly gold-selective resin to isolate contaminant metals. The AuRIX®100 resin produced by Purolite is licensed exclusively to Gekko, with the G-REX column designed specifically for this resin. Operational experience has been gained at the Castlemaine Goldfields Ballarat gold mine. In near-continuous operation since 2008, the...
Publication: CIM Journal
Author(s): P. Richards, A. Lewis-Gray, and N. Katsikaros; M. Davies
Keywords: Absorption, AuRIX®, Carbon, Column, Concentrate, Flotation, Gold, Gravity, InLine leach reactor (ILR), Resin, Stripping
Issue: 1
Volume: 8
Year: 2017
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Summary: Discrete-element method (DEM) modelling is a powerful tool for studying particulate systems within the mineral processing industry. DEM simulations were conducted to investigate the power draw, load behaviour, and impact energy profile of an experimental ball mill under different milling conditions. The variables considered were mill rotational speed (percent critical speed), ball size, and lifter face angle. The simulation results indicated that the grinding efficiency would be enhanced by...
Publication: CIM Journal
Author(s): M. B. Kime
Keywords: Ball milling, Discrete element method (DEM), Impact energy, Load behaviour, Power draw
Issue: 1
Volume: 8
Year: 2017
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Summary: The Voisey’s Bay mill processes a high-grade pentlandite and chalcopyrite ore in a largely pyrrhotite/troilite matrix. From 1994 to 1997, circuit development focused on making a 14% nickel concentrate. When flowsheet development resumed in 2001, the target grade was raised to 20% ni. initially triethylene tetramine and sulfite pyrrhotite depressants were used in a lime circuit, but by recycling process water and the contained thiosalts, the required nickel grade was made without depressants....
Publication: CIM Journal
Author(s): P. F. Wells, P. Langlois, J. J. Barrett, J. Holmes, M. Xu, and G. Labonté
Keywords: Mini pilot plant, Nickel ore milling, Process water recycle, Pyrrhotite depression, Start-up, Sulfite, Triethylene tetramine, Voisey’s Bay mill
Issue: 1
Volume: 8
Year: 2017
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Summary: The LaRonde mill was commissioned in 1988 and began treating ore from the Penna shaft in 2000. The mill has been expanded to accommodate 7,500 t/day, but ramped down to 6,000 t/day since the deep extension began. The process recovers gold, silver, and base metals. In 2008, the Goldex plant began trucking gold-pyrite concentrate to a treatment plant feeding pulp to the LaRonde mill, increasing gold output by 40,000 oz. In 2009, the high-grade Lapa ore processing facilities were annexed to the...
Publication: CIM Journal
Author(s): C. Bolduc and J. Cayouette, P. Blatter
Keywords: Collector, Frother, Goldex, Lapa, Thiocyanate
Issue: 1
Volume: 8
Year: 2017
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Summary: Hydrocyclones are used in various industrial applications, including mineral processing and tailings management, to separate or classify solid particles and/or liquid droplets from multiphase feed. The fluid flow in a hydrocyclone (used in mineral processing) was investigated numerically and experimentally using particle-image velocimetry (PIV) and refractive index matching techniques. Two turbulence models were used in the calculations: the k–ω model and the Reynolds stress model. Particle...
Publication: CIM Journal
Author(s): E. Kucukal and J. R. Kadambi, J. Furlan and R. Visintainer
Keywords: Computational fluid dynamics (CFD), Hydrocyclone, k–ω model, Particle image velocimetry (PIV), Refractive index (RI), Reynolds stress model (RSM)
Issue: 1
Volume: 8
Year: 2017
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Summary: Maximizing the value of each tonne of processed ore is the goal for all operations. Cyanidation processing of gold-copper ores has been challenging since its first use in 1889. The current practice treats a bleed or the total flow of mill solution to recover copper as copper sulfide (by sulfidization, acidification, recycling, and thickening), or to recover the cyanide (by acidification-volatilizationneutralization). The process presented uses the adsorption of copper cyanide by carbon and...
Publication: CIM Journal
Author(s): S. N. Dixon
Keywords: Activated carbon, Copper cyanide, Elution
Issue: 1
Volume: 8
Year: 2017
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Summary: A set of experimental batch leaching tests studied the effect of pH, time, temperature, and stirring speed on the relative Cu, Co, Ni, and Fe leaching yields of an oxidized copper-cobalt ore sample in an aqueous hydrochloric acid solution. The results were statistically analyzed and modelled using the structural equation modelling method. Models showed that Cu, Co, and Ni leaching yields were strong functions of the leaching time and leaching temperature, whereas the Fe leaching yield...
Publication: CIM Journal
Author(s): M. B. Kime
Keywords: Factor analysis, Leaching optimization, Multiple regression, Oxidized copper-cobalt ore, Path analysis, SPSS® Amos, SPSS statistics, Structural equation modelling (SEM)
Issue: 1
Volume: 8
Year: 2017
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