9 Slag Cleaning (Co)

9 Slag Cleaning (Co) - Recovery of cobalt from slag in a DC...

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1 Recovery of cobalt from slag in a DC arc furnace at Chambishi, Zambia A study by R.T. Jones et al. Published in 2002 in the Journal of the SA Inst. Min. Met. Acknowledgement: Anglovaal Mining Ltd Cobalt • Persians used Co to colour glass in 2250 BC • Metallic cobalt isolated in 1735 by Brandt • Co recognised as an element in 1780 • Current world production over 30 kt/a • Gecamines (DR Congo) peak production of 14.5 kt/a in 1986 Recovery of Co from slags • Process using a DC arc furnace being developed at Mintek since 1988 • Recoveries of 80% for Co (98% for Ni) Pilot-scale testwork Nickel-copper converter slag • 100 kVA and 200 kVA tests • Co: 0.45% Cu: 3% Ni: 3.5% 7% coal addition to slag • 7% coal addition to slag • 81% Co recovery • 97% Ni recovery • 78% Cu recovery • 80% of Fe remains in slag Nickel-copper converter slag 0.3 0.4 0.5 0.6 0.8 by mass % by mass 0 0.1 0.2 0 2 04 06 08 0 0 0.2 0.4 Fe in alloy, % by mass Co in slag, % Ni in slag,
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2 Copper reverberatory furnace slag – 200 kVA kinetics 0.3 0.4 0.5 0.6 g, % by mass 0 0.1 0.2 0 20 40 60 80 100 120 Time, min Co in sla • 4% coal addition • 1-2 hour residence time gave 77-91% Co recovery Chambishi, Zambia • Avmin purchased Nkana reverb slag dump, and Chambishi Roast Leach Electrowinning plant in 1998 for US $50m Chambishi upgrade • July 1999: announcement of US $100m smelter to expand Chambishi production by 4 kt/a of Co and 3.5 kt/a of Cu Contract engineering • Kvaerner – overall management • Dowding Reynard & Associates – material handling & feed preparation
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This note was uploaded on 05/13/2011 for the course METALLURGY 1133 at Murdoch.

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9 Slag Cleaning (Co) - Recovery of cobalt from slag in a DC...

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