Effect of Oxygen and Micro-Cracking on the Flotation of Low Grade Nickel Sulphide Ore

This study investigated the effect of oxygen and micro-cracking on the flotation of low grade nickel sulphide ore. The ore treated contained serpentine minerals which have a history of being difficult to process efficiently. The use of oxygen as a bubbling gas has been noted to be effective because it increases the pulp potential. The desired effect of micro cracking the ore is that the nickel sulphide minerals will become activated and this activation will render these minerals more susceptible to react with potassium amyl xanthate collectors, resulting in a higher recovery of nickel and hinder the recovery of other undesired minerals contained in the ore. Higher nickel recoveries were obtained when pure oxygen was used as a bubbling gas rather than the conventional air. Microwave cracking favored the recovery of nickel.

Authors:

• Edison Muzenda
• Ayo S Afolabi

Keywords:

• Flotation
• Conventional air
• Oven micro-cracking
• Recovery.

References:

[1] A. N. Kerr, "Effect of pulp rheology on flotation: the nickel sulfide ore
with asbestos gangue system," in: I. Kilickaplan, 2007.
[2] H. Kuopanportti, E. Pollanen and T. Suorsa, "Effect of oxygen on
kinetics of conditioning in sulphide ore flotation," Minerals
Engineering, vol. 10, series. I1, pp.1193-1205, pp. 1997.
[3] D. Weston, "Flotation of copper-nickel sulfide ores," United States
Patents, 1976.
[4] G. Barbery, A. W. Fletcher, C. Chem, and L.L. Sirois, "Exploitation of
complex sulphide deposits: a review of processing options from ore to
metals," in Complex Sulphide Ores, M. J Jones, Ed., The Institution of
Mining and Metallurgy, London, pp. 135-150.
[5] G. D. Senoir, and A. S. Thomas, "Development and implementation of a
new flow sheet for the flotation of a low grade nickel ore," International
Journal of Minerals Processing, vol. isuue. 1, pp. 49-61, 2005.
[6] S. W. Kingman, "Recent developments in microwave processing of
minerals," International Materials Rev. vol. 51, pp. 1-12, 2006.
[7] M. Al-Harahsheh, and S. W. Kingman, "Microwave-assisted leaching
ÔÇö a review," Hydrometallurgy, vol. 73, issue 3-4, pp. 189-2003, June
2004.
[8] P. A. Olubambi, "Influence of microwave pretreatment on the
bioleaching behaviour of low-grade complex sulphide ores,"
Hydrometallurgy, vol. 95, issue 1-2, pp. 159-165, February 2009.
[9] T. Rosenqvist, "Principles of Extractive Metallurgy," McGraw-Hill
Kogakusha, Ltd. pp.209, 1974.
[10] J. Wiese, P. Harris, D. Bradshaw, "The response of sulphide and gangue
minerals in selected Merensky ores to increased depressant dosages,"
Minerals Engineering, vol. 20, issue 10, pp. 986-995, 2007.
[11] K. Heiskanen, V. Kirjavainen and N. Schreithofer, "Effect of some
process variables on flotability of sulfide nickel ores," International
Journal of Mineral Processing, vol. 65, issue 2, pp. 59-72, 2002.