The role of oxygen in cyanide leaching of gold ore

Abstract This paper is a brief overview of the role of oxygen in cyanide leaching of gold feeds (e.g. ore, concentrate). As the majority of gold occurs in the elemental state (Au°), its oxidation is of vital importance for dissolution in the cyanide lixiviant. The cyanida-tion at high pH is favourable for the oxidation of Au° with a mild oxidant such as air or oxygen. Beside oxidation of gold, deleterious effects of soluble sulphides, arsenates, antimonates on cyanidation of gold can be alleviated by preaerating the leach slurry with air or oxygen (i.e. preaeration process).
If gold is refractory due to its occlusion in sulphides, silicates, tellurides, etc. then gold liberation is possible by roasting in the presence of oxygen or by leaching under oxygen pressure. The data in the recent literature indicate that reactive oxygen supplied by Hf)2, Na2O2, CaO2 or O3 during cyanidation can accelerate considerably gold oxidation-cyanidation and yield high gold recovery in much shorter leach time. The information compiled in this review leads to the conclusion that oxygen plays a vital role in the dissolution of gold in cyanide lixiviant.
Keywords: Gold, Cyanide leaching, Chemistry of cyanidation, Oxidation, Preaeration, Active oxygen.
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Publication: CIM Bulletin
Author(s): Lynne Bowen
Issue: 963
Volume: 85
Year: 1992
Text
Publication: CIM Bulletin
Author(s): Andrew Cormier
Issue: 963
Volume: 85
Year: 1992
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Summary: At Teck-Corona Operating Corporation's David Bell Mine, a successful -water quality management strategy has been established. This resulted from the development and application of process technology, allowing year round discharge of an effluent exceeding the chemical and biological standards set by the Ministry of Environment. This strategy aims at minimizing contaminant levels of effluents through optimization of reagent selection and reduction of effluent volumes through maximizing reclaim...
Publication: CIM Bulletin
Author(s): Klaus Meyer
Keywords: Water quality, Effluent treatment.
Issue: 963
Volume: 85
Year: 1992
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Summary: Australia's prosperity relies significantly on income generated from exports of resources and agricultural products. In 1989-1990, coal was Australia's most valuable export commodity, contributing A$5.7 billion or 14% of all export income.
The abundance and quality of its coal resources and the proximity of Australia to the rapidly developing economies of Southeast Asia were significant factors that encouraged export-oriented growth and investment and will continue to do so. On the other...
Publication: CIM Bulletin
Author(s): Trevor McGiddy
Keywords: Coal industry, Australian coal industry.
Issue: 963
Volume: 85
Year: 1992
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Summary: A scientific testing program, sponsored by the Mining Industry Research Organization of Canada (MIROC), was undertaken on the surface and underground facilities of Inco's Crean Hill Mine to investigate the effectiveness of using dry drilling with a dust control system.
The surface test work consisted of the monitoring of advance rates and bit life while a series of 165 mm holes, wet and dry, were drilled at both mine air (0.69 MPa) and high pressure air (1.72 MPa). The results, based on...
Publication: CIM Bulletin
Author(s): E.M. De Souza
Keywords: Dry drilling, Drilling, Underground mining, Dust control.
Issue: 963
Volume: 85
Year: 1992
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