Journal article
Review of rate constants for thiosulphate leaching of gold from ores, concentrates and flat surfaces: Effect of host minerals and pH (Review)
Minerals Engineering, Vol.20(1), pp.1-15
01/2007
Abstract
A review of literature data for different types of sulphide concentrates and gold ores has been carried out to examine the impact of host minerals and pH upon gold leaching. Analysis of initial rate data over the first 30-60 min of gold leaching from sulphide concentrates or silicate ores over a range of ammonia, thiosulphate, and copper(II) concentrations, pH (9-10.5) and temperatures up to 70 °C shows the applicability of a shrinking sphere kinetic model with an apparent rate constant of the order kss = 10-6-10-3 s-1. The dependence of apparent rate constant on pH and initial concentrations of copper(II) and thiosulphate is used to determine a rate constant kAu(ρr)-1 of the order 1.0 × 10-4-7.4 × 10-4 s-1 for the leaching of gold over the temperature range 25-50 °C (ρ = molar density of gold, r = particle radius). These values are in reasonable agreement with rate constants based on electrochemical and chemical dissolution of flat gold surfaces: kAu = 1.7 × 10-4-4.2 × 10-4 mol m-2 s-1 over the temperature range 25-30 °C. The discrepancies reflect differences in surface roughness, particle size and the effect of host minerals.
Details
- Title
- Review of rate constants for thiosulphate leaching of gold from ores, concentrates and flat surfaces: Effect of host minerals and pH (Review)
- Authors/Creators
- G. Senanayake (Author/Creator) - Murdoch University
- Publication Details
- Minerals Engineering, Vol.20(1), pp.1-15
- Publisher
- Elsevier BV
- Identifiers
- 991005544702307891
- Copyright
- © 2006 Elsevier Ltd. All rights reserved.
- Murdoch Affiliation
- Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 7 Engineering & Materials Science
- 7.229 Mineral & Metal Processing
- 7.229.774 Bioleaching
- Web Of Science research areas
- Engineering, Chemical
- Mineralogy
- Mining & Mineral Processing
- ESI research areas
- Geosciences