Thermodynamic Modelling of Iron Solubility in Sulphide Mineral Leaching

Pauliina Nurmi; Lasse Ahonen; Olli H. Tuovinen

doi:10.4028/www.scientific.net/AMR.71-73.441

Paper Titles

Leaching of Ni and Cu from Mine Wastes (Tailings and Slags) Using Acid Solutions and A. Ferrooxidans
p.425

Indirect Bioleaching and ZINCEX^TM Process: A Profitable Marriage to Process Zinc Polymetallic Concentrates
p.429

Bacterial Oxidation of Ferrous Iron and RISCs at Low Temperatures: Their Effect on Acid Mine Drainage and Bioleaching of Sulphide Minerals
p.433

Thermodynamic Simulation of Sulphide Mineral Leaching
p.437

Thermodynamic Modelling of Iron Solubility in Sulphide Mineral Leaching
p.441

Thermodynamic Modelling of Phosphate and Chloride Effects on Solid and Solution Phase Ferric Iron Speciation
p.445

Adhesion of Acidithiobacillus Caldus and Leptospirillum Ferriphilum on Pyrite and their Effect on Surface Properties of Sulfide Minerals
p.449

Precipitation of Iron Oxyhydroxides and Basic Sulphates from Bioleach Liquors Generated by Thermophilic Micro-Organisms
p.453

Bioleaching of Uranium Ore by a Novel Acidophilic Consortium at Different Acid Concentrations
p.457

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 71-73Thermodynamic Modelling of Iron Solubility in...

Thermodynamic Modelling of Iron Solubility in Sulphide Mineral Leaching

Abstract:

In this study the effects of pH and temperature on iron solubility were predicted using the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. The modelling results demonstrated that the solubility of secondary solid phases formed under acid bioleaching conditions decreases with increasing temperature and also with increasing pH. Modelling calculations showed that bioleaching solutions are typically supersaturated with respect to K-, Na-, NH4-, and H3O-jarosites and the precipitates are typically solid solutions containing their mixtures. Jarosite solubility modelling results were also compared with a data set from jarosite synthesis experiments. Model-derived temperature dependence of hydronium-jarosite correlated very well with the actual experimental data.