Kinetic study of chalcopyrite dissolution with iron(III) chloride in methanesulfonic acid
MetadataShow full item record
© 2018 The suitability of methanesulfonic acid as a copper lixiviant with ferric chloride as an oxidant was studied by analysing the leaching kinetics and by characterising solid residues from leach tests on a chalcopyrite-rich ore sample. The effects of temperature, initial acidity, ferric-ion concentration and particle size were determined. The leach kinetics were dependent on the temperature and particle size, whereas the acid and ferric concentrations had a minimal impact on the leaching rate within the ranges studied. Although a sulfur layer formed on the solid residue, the reaction mechanism could be modeled with the shrinking-core model with surface chemical-reaction control, which implies that lixiviant flow through the sulfur layer did not control the reaction rate. The apparent activation energy was 101 kJ mol-1as calculated by the Arrhenius and 'time-to-a-given-fraction' methods. The activation parameters of the reaction were an enthalpy (?H++) of 99.4 kJ mol-1, and an entropy (?S++) of -197 J mol-1K-1as calculated by using transition state theory and the Eyring equation.
Showing items related by title, author, creator and subject.
McGinnity, Justin (2001)Studies were conducted into the mechanism and kinetics of the dissolution of synthetic zinc sulfide and zinc concentrate in aqueous solutions containing sulfur dioxide.Experiments at ambient temperature established that ...
Zahir, Aishath Zehereen (2008)E-glass has been widely used as a reinforcing material for years, especially as a plastic reinforcer in the production of GRP (Glass Reinforced Plastic). Failure of GRP materials under stress came in to the picture quite ...
Leaching Characteristics of Organic and Inorganic Matter from Biomass by Water: Differences between Batch and Semi-continuous OperationsLiaw, Sui Boon; Wu, Hongwei (2013)Over 30% and ~2% (on a carbon basis) organic matter can be leached from mallee leaf and wood by water, respectively, producing acidic leachates containing organic acids. As a result, there are significant differences in ...