Abstract
In this research, the dissolution behaviour and leaching kinetics of Sarcheshmeh chalcopyrite concentrate was investigated in oxidative ammonia/ammonium carbonate solution. Temperature, concentration of ammonia and ammonium carbonate, agitation speed, solid to liquid ratio, oxygen flow rate, pH and particle size were chosen as parameters in the experiments. About 70% of copper was effectively recovered at temperature 60°C; ammonia/ammonium carbonate concentrations: 5M NH3+0.3M (NH4)2CO3; agitation speed: 1000rpm; solid to liquid ratio: 1:20g/mL; oxygen flow rate: 1L/min; leaching times: 240min and 80% passing size finer than 42μm. Also kinetic results and morphology and elemental composition of residue at the most suitable conditions show that, the leaching process is controlled by the diffusion of reagents or products from iron oxide passive layer formed on chalcopyrite surface. Activation energy was determined to be 25kJ/mol.
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