Abstract
In the present work, the extraction kinetics of copper using the resulting actual leach solution obtained from the leaching of malachite ore in perchloric acid solutions and the stripping kinetics of copper from the loaded organic phase were examined. The organic phase was prepared by using Acorga M5640 and kerosene. In the extraction process, the effects of the initial pH of aqueous solution, initial concentration of copper, extractant concentration, temperature, and stirring speed on the extraction rate were investigated. In the stripping process, the effects of the concentration of perchloric acid, temperature, stirring speed, and extractant concentration on the stripping rate were examined. It was determined that the extraction rate increased with increasing the initial pH of aqueous solution, stirring speed, extractant concentration and temperature, and with decreasing the initial concentration of copper ions. In the stripping process, it was observed that the stripping rate increased with increasing the concentration of perchloric acid, temperature and stirring speed, and with decreasing the extractant concentration. It was determined that both the solvent extraction and stripping processes could be described by the first order pseudo homogenous reaction model. The activation energy for the extraction and stripping processes was calculated to be 50.04 kJ/mol and 32.42 kJ/mol, respectively.
Highlights
In the leaching step of hydrometallurgical processing of metal-containing ores, the desired metal is transferred from a solid phase to an aqueous phase using a suitable leaching agent
The initial pH of the aqueous phase was changed in the range of 0.5–2.5 while the extractant concentration, organic phase to aqueous phase ratio, stirring speed, copper concentration, temperature, and settling time were kept constant at 4%, 25/25 mL/mL, 400 rpm, 152 mg/L, 25 °C, and 10 min, respectively
The recovery kinetics of copper by the solvent extraction from the aqueous solution obtained from the leaching of malachite ore in perchloric acid solutions was examined
Summary
In the leaching step of hydrometallurgical processing of metal-containing ores, the desired metal is transferred from a solid phase to an aqueous phase using a suitable leaching agent. To examine the effect of the initial concentration of copper in the leach solution on the solvent extraction process, several experiments were carried out at different initial concentrations of copper for various contact time between the aqueous and organic phases.
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