Abstract
The rate of vanadium (IV) extraction from sulphuric acid medium by di(2-ethylhexy) phosphoric acid in n-hexane diluent was investigated. The liquid mixture was stirred at a speed at which the influence of diffusion on kinetics was believed to be a minimum. The overall rate of mass transfer was found to be first order in aqueous vanadium concentration, inverse first order in aqueous hydrogen ion concentration and a half order with respect to the concentration of the extractant in the organic phase. The rate constant at 28°C is 2.8×10 −3 mol 1 2 s −1 and the activation energy is 64 kJ mol −1. A mechanism is proposed for the extraction kinetics.
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