The equilibrium of extraction of V(IV) in the V(IV)- SO 4 2- (H + , Na + )-Cyanex 301 (HA)-kerosene system has been studied. Significant extraction occurs above pH 1 within 10 min. C D (extraction ratio at constant pH ( e q ) and [HA] ( o , e q ) ) value is slightly decreased with increasing [V(IV)] ( i n i ) . C D is found to be directly proportional to [H + ] - n (n ≤ 2), [HA] 2 and (1+1.58 [SO 4 2- ]) . The process is endothermic ( D H = 16 kJ/mol). Apparent K e x values at 303 K are 10 - 1.419 and 10 - 0.94 in 0.10 and 1.50 mol/L SO 4 2- medium, respectively. The loading capacity is calculated to be7.87 gV(IV) per100 g Cyanex 301. Kerosene appears as the best diluent. Stripping to the extents of 100%, 94% and 97.7% are possible in single stage by 1 mol/L H 2 SO 4 , HCl and HNO 3 , respectively. Separations of V(IV) from Cu(II) (at pH 0), Zn(II) (at pH 0.5) and Fe(III) (at pH 1.0) by Cyanex 301 are possible.
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