Solvent extraction of polyvanadates from sulphate solutions by PRIMENE 81R. Its application to the recovery of vanadium from spent sulphuric acid catalysts leaching solutions
Lj. Lozano et D. Juan, Solvent extraction of polyvanadates from sulphate solutions by PRIMENE 81R. Its application to the recovery of vanadium from spent sulphuric acid catalysts leaching solutions, SOLVENT EXT, 19(4), 2001, pp. 659-676
Recovery of vanadium from a spent catlaysts leaching process has been studi
ed using primary amine PRIMENE 81R, resulting in an industrial multistage p
rocess for the treatment of these effluents. An extraction mechanism for V(
V) is proposed for this amine in acidic media, verifying the influence of p
H on the process. Adequate ranges for the variables: O/A ratio, organic pha
se composition, pH, stirring speed and phase separation speed were fixed an
d simulated in industrial conditions. Vanadium is finally recovered by mean
s of precipitation as ammonium metavanadate and later calcination to obtain
vanadium pentoxide of commercial grade.