Abstract
A solvent extraction process using Primene JMT (Rohm & Haas Company) as the extractant was investigated in this study in order to remove iron(III) (3-4 g/L) from an aluminum sulfate solution. The iron-loaded amine solution was regenerated by first stripping with 3.0 M NaOH solution, followed by neutralization with 1.5 M H 2 SO 4 solution. To improved its extractability of iron, the amine solution was contacted again with a weak NaOH (0.275 M solution to adjust its pH value to between 6 and 7. A subsequent continuous experiment showed that the iron(III) concentration in the acid solution can be decreased from 3.18 to 0.0124 g/L, i.e. a 99.6% reduction, in a four stage counter-current extraction operation using the proposed regeneration procedure. © 1986.