Abstract:Application of P507+N235 double solvent extraction system for Fe3+ removal in sulfuric acid medium was introduced. The production practices show that Fe3+ is extracted in trivalent state and extraction rate of iron is 98% above under the conditions of organic phase of 15%P507+5%N235+80%No. 260 diluent and O/A=2/1. Fe3+stripping rate is 98% above in stripping agent of 250 g/L sulfuric acid solution with O/A=4/1. Sulfuric acid is recovered from tripping liquid by homogeneous phase dialysis membrane. By controlling pH value of dialysis residue, iron can be removed by ferroalumen method, neutralization method, and ferric arsenate method, and Fe3+ removal rate is more than 90%.