P507+N235双溶剂萃取除铁生产实践

介绍了在硫酸介质中使用P507+N235双溶剂萃取体系萃取除铁的工艺应用。通过生产实践发现,铁以三价态被萃取,有机相由15%P507+5%N235+80%260#稀释剂组成,相比2∶1,铁萃取率达到98%以上,在反萃剂为250g/L稀硫酸溶液,相比4∶1的条件下反萃,铁反萃率达到98%以上,反萃液经均相渗析膜分离回收酸,渗析残液通过控制pH,可采用铁矾法、中和除铁和砷酸铁等工艺除铁,铁脱除率均可达到90%以上。

Production Practice on Removal of Fe3+ by P507+N235 Double Solvent Extraction

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%.