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%.