Effect factors of third phase produced by N_(235) extracting Pt system

The formation of the third phase and the influence of different effect factors on Pt extraction in the N235/HCl/Pt solvent extraction system were investigated by determining the distribution of HCl and H2PtCl6 in organic and aqueous phase,as well as determining the conductivity,volume and water content of the third phase.The results show that H2PtCl6 can be extracted efficiently by tertiary amine N235 no matter under the condition of with or without modifier TBP in the organic phase at high or low initial HCl concentration.And the first step extraction rate is more than 99%.The variety of diluent affects the volume,conductivity and water content of the third phase.However,it has no effect on the Pt extraction rate.In addition,in a gradual step extracting Pt system using C12H26 as the diluent,the Pt concentration in organic phase can reach more than 13.21 g/L without the formation of the third phase.While using sulfonated kerosene as the diluent,the Pt concentration in organic phase can reach more than 23.72 g/L without the formation of the third phase.