Microscopic mechanism in solvent extraction of Au（CN）2^- by cationic surfactant

A new solvent extraction system of Au(Ⅰ)by surfactant CTMAB-TBP-inert diluent-Au(CN)2--H2O was investigated and established.The infrared spectra and the conductivities of loaded organic phases containing Au(Ⅰ)were recorded stage by stage.It was reported that in the presence of salting-out agents the pencent extraction of Au(Ⅰ)decreased,and the conversion of emulsions from W/O to O/W happened in the extraction processed.The results demonstrate that the extraction process of Au(CN)2-is carried out by two steps.First,an associated molecule between CTMA+ and TBP,as (C16 H33) (CH3)3 N+·H2O·O= P(OC4 H9)3,is formed by dint of water molecule,then it will pull Au(CN)2-into the organic phase based on the electro-neutrality.