Solvent Extraction of KAu(CN)2 Using Quaternary Ammonium Salt
季铵盐体系金的萃取与反萃

Solvent extraction and stripping of KAu(CN)2 from alkaline solution with cetyltrimethylammonium bromide (CTAB)/hexanol/heptane using 198Au tracer was investigated. Various parameters, such as Au(I) concentration in aqueous phase, concentrations of halogen ions, NH4SCH and thiodiethylene glycol in stripping solution as well as the relationship between water and Au(I) concentrations in organic phase, in the forward and backward extraction of Au(I) were studied. The results show that water content decreases significantly with the increase of Au(I) concentration in the organic phase. About 98% Au(I) extracted into organic phase can be back extracted with pure thiodiethylene glycol as the stripping agent. Most of Au(I) (~93%) in the organic phase can be stripped into the aqueous phase with high concentration of NH4SCN(>3.0 mol/L) or KI (>2.0 mol/L).