Abstract
The solvent extraction of gold(I) from aurocyanide solutions by means of various reagents: amines (Primene JMT, Amberlite LA2, Alamine 336), solvation extractants (TBP, Cyanex 921, DMPL) and mixtures of both is reported. Different variables that could affect the systems were evaluated; on the basis of the numerical treatment of experimental data, the stoichiometries of the extracted species (generally represented by HAu(CN) 2·R·L q , R being the amine, L the solvation extractant and q depending either of the amine and/or the solvation reagent) are proposed. The permeation of Au(I) through a supported liquid membrane impregnated with various of the extractants has been investigated. High selectivity in the separation, through supported liquid membrane, of Au(I) against different metal–cyano complexes (Ag(CN) 2 −, Cu(CN) 4 3−, Zn(CN) 4 2−, Fe(CN) 6 3−) is achieved.
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