Extraction of Ag(I) with tri-isobutyl phosphine sulphide from sodium chloride media
Keywords:Solvent extraction, Ag(I), Sodium chloride solutions, Tri-isobutyl phosphine sulphide
The solvent extraction of Ag(I) from concentrated sodium chloride solutions by the extractant tri-isobutyl phosphine sulphide is studied. Silver is extracted from this sodium chloride media by means of a solvation reaction, the stoichiometry of the extracted species is related to an extractant: Ag molar relationship of 2. Silver extraction by menas of TIBFS is related to exothermic extraction reactions this behaviour independent both of the aqueous media and the organic diluent. The extraction system is selective with respect to the presence of Cu and Zn in the aqueous phase. Silver is stripped by sodium tiosulphate solutions. Values of log Kext ΔGº and ΔSº a 25 °C for the present extraction system were also given.
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