Study of the extraction of gold(III) in aqueous hydrochloric acid media by the phosphine oxide Cyanex 925

摘要: Abstract The extraction of gold(III) from hydrochloric acid solutions by means the phosphine oxide Cyanex 925 was studied as a function different variables: equilibration time, temperature, organic diluent, and concentration gold, 925, HCl, etc.; system is selective with respect to number metals. Gold(III) equilibrium loading isotherms were also obtained at 20°C. Experimental data treated numerically showing that gold can be explained assuming formation complex general stoichiometry: HAuCl 4 L 2 , where represents extractant. For reaction log K ext o = 8.1. stripping loaded phases achieved water. Data on HCl are presented.