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

descriptionPublicationkeyboard_double_arrow_right Article 01 May 1997 English Publisher:Elsevier BVJournal:Hydrometallurgy, volume 45, pages 199-209 (issn: 0304-386X,

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Authors: Barroso, M. A; López Gómez, Félix Antonio; Sastre Requena, Ana María; Alguacil, Francisco José;

doi: 10.1016/s0304-386x(96)00080-1

handle: 10261/38423

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

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Abstract

The extraction of gold(III) from hydrochloric acid solutions by means of the phosphine oxide Cyanex 925 was studied as a function of different variables: equilibration time, temperature, organic diluent, and concentration of gold, Cyanex 925, HCl, etc.; the system is selective with respect to the extraction of a number of metals. Gold(III) equilibrium loading isotherms were also obtained at 20°C. Experimental data were treated numerically showing that gold extraction can be explained assuming the formation of a complex with the general stoichiometry: HAuCl4L2, where L represents the extractant. For the extraction reaction log Kexto = 8.1. The stripping of gold from loaded organic phases can be achieved with water. Data on the extraction of HCl by Cyanex 925 are also presented.

The CSIC (Spain) are acknowledged for supporting this work

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Keywords

Gold (III) extraction, Cyanex 925, Aqueous hydrochloric

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