Solvent extraction of gold (III) by the chloride salt of the tertiary amine Hostarex A327. Estimation of the interaction coefficient between AuCl4- and H+

Authors
Martinez, S Sastre, AM Alguacil, FJ
Citation
S. Martinez et al., Solvent extraction of gold (III) by the chloride salt of the tertiary amine Hostarex A327. Estimation of the interaction coefficient between AuCl4- and H+, HYDROMETALL, 52(1), 1999, pp. 63-70
Citations number
20
Categorie Soggetti
Metallurgy
Journal title
HYDROMETALLURGY
ISSN journal
0304386X → ACNP
Volume
52
Issue
1
Year of publication
1999
Pages
63 - 70
Database
ISI
SICI code
0304-386X(199904)52:1<63:SEOG(B>2.0.ZU;2-X
Abstract
The equilibrium distribution of gold (III) between hydrochloric acid and th e chloride salt of the amine Hostarex A327 in n-decane was studied. The ext raction reaction is exothemic (Delta H degrees = -22.9 kJ/mol). Gold (III) is extracted by the reaction: R3NH+Clorg- + AuCl4 beta q- reversible arrow R3NH+AuCl4org- + Cl-aq(-) The extraction equilibrium constant depends on the ionic strength. From thi s dependency it was estimated that the interaction coefficient (AuCl4-,H+) is 0.26. (C) 1999 Elsevier Science B.V. All rights reserved.