Gold extraction equilibrium in the system Cyanex 921-HClAu(III)
作者： S. Martínez , A. Sastre , F.J. Alguacil
DOI: 10.1016/S0304-386X(97)00014-5
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摘要: Abstract The partition of gold from hydrochloric acid solutions by the phosphine oxide Cyanex 921 has been studied. extraction system is exothermic (ΔH° = −44.6 kJ/mol), being influenced several variables. Maximum obtained in HCl concentration range 5–7 M. Experimental data were analyzed numerically using program LETAGROPDISTR. results showed that can be explained assuming formation species HAUCl4L (log K° 1.99) and HAuCl4L2 6.68) organic phase, where L represents extractant. From experimental interaction coefficients for (AuCl4−1, H+) estimated. Gold stripping achieved effectively with water reaction endothermic (ΔH°= 16.9 kJ/mol). Results on are also presented.
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