Silver cementation with zinc from residual X ray fixers (XRF) was studied. The chemical analysis of XRF showed 5.16 g/l (Ag), 0.56 g/l (Al), 5.24 g/L (K), 7.02 g/L (Na) and 172.56 g/L (S). The cementation process in terms of solution pH was thermodynamically modeled using FactSage by constructing the potential-pH diagram at 298.15 K. This diagram showed that the cementation process leads to metallic silver together with residual unreacted zinc. The parameters experimentally evaluated were: pH (ranged from 3.0 to 7.0, temperature (ranged from 298.15 to 318.15 K) and the Ag:Zn weight ratio (1:1, 1:2, 1:3, 1:4 and 1:5). The maxim silver cementation (99.99 % Ag) was obtained at 90 s of reaction, pH 6.0, 318 K and Ag:Zn equal to 1:3. Silver cementation increases whit the Ag:Zn weight ratio, pH and temperature increases. The X-Ray and SEM-EDS results showed that the cementation product is formed by Ag and Zn.
CITATION STYLE
Labra, M. P., Pérez, M. R., Serrano, J. A. R., Dávila, E. O. Á., Hernández, F. R. B., & Thangarasu, P. (2016). Silver cementation with zinc from residual X ray fixer, experimental and thermochemical study. In Characterization of Minerals, Metals, and Materials 2016 (pp. 605–613). Springer International Publishing. https://doi.org/10.1007/978-3-319-48210-1_76
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