Silver Cementation with Zinc From Residual X Ray Fixer, Experimental and Thermochemical Study

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 t...

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Bibliographic Details
Published inCharacterization of Minerals, Metals, and Materials 2016 pp. 605 - 613
Main Authors Labra, M. Pérez, Pérez, M. Reyes, Serrano, J. A. Romero, Dávila, E. O. Ávila, Hernández, F. R. Barrientos, Thangarasu, Pandiyan
Format Book Chapter
LanguageEnglish
Published Cham Springer International Publishing
Subjects
Cementation
Silver
thermochemical
X. ray fixer
Zn Powder
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Summary: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 di agram 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 90s of reaction, pH 6.0, 318 K and Ag: Zn equal to 1:3. Sil ver 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.
ISBN:9783319486239
3319486233
DOI:10.1007/978-3-319-48210-1_76