Characterization of Minerals, Metals, and Materials 2016 2016
DOI: 10.1007/978-3-319-48210-1_76
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Silver Cementation with Zinc From Residual X Ray Fixer, Experimental and Thermochemical Study

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Cited by 3 publications
(6 citation statements)
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“…Metallic zinc powders are commonly used as an electron donor for the recovery of silver from hydrometallurgical streams via traditional, nonpulsed redox replacement (i.e., cementation). [35][36][37][38]52 However, the redox replacement process between as-prepared zinc particles and Ag + ions has not been the subject of any intense investigation. Moreover, cementation processes in previously published studies are usually practiced with relatively high concentrations of silver (hundreds of ppm to g/L level).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…Metallic zinc powders are commonly used as an electron donor for the recovery of silver from hydrometallurgical streams via traditional, nonpulsed redox replacement (i.e., cementation). [35][36][37][38]52 However, the redox replacement process between as-prepared zinc particles and Ag + ions has not been the subject of any intense investigation. Moreover, cementation processes in previously published studies are usually practiced with relatively high concentrations of silver (hundreds of ppm to g/L level).…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Moreover, cementation processes in previously published studies are usually practiced with relatively high concentrations of silver (hundreds of ppm to g/L level). [35][36][37][38]52 In order to investigate the redox replacement reaction in solutions with only minor amounts of Ag (as low as 2 ppm), the following investigation was conducted: Zinc particles were first deposited on GC electrodes from a silver-free zinc electrolyte using 20 cycles of pulse deposition, where one cycle of pulse deposition consists of 0.5 s of potential pulse at −1.65 V, followed by an open circuit potential for 0.5 s. As shown in Figure 2A, zinc particles (Zn atom % > 99.5%) obtained via pulse deposition were found to have a hexagonal structure. A similar morphology has been commonly observed during zinc deposition, and this is possibly due to a lower thermodynamic free energy related to the exposed closest packed plane in hexagonal close-packed (hcp) metals.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
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“…One of the most important uses of thiosulfate solutions has been for application in the photographic industry (in fixing baths and others) to dissolve the silver halide not reduced to metallic silver during photographic or radiographic processes. Today, the industry still generates significant amounts of thiosulfate-based effluents that need to be detoxified for environmental purposes, and to recover the silver [18][19][20][21].…”
Section: Introductionmentioning
confidence: 99%