Silver recovery from simulated photographic baths by electrochemical deposition avoiding Ag2S formation

Prado, Patricia; Ruotolo, Luís A.M.

doi:10.1016/j.jece.2016.06.035

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…According to Prado & Ruotolo (2016), although there is energy consumption in the electrochemical process, it can still be economically attractive when comparing the prices of energy and metallic silver. However, the used parameters, such as electrode potential and the applied current, require strict control during electrolysis in order to avoid uncontrolled reactions and thus loss of recoverable silver (Prado & Ruotolo, 2016).…”

Section: Step 5 -Silver Recovery By Precipitationmentioning

confidence: 99%

Silver Recovery From End-of-Life Photovoltaic Panels

et al. 2020

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The growth of the photovoltaic sector has stood out among renewable sources of energy, due to technological innovations that have brought about cost reductions. Thus, this paper aimed to analyze the technical feasibility of silver recovery from photovoltaic cells using acid leaching, followed by an evaluation of the chemical and electrochemical precipitation processes to analyze their efficiencies. As a primary objective of this work, the gravimetric composition and the metal concentration (Ag, Al, Pb, Cu, and Fe) in the photovoltaic cells were first determined, developing the basis for future research on photovoltaic panels recycling Subsequently, the influence of HNO3 concentration (1-10 mol/L), temperature (25-60ºC), and reaction time were evaluated. A new research application used a statistical tool, the Central Composite Rotational Design (CCRD), as well as samples of different brands and models of photovoltaic panels, in order to ensure the experimental validity. As a highlight, the analysis of the composition of the photovoltaic cells, applying the HNO2CO3, as well as electroprecipitation, made it possible to extract more than 99% of silver in solution, being a primary novelty of this study. Therefore, the studied pathway allowed for the recovery of 99.98% of the silver present in the photovoltaic cells.

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Section: Step 5 -Silver Recovery By Precipitationmentioning

confidence: 99%

Silver Recovery From End-of-Life Photovoltaic Panels

et al. 2020

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“…Con el propósito de obtener resultados más cercanos a la realidad, se estableció una composición representativa de los fijadores radiográficos que se utilizará como disolución electrolítica y que han sido reportados en la bibliografía [8] [12]. De esta manera se utilizó una disolución con una resistividad de 6.25x10 -6 Ω*cm, con un pH de 6 y una concentración de plata, en forma de complejo de tiosulfato de plata (Ag(S 2 O 3 ) 2…”

Section: Procedimiento Experimentalunclassified

“…Así como las semi-reacciones catódica y anódica, ecuaciones 2 y 3, en las cuales se muestra que el depósito de plata metálica sucede en el lado catódico; mientras que el ion sulfato reacciona en el lado anódico [12].…”

Section: -unclassified

Diseño y evaluación termodinámica de un reactor electroquímico para la recuperación de plata de los residuos líquidos del revelado de radiografías

Reyes-Morales

Cobos-Murcia

Reyes-Cruz

et al. 2016

aactm

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El tratamiento de residuos líquidos del revelado de radiografías es un punto de interés para la ingeniería electroquímica, ya que es posible la recuperación de plata metálica de estos desechos. La mayor parte de la tecnología de recuperación que existe en la actualidad está diseñada para operar a nivel industrial, siendo inaccesible para pequeños usuarios que prefieren liberar estas sustancias en el desagüe. Con esta premisa, el siguiente trabajo presenta los estudios termodinámicos empleados en el diseño de un reactor electroquímico para que pequeños usuarios logren la recuperación de Ag de los residuos líquidos del revelado de radiografías. Con el propósito de establecer las condiciones energéticas de potencial y de corriente que aseguren una mayor eficiencia de recuperación de Ag. Los resultados indican que la mayor recuperación de Ag se da cuando se impone un potencial de 0.5 V o cuando se impone una densidad de corriente de 16.66 A/m2. Además, señalan la importancia de fijar la distancia entre los electrodos acorde a la conductividad de la solución, para lograr una mayor eficiencia energética de la celda y evitar su calentamiento, la evolución de hidrógeno y la formación de sulfuro de plata.

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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%

Oxidation of Thiosulfate with Oxygen Using Copper (II) as a Catalyst

Lara

Cardona

Vallmajor

et al. 2019

Metals

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Thiosulfate effluents are generated in the photography and radiography industrial sectors, and in a plant in which thiosulfates are used to recover the gold and silver contained in ores. Similar effluents also containing thiosulfate are those generated from the petrochemical, pharmaceutical and pigment sectors. In the future, the amounts of these effluents may increase, particularly if the cyanides used in the extraction of gold and silver from ores are substituted by thiosulfates, or if the same happens to electronic scrap or in metallic coating processes. This paper reports a study of the oxidation of thiosulfate, with oxygen using copper (II) as a catalyst, at a pH between 4 and 5. The basic idea is to avoid the formation of tetrathionate and polythionate, transforming the thiosulfate into sulfate. The nature of the reaction and a kinetic study of thiosulfate transformation, by reaction with oxygen and Cu2+ at a ppm level, are determined and reported. The best conditions were obtained at 60 °C, pH 5, with an initial concentration of copper of 53 ppm and an oxygen pressure of 1 atm. Under these conditions, the thiosulfate concentration was reduced from 1 g·L−1 to less than 20 ppm in less than three hours.

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Silver recovery from simulated photographic baths by electrochemical deposition avoiding Ag2S formation

Cited by 8 publications

References 15 publications

Silver Recovery From End-of-Life Photovoltaic Panels

Silver Recovery From End-of-Life Photovoltaic Panels

Diseño y evaluación termodinámica de un reactor electroquímico para la recuperación de plata de los residuos líquidos del revelado de radiografías

Oxidation of Thiosulfate with Oxygen Using Copper (II) as a Catalyst

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