Version 1
: Received: 30 August 2018 / Approved: 31 August 2018 / Online: 31 August 2018 (08:59:37 CEST)
How to cite:
Salinas, E.; Hernández-Ávila, J.; Reyes-Valderrama, M.I.; Cerecedo-Sáenz, E.; Mendoza-Anaya, D.; Rodríguez-Lugo, V. Leaching of Silver Contained in Mining Wastes Using the Thiosemicarbazide – Oxygen System. Preprints2018, 2018080543. https://doi.org/10.20944/preprints201808.0543.v1
Salinas, E.; Hernández-Ávila, J.; Reyes-Valderrama, M.I.; Cerecedo-Sáenz, E.; Mendoza-Anaya, D.; Rodríguez-Lugo, V. Leaching of Silver Contained in Mining Wastes Using the Thiosemicarbazide – Oxygen System. Preprints 2018, 2018080543. https://doi.org/10.20944/preprints201808.0543.v1
Salinas, E.; Hernández-Ávila, J.; Reyes-Valderrama, M.I.; Cerecedo-Sáenz, E.; Mendoza-Anaya, D.; Rodríguez-Lugo, V. Leaching of Silver Contained in Mining Wastes Using the Thiosemicarbazide – Oxygen System. Preprints2018, 2018080543. https://doi.org/10.20944/preprints201808.0543.v1
APA Style
Salinas, E., Hernández-Ávila, J., Reyes-Valderrama, M.I., Cerecedo-Sáenz, E., Mendoza-Anaya, D., & Rodríguez-Lugo, V. (2018). Leaching of Silver Contained in Mining Wastes Using the Thiosemicarbazide – Oxygen System. Preprints. https://doi.org/10.20944/preprints201808.0543.v1
Chicago/Turabian Style
Salinas, E., Demetrio Mendoza-Anaya and Ventura Rodríguez-Lugo. 2018 "Leaching of Silver Contained in Mining Wastes Using the Thiosemicarbazide – Oxygen System" Preprints. https://doi.org/10.20944/preprints201808.0543.v1
Abstract
The mining wastes generated during the last decades in the mining region of Pachuca-Real del Monte in Mexico, still contains silver values of interest. For this reason, the present work is a preliminary study of the leaching kinetics of silver contained in these residues, using as a leaching reagent the thiosemicarbazide-oxygen system, with the aim of proposing this leaching system as a less toxic alternative than cyaniding process. Previous the leaching process, representative samples were wholly characterized, finding 56 g of Ag and 0.6 g of Au per ton. For the kinetic study in the mentioned system, were evaluated the reagent concentration, temperature, partial pressure of oxygen, pH and stirring rate. According the experimental results found, it was observed that [CH5N3S] concentration showed a significant effect on the leaching rate, obtaining a reaction order of n = 0.93, in the range of 20 - 40 mol CH5N3S ⋅ m-3, getting so a silver recovery up to 76.9%. The effect of temperature gave an activation energy of Ea = 45.55 KJ mol-1, which was indicative of a chemical reaction control. Finally, partial pressure of oxygen has a notable effect on leaching rate, but pH and stirring rate have not apparent effect.
Keywords
Leaching of silver; Thiosemicarbazide-oxygen system; No toxic leaching process
Subject
Chemistry and Materials Science, Metals, Alloys and Metallurgy
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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