Preprint Article Version 1 This version is not peer-reviewed

Reprocessing of Mining Wastes for the Recovery of Silver by Leaching in the Thiosemicarbazide – Oxygen System

Version 1 : Received: 16 August 2018 / Approved: 16 August 2018 / Online: 16 August 2018 (15:20:17 CEST)

How to cite: Hernández-Ávila, J.; Reyes-Valderrama, M.I.; Cerecedo-Sáenz, E.; Mendoza-Anaya, D.; Rodríguez-Lugo, V.; Salinas, E. Reprocessing of Mining Wastes for the Recovery of Silver by Leaching in the Thiosemicarbazide – Oxygen System. Preprints 2018, 2018080294 (doi: 10.20944/preprints201808.0294.v1). Hernández-Ávila, J.; Reyes-Valderrama, M.I.; Cerecedo-Sáenz, E.; Mendoza-Anaya, D.; Rodríguez-Lugo, V.; Salinas, E. Reprocessing of Mining Wastes for the Recovery of Silver by Leaching in the Thiosemicarbazide – Oxygen System. Preprints 2018, 2018080294 (doi: 10.20944/preprints201808.0294.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.

Subject Areas

Reprocessing of mining wastes; Leaching of silver; Thiosemicarbazide-oxygen system; No toxic leaching process

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.