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- Title
Leaching of Silver and Gold Contained in a Sedimentary Ore, Using Sodium Thiosulfate; A Preliminary Kinetic Study.
- Authors
Roldán-Contreras, Edmundo; Salinas-Rodríguez, Eleazar; Hernández-Ávila, Juan; Cerecedo-Sáenz, Eduardo; Rodríguez-Lugo, Ventura; I. Jeldres, Ricardo; Toro, Norman
- Abstract
Some sedimentary minerals have attractive contents of gold and silver, like a sedimentary exhalative ore available in the eastern of Hidalgo in Mexico. The gold and silver contained represent an interesting opportunity for processing by non-toxic and aggressive leaching reagents like thiosulfate. The preliminary kinetic study indicated that the leaching process was poorly affected by temperature and thiosulfate concentration. The reaction order was −0.61 for Ag, considering a thiosulfate concentration between 200–500 mol·m−3, while, for Au, it was −0.09 for a concentration range between 32–320 mol·m–3. By varying the pH 7–10, it was found that the reaction order was n = 5.03 for Ag, while, for Au, the value was n = 0.94, considering pH 9.5–11. The activation energy obtained during the silver leaching process was 3.15 kJ·mol−1 (298–328 K), which was indicative of a diffusive control of the process. On the other hand, during gold leaching, the activation energy obtained was of 36.44 kJ·mol−1, which was indicative that this process was mixed controlled process, first at low temperatures by diffusive control (298–313 K) and then by chemical control (318–323 K).
- Subjects
HIDALGO (Mexico : State); MEXICO; GOLD ores; LEACHING; ORES; TEMPERATURE control; ACTIVATION energy; THIOSULFATES; RATE coefficients (Chemistry); SILVER
- Publication
Metals (2075-4701), 2020, Vol 10, Issue 2, p159
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met10020159