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- Title
RECUPERACIÓN DE ORO DESDE SOLUCIONES DE TIOSULFATO AMONIACAL MEDIANTE CEMENTACIÓN Y ELECTRODEPOSICIÓN.
- Authors
Caroprese, María E.; Meissl, Roberto; Lara, Rodolfo; Quinzano, Victor
- Abstract
In this work, the results of recovering gold from ammoniacal thiosulfate solutions through cementing and electrodeposition were studied and analyzed. In cementation, the kinetic aspects of gold precipitation were analyzed using zinc and aluminum powder as cementing agents. The variations in the concentrations of the reducing agents, copper and gold as a function of time were analyzed to evaluate the influence of the previous deoxygenation and the activation energy was determined. The gold recoveries were greater than 98% for both reducers. The results showed that zinc is better cement, since aluminum, despite having a higher reaction speed, destroys thiosulfate. The highest consumption of zinc and aluminum was due to the deposition of copper, a ratio was observed (1: 1) and (2: 5) respectively. In zinc cementation, the gold concentrations were taken as a function of time for different reaction temperatures, the linearized form of the Arrenius equation was graphed to obtain the activation energy (Ea) which was found to be 15.43 KJ / mol. This value responds to a diffusive control for the reaction, and is similar to that found for processes with prior deoxygenation. This would indicate that, unlike the cementation of gold from cyanide solutions, the deoxygenation of these solutions would not be necessary. The experimental data of the electrolysis were adjusted to a model C = f (t) with R2 greater than 0.94. This allowed the calculation of the gold mass transfer coefficient (0.80 x10-6 m/s). This result is in the same order as that obtained by other authors for the electrodeposition of gold of cyanized solutions, (1.3x10-6 m / s) for a fluid velocity of 4.80x10-3 m / s. A final recovery of gold was obtained (92.1%) and copper co-precipitation was confirmed.
- Subjects
MASS transfer coefficients; ZINC powder; ALUMINUM powder; DEOXYGENATION; ACTIVATION energy; ELECTROFORMING; REDUCING agents
- Publication
La Revista Latinoamericana de Metalurgia y Materiales, RLMM, 2019, Vol S8, Issue 1, p13
- ISSN
0255-6952
- Publication type
Article