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Información tecnológica

versión On-line ISSN 0718-0764

Resumen

HERNANDEZ, Juan; RIVERA, Isauro; PATINO, Francisco  y  JUAREZ, Julio C. Kinetic Study of the Leaching of Silver in the System S2O32--O2-Cu2+,Contained in Mining-Metallurgical Waste. Inf. tecnol. [online]. 2013, vol.24, n.1, pp.51-58. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642013000100007.

A study on the leaching kinetics of silver involved in the system S2O32- -O2-Cu2+ that is found in the tailings of Dos Carlos in the state of Hidalgo in Mexico. The concentration of [S2O32-] considerably affects the leaching rate obtaining a value of 0.o98 for the order of reaction in the range of concentrations from15.8 to 126.4 gL-1 of S2O32-, achieving silver recovery of 73%. The effect of temperature and of the addition of copper has been also analyzed. Temperature has a remarkable effect over the overall reaction rate in the range from 15 to 60 °C. Solutions of silver of 97% were obtained at the highest temperature of the study obtaining a value of 43 kJ mol-1 for the activation energy.  Copper addition favored the leaching rate of silver, obtaining a reaction order of 0.35 with respect to the concentration of [Cu2+] and reaching 95% of leached silver.

Palabras clave : leaching; kinetics; order of reaction; production of silver; mining-metallurgical waste.

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