Econ. Environ. Geol. 2013; 46(1): 29-37

Published online February 28, 2013

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

The Recovery of Silver from Thiourea Leaching Solution by Cementation Technique

Bong-Ju Kim1, Kang-Hee Cho1, Nag-Choul Choi2 and Cheon-Young Park1*

1Department of Energy and Resource Engineering, Chosun University, Gwangju, Korea
2Engineering Research Institute, Chonnam National University, Gwang-ju, Korea

Received: October 16, 2013; Accepted: February 21, 2013

Abstract

In order to apply the silver cementation method using Fe powder from pregnant thiourea leaching solution. Parameters such as the amount of Fe powder addition, agitation speed, and temperature were investigated. The silver cementation rate was increased by the increasing of Fe powder addition, agitation speed, and temperature. The highest silver cementation rate was found when the addition of Fe powder was 50 g/L at the agitation speed of 500 rpm. The silver cementation rate increase with increasing temperature according to the Arrhenius equation and obeys 1st order kinetics. The activation energy from the kinetics data was found to be between 13.73 KJ/mol and 17.02 KJ/mol. In the XRD analysis, goethite was detected in the precipitate of the thiourea leach solution. This indicates that an oxidation-reduction reaction had occurred in the thiourea solution due to the addition of the Fe powder.

Keywords silver, cementation, Fe-powder, Arrhenius equation, the first-oder kinetic

Article

Econ. Environ. Geol. 2013; 46(1): 29-37

Published online February 28, 2013

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

The Recovery of Silver from Thiourea Leaching Solution by Cementation Technique

Bong-Ju Kim1, Kang-Hee Cho1, Nag-Choul Choi2 and Cheon-Young Park1*

1Department of Energy and Resource Engineering, Chosun University, Gwangju, Korea
2Engineering Research Institute, Chonnam National University, Gwang-ju, Korea

Received: October 16, 2013; Accepted: February 21, 2013

Abstract

In order to apply the silver cementation method using Fe powder from pregnant thiourea leaching solution. Parameters such as the amount of Fe powder addition, agitation speed, and temperature were investigated. The silver cementation rate was increased by the increasing of Fe powder addition, agitation speed, and temperature. The highest silver cementation rate was found when the addition of Fe powder was 50 g/L at the agitation speed of 500 rpm. The silver cementation rate increase with increasing temperature according to the Arrhenius equation and obeys 1st order kinetics. The activation energy from the kinetics data was found to be between 13.73 KJ/mol and 17.02 KJ/mol. In the XRD analysis, goethite was detected in the precipitate of the thiourea leach solution. This indicates that an oxidation-reduction reaction had occurred in the thiourea solution due to the addition of the Fe powder.

Keywords silver, cementation, Fe-powder, Arrhenius equation, the first-oder kinetic

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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