Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Recovery of Silver from Thiourea Leaching Solution by Cementation Technique

침전법을 이용한 Thiourea 용출용액으로부터 Silver 회수

  • Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University) ;
  • Cho, Kang-Hee (Department of Energy and Resource Engineering, Chosun University) ;
  • Choi, Nag-Choul (Engineering Research Institute, Chonnam National University) ;
  • Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
  • 김봉주 (조선대학교 에너지자원공학과) ;
  • 조강희 (조선대학교 에너지자원공학과) ;
  • 최낙철 (전남대학교 공업기술연구소) ;
  • 박천영 (조선대학교 에너지자원공학과)
  • Received : 2013.10.16
  • Accepted : 2013.02.21
  • Published : 2013.02.28
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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 $1^{st}$ 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.

티오요소 용출용액에 Fe 분말을 첨가하여 silver를 침전법으로 회수하고자하였다. Fe 분말 첨가량, 교반속도, 온도 등과 같은 변수들을 조사하였다. Silver 침전율은 Fe 분말 첨가량, 교반속도 그리고 온도가 증가할수록 증가하였다. 가장 많은 silver 침전율이 나타나는 조건은 Fe 분말 첨가량이 10 g일 때, 교반속도가 500 rpm일 때 였다. Silver 침전율은 Arrhenius 공식에 따라 온도가 증가할수록 증가하였으며, 1차-반응식에 준하여 일어났다. 이들 자료로부터 구한 활성 에너지는 13.73 KJ/mol에서 17.02 KJ/mol이였다. 침전물에 대하여 XRD분석을 수행한 결과 침철석이 검출되었다. 이는 $Fe^0$ 분말 첨가로 인하여 티오요소 용액에서 산화-환원반응이 일어났음을 지시해주는 것이다.

Keywords

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