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Recovery of Silver Using Cyclone Type Electrolytic Cell from Thiourea-hydrochloric Acid Mixed Solutions

티오요소와 염산 혼합 용액에서 사이클론 전해에 의한 은(Ag) 회수

  • Cho, Yeon-Chul (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • So, Hong-Il (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Lee, Joo-eun (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Ahn, Jae-Woo (Department of Advanced Materials Sci. & Eng., Daejin University) ;
  • Ryu, Ho-Jin (Yuchuntech)
  • Received : 2017.06.28
  • Accepted : 2017.07.18
  • Published : 2017.08.31

Abstract

A cyclone type electrolytic method was used to recover silver from thiourea-hydrochloric acid mixed solutions. The electrowinning behavior of silver was investigated in different systems, such as the flow rate, current density, silver concentration, thiourea concentration and hydrochloric acid concentration. As the increase of the flow rate, current density and hydrochloric acid concentration, the recovery rate of silver was increased. Whereas, as the increase of silver concentration, the recovery rate of silver was decreased. The thiourea concentration did not affect the Ag recovery and current efficiency. Above 99% of Ag was recovered at the flow rate of 12 L/min., current density of $0.75A/dm^2$, silver concentration of 1.0 g/L, 0.5 M thiourea and 0.1 M hydrochloric acid. In most experimental conditions, silver was recovered as a powder form.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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