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Effect of NaOCl and Gold Plating Additive on the Gold Recovery in Cyclone Electrolytic Cell from Solution for Stripping Gold of PCB by Cyanide

시안을 이용한 PCB 금 박리용액으로부터 사이클론 전해조에서의 금 회수거동에 미치는 차아염소산나트륨과 금 도금첨가제의 영향

  • Jo, Hyeonji (Department of Ocean Energy and Resources Engineering, Korea Maritime and Ocean University) ;
  • Yoo, Kyoungkeun (Department of Ocean Energy and Resources Engineering, Korea Maritime and Ocean University) ;
  • Bae, Mooki (Korea Institute of Geoscience and Mineral Resources) ;
  • Sohn, Jeongsoo (Korea Institute of Geoscience and Mineral Resources) ;
  • Yang, Donghyo (Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Sookyung (Korea Institute of Geoscience and Mineral Resources)
  • 조현지 (한국해양대학교 해양에너지자원공학과) ;
  • 유경근 (한국해양대학교 해양에너지자원공학과) ;
  • 배무기 (한국지질자원연구원) ;
  • 손정수 (한국지질자원연구원) ;
  • 양동효 (한국지질자원연구원) ;
  • 김수경 (한국지질자원연구원)
  • Received : 2017.07.20
  • Accepted : 2017.08.21
  • Published : 2017.08.31

Abstract

The recovery of gold in cyclone type electrolytic cell was conducted from solution for stripping gold of PCB by cyanide. The electrolytic recovery behaviors of gold was investigated by reaction time and addition of electrolytic sodium hypochlorite (NaOCl) and gold plating additive (KG-120). Because the electrolysis generated NaOCl reacted with the cyanide in the leachate by alkaline chlorination, more than 99% of the cyanide was removed at a $NaOCl(g)/CN^-(g)$ ratio of 1.0. When NaOCl was added during the recovery of the gold from cyanide leachate in the cyclone electrolytic cell, the recovery of gold was 98% at the ratio of $NaOCl(g)/CN^-(g)$ from 0.5 to 2.5 in 480 minutes and decreased rapidly over the ratio of 3.0. Gold was recovered more than 99% by adding 1.5 and 4.5%(v/v) of KG-120 with NaOCl in 480 minutes. In particular, when the concentration of KG-120 was 3.5 and 4.5%(v/v), more than 96% of gold was recovered within 240 minutes and the initial recovery rate was relatively faster. The optimum concentration of KG-120 is 3.5%(v/v) considering the economic feasibility and efficiency.

시안을 이용한 PCB 금 박리용액으로부터 사이클론 형태의 전해조를 적용하여 금 회수 연구를 수행하였다. 이때 첨가제로서 전해생성 된 차아염소산나트륨(NaOCl)과 금 도금 첨가제(KG-120)를 사용하였고 이들의 농도와 반응시간에 따른 금의 전해회수 거동을 조사하였다. 전해생성 NaOCl은 침출액 내의 시안과 알칼리 염소화 반응을 촉진함으로써 $NaOCl(g)/CN^-(g)$ 비율 1.0 이상에서 약 99% 이상 시안을 제거할 수 있었다. 금 전해회수 시 전해생성 NaOCl을 첨가할 경우 $NaOCl(g)/CN^-(g)$ 비율이 0.5~2.5일 때 480분 내에 금은 98% 회수되었으며 비율이 3.0이상에서는 오히려 금의 회수율이 현저히 감소하는 것을 알 수 있었다. KG-120 용액의 경우, 1.5~4.5%(v/v)까지의 농도범위에서 480분 내에 금이 99% 회수되었으며, 특히 KG-120의 농도가 3.5 및 4.5%(v/v) 일 경우 240분 내에 금이 96% 이상 회수되어 반응 초기 회수속도가 상대적으로 더 빨랐다. 이로부터 경제성과 효율성을 감안한 최적의 KG-120의 농도는 3.5%(v/v)로 판단된다.

Keywords

References

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