Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Gold Recovery from Geumsan Concentrate Using Microwave-nitric Acid Leaching and Lead-fire Assay

마이크로웨이브-질산용출과 납-시금법을 이용한 금산정광으로부터 금 회수

  • Lee, Jong-Ju (Department of Energy and Resource Engineering, Chosun University) ;
  • On, Hyun-Sung (Department of Energy and Resource Engineering, Chosun University) ;
  • Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
  • 이종주 (조선대학교 에너지.자원공학과) ;
  • 온현성 (조선대학교 에너지.자원공학과) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2019.05.07
  • Accepted : 2019.06.26
  • Published : 2019.06.30
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Abstract

This study aimed to effectively dissolve sulfide minerals through microwave-nitric acid leaching of invisible gold concentrate and then recover gold from the solid-residue with fire assay. For the purposes, this study conducted microwave-nitric acid leaching experiments to examine nitric acid concentration, time of microwave leaching, and sample addition effect. As results of the experiments, this study discovered that the weight loss rate of solid-residue increased as nitric acid concentration and microwave leaching time increased while weight loss rate decreased as sample addition increased. In an XRD analysis with solid-residue, it was discovered that pyrite completely disappeared when the nitric acid concentrate was 6 M and the microwave leaching time was 18 minutes. When a fire assay was carried out with solid-residue, gold particles with more content were recovered as nitric acid concentration and microwave leaching time increased whereas gold particles with more gold content were recovered as the sample addition decreased.

본 연구 목적은 비-가시성 금 형태로 산출되는 황화광물 정광을 마이크로웨이브-질산용출하여 황화광물을 효과적으로 용해시키고자 하였고, 고체-잔류물을 납-시금법을 적용하여 금을 회수하고자 하였다. 따라서 질산농도, 용출시간 그리고 시료 첨가량 효과에 대하여 마이크로웨이브-용출실험을 각각 수행하였다. 고체-잔류물의 무게 감소율은 질산농도가 증가할수록 그리고 용출시간이 증가할수록 증가하였지만 시료 첨가량이 증가하면 무게 감소율이 감소하였다. 마이크로웨이브-질산용출을 수행한 결과 질산농도 6 M에서, 마이크로웨이브 용출시간 18분에서 황철석이 완전히 사라진 것을 XRD 분석에서 확인하였다. 고체-잔류물에 대하여 납-시금법을 수행한 결과, 질산농도가 증가할수록 그리고 용출시간이 증가할수록 함량이 증가된 금 입자들을 회수하였다. 반면에 시료 첨가량이 증가할수록 금 함량이 감소하는 입자들을 회수하였다.

Keywords

References

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