Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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The Selection Effect of Native Gold and Magnetite by Microwave-nitric Acid Leaching and Magnetic/hydro Separation

마이크로웨이브-질산용출과자력/수력선별에의한자연금및자철석의선별효과

  • Lee, Jong-Ju (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
  • 이종주 (조선대학교 에너지.자원공학과) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2020.03.20
  • Accepted : 2020.04.16
  • Published : 2020.04.28
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Abstract

This study aimed to recover native gold from the concentrate using microwave-nitric acid leaching and magnetic/hydro separation experiments. The insoluble-residue was filtered from leaching solution through microwave-nitric acid leaching experiment. As a result of the atomic absorption spectrometer(AAS) analysis of the filtered leaching solution, it was discovered that Au content was not eluted at all and it was observed from the back scattered electron(BSE) image that native gold was liberated in the insoluble-residue. When magnetic/hydro separation experiments were applied for the insoluble-residue, magnetic and non magnetic minerals were separtated from insoluble-residue. Magnetite was recovered from the magnetic minerals and as a result of applying the hydro separation experiment again for the non-magnetic mineral, native gold was recovered. The native gold was identified through the X-ray diffraction(XRD) analysis and BSE image.

본 연구는 마이크로웨이브-질산용출과 자력/수력선별을 이용하여 정광으로부터 자연 금을 회수하는 것을 목표로 하였다. 마이크로웨이브-질산용출실험을 통해 용출용액으로부터 불용성-잔류물을 여과하였다. 용출용액을 원자흡수분광기(AAS)로 분석한 결과 Au는 전혀 용출되지 않은 것을 그리고 불용성-잔류물을 후방산란전자영상(BSE)으로 관찰한 결과 자연 금이 단체분리된 것으로 확인되었다. 불용성-잔류물을 자력/수력선별 하여 자성광물과 비-자성광물로 선별하였다. 자성광물에서 자철석이 회수되었고, 비-자성광물을 다시 수력선별한 결과 자연 금이 회수되었다. 자연 금은 X선 회절 분석(XRD)과 BSE 영상에서 확인되었다.

Keywords

References

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