Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Thermal Decomposition of Arsenopyrite by Microwave Heating and the Effect of Removal Arsenic with Wet-magnetic separation

마이크로웨이브 가열에 의한 황비철석의 열분해와 습식-자력선별에 의한 비소 제거 효과

  • On, Hyun-Sung (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Kim, Hyun-Soo (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Myung, Eun-Ji (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Lim, Dae-Hack (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
  • 온현성 (조선대학교 에너지.자원공학과) ;
  • 김현수 (조선대학교 에너지.자원공학과) ;
  • 명은지 (조선대학교 에너지.자원공학과) ;
  • 임대학 (조선대학교 에너지.자원공학과) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2017.08.17
  • Accepted : 2017.09.26
  • Published : 2017.09.30
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Abstract

In order to transform arsenopyrite into pyrrhotite and to decrease As content by less than 2,000 mg/kg, pulp sample and non-magnetic pulp sample were heated in a microwave oven at different heating times and were separated through wet-magnetic separation. As the microwave heating time increased, the phase of pyrrhotite was extended to become arsenopyrite entirely. The melting pores and micro-cracks occurred on the pyrrhotite due to hot spot phenomenon with microwave heating. The heated raw pulp sample (As content : 19,970.13 mg/kg) and non-magnetic pulp sample (As content : 19,970.13 mg/kg) which were heated in a microwave oven for 10 minutes were separated through wet-magnetic separation and magnetic fraction containing less than 2,000 mg/kg of As content was recovered only from the heated sample of magnetic separation. It was discovered that for the sulfide complex ore with As penalty imposed on, if microwave heating and wet-magnetic separation are effectively utilized, magnetic fraction. We expect to be able to obtain ore minerals with an arsenic content below the penalty charge.

광액시료와 비-자성광액시료에 포함된 황비철석을 자류철석으로 상변환 시키기 위하여 그리고 비소 함량을 2,000 mg/kg 이하로 제거하기 위하여 마이크로웨이브 장치를 다양한 시간으로 가열하였고, 습식-자력선별하였다. 마이크로웨이브 가열시간이 증가함에 따라 황비철석 표면의 가장자리부터 자류철석으로 상변환이 일어났고, 열점 현상에 의하여 자류철석 내부에 용융공극과 마이크로-크랙들이 형성되었다. 마이크로웨이브 가열을 10분간 수행한 광액시료(비소 함량 : 14,732.66 mg/kg)와 비-자성 광액시료(비소 함량 : 19,970.13 mg/kg)를 습식-자력선별하여 자성광물로 분리시킨 결과, 10분 가열한 자성광물 시료에서 만 비소 함량이 2,000 mg/kg 이하로 나타났다. 따라서 향후 비소 페널티부과 대상인 복합황화광물을 마이크로웨이브 가열과 습식-자력선별을 효과적으로 활용하면, 비소 함량을 페널티 부과대상 이하의 광석광물을 얻을 수 있을 것으로 기대한다.

Keywords

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