Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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The Mineralogical and Chemical Characteristics of Fe Impurities and the Efficiency of their Removal Using Microwave Heating and Magnetic Separation in the Pyrophyllite Ore

엽납석광석에 존재하는 Fe 불순물의 광물학적/화학적 특성과 마이크로웨이브 가열 및 자력분리에 의한 제거효과

  • Cho, Kang-Hee (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Kim, Bong-Ju (Dept. of Energy and Resource Engineering, Chosun University) ;
  • Choi, Nag-Choul (Dept. of Rural Systems Engineering/Research Institute for Agriculture and Life Science, Seoul National University) ;
  • Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
  • 조강희 (조선대학교 에너지.자원공학과) ;
  • 김봉주 (조선대학교 에너지.자원공학과) ;
  • 최낙철 (서울대학교 지역시스템공학과) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2015.08.04
  • Accepted : 2016.06.10
  • Published : 2016.06.30
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Abstract

The Fe-component of pyrophyllite is an impurity that reduces its grade in the final product. In order to identify the amount of impurity in pyrophyllite and to remove the Fe from the ore using a dry method, microwave heating and magnetic separation were carried out. Pyrite and hematite were identified to contain pyrophyllite by microscopy, XRD, XRF, SEM/EDS and EPMA analysis. It is suggested that the euhedral pyrite in the pyrophyllite is formed by hydrothermal solution, and then the dissolution cavity structure is formed with a partial remainder of the pyrite which dissolved in acidic water. And the $Fe^{3+}$ ion contained in the acidic water precipitated out in the concentric structure of hematite as the origin of sedimentary structure. As a result of the microwave heating and magnetic separation experiments, the Fe removal rates obtained were 96% and 93% from pyrophyllite ore from the Sunsan mine and Wando mine, respectively. It is confirmed that the microwave heating and magnetic separation method was an environmentally friendly method to upgrade the low-grade pyrophyllite.

엽납석광석에 Fe-성분이 불순물로 작용하여 엽납석의 최종 산업제품의 품위를 저하시키고 있다. 엽납석광석에 존재하는 불순물을 광물-화학적으로 확인하고 마이크로웨이브와 자력선별을 이용하여 Fe 함량을 건식방법으로 감소시키고자 하였다. 광학현미경, XRD, XRF, SEM/EDS 및 EPMA 분석을 통하여 엽납석에 황철석과 적철석이 포함되어 있는 것을 확인하였다. 엽납석에 포함된 자형의 황철석은 열수용액에 의하여 형성되고, 용해 공동 구조는 황철석이 산성수에 의하여 부분적으로 용해되어 형성되는 것으로 사료된다. 그리고 퇴적 기원 구조를 보이는 동심원 구조의 적철석은 산성수에 포함되어 있는 $Fe^{3+}$가 침전되어 형성된 것으로 사료된다. 마이크로웨이브 가열과 자력선별 실험을 수행한 결과 Fe 제거율은 성산광산이 96%, 완도광산이 93%로 나타났다. 마이크로웨이브 가열과 자력선별은 저 품위 엽납석을 품위 향상시킬 수 있는 친환경적 방법이라 사료된다.

Keywords

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