Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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The Effect of Microwave Heating on the Mineralogical Phase Transformation of Pyrite and Fe Leaching

마이크로웨이브 가열이 황철석의 상변환과 Fe 용출에 미치는 효과

  • You, Don-Sang (Dept. of Leaders in Industry-University Cooperation, Chosun University) ;
  • Park, Cheon-Young (Dept. of Energy and Resource Engineering, Chosun University)
  • 유돈상 (조선대학교 LINC사업단) ;
  • 박천영 (조선대학교 에너지.자원공학과)
  • Received : 2015.06.10
  • Accepted : 2015.09.11
  • Published : 2015.09.30
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Abstract

In order to study the phase transformation of pyrite and to determine the maximum Fe leaching factors, pyrite samples were an electric furnace and microwave oven and then ammonia leaching was carried out. The rim structure of hematite was observed in the sample exposed in an electric furnace, whereas a rim structure consisting of hematite and pyrrhotite were found in the microwave treated sample. Numerous interconnected cracks were only formed in the microwave treated sample due to the arcing effect, and these cracks were not found in the electric furnace treated sample. Under XRD analysis, pyrite and hematite were observed in the electric furnace treated sample, whereas pyrite, hematite and pyrrhotite were found in the microwave treated sample. The results of the pyrite sample leaching experiments showed that the Fe leaching was maximized with the particle size of -325 mesh, sulfuric acid of 2.0 M, ammonium sulfate of 1.0 M, and hydrogen peroxide of 1.0 M. The electric furnace and microwave treated samples were tested under the maximum leaching conditions, the Fe leaching rate was much greater in the microwave treated sample than in the electric furnace treated sample and the maximum Fe leaching time was also faster in the microwave treated sample than in the electric furnace treated sample. Accordingly, it is expected that the microwave heating can enhance (or improve) Fe leaching in industrial minerals as well as pyrite decomposition in gold ores.

전기로와 마이크로웨이브에 노출시킨 황철석 시료에 대하여 광물학적 상변화를 파악하고 Fe 최대 용출 인자들을 결정하고자 하였다. 전기로에 노출시킨 시료에서 적철석으로 구성된 가장자리 구조가 나타난 반면에 마이크로웨이브에 노출시킨 시료는 적철석과 자류철석이 가장자리 구조로 나타났다. 특히 마이크로웨이브에 노출시킨 시료는 결정 내부에 아크방전에 의하여 수많은 크랙들이 서로 연결되어 형성되었지만 전기로에 노출시킨 시료는 크랙이 형성되지 않았다. XRD 분석에서, 전기로에 노출시킨 시료는 황철석과 적철석이 나타났지만 마이크로웨이브에 노출시킨 시료는 황철석, 적철석 및 자류철석이 나타났다. 황철석 시료에 대하여 암모니아 용출실험을 수행하여 Fe 용출률이 최대로 나타나는 인자들은 -325 mesh 입도, 2.0 M의 황산, 1.5 M의 황산암모늄, 1.0 M의 과산화수소 농도에서였다. 용출률이 최대로 나타나는 인자들을 전기로에 그리고 마이크로웨이브 노출 시료에 각각 적용한 결과 전기로 보다 마이크로웨이브에 노출시킨 시료에서 Fe 용출률이 더 많이 그리고 더 빠른 시간에 나타났다. 따라서 산업광물에 포함된 Fe 제거에 혹은 금을 함유하는 황철석 분해에 마이크로웨이브 가열이 효과적일 것으로 사료된다.

Keywords

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