Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Separation of Heavy Metals From Contaminated Sediments Using Knelson Concentrator

넬슨선별기를 이용한 퇴적토 중 중금속 성분의 분리

  • 고병헌 (한국해양대학교 에너지자원공학과) ;
  • 김종걸 (한국해양대학교 에너지자원공학과) ;
  • 전상희 (한국해양대학교 에너지자원공학과) ;
  • 유경근 (한국해양대학교 에너지자원공학과) ;
  • 김수곤 (신대양 기술연구소) ;
  • 백승한 (한국광해관리공단 광해기술연구소)
  • Received : 2015.11.16
  • Accepted : 2015.12.17
  • Published : 2015.12.31
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Abstract

Fine particles are deposited in port area, and the sediments are dredged regularly. The dredged sediments contaminated with heavy metals must be treated properly. The heavy metal contaminants were separated from the sediments by gravity separation processes such as Knelson concentrator, and the results were compared with those by dense medium separation. The recovery of Pb, Cu, Zn decreases and the contents in the overflow product increases with increasing centrifugal acceleration speed of Knelson concentrator. In the dense medium separation test, the contents of heavy metals in sunk product are higher than those in floated product. Because the heavy metal contaminants were contained in fibrous materials, the components were separated into overflow product in Knelson separation by waterstream working, whereas they precipitated in the dense medium test due to high density. The contents of Pb, Cu, Zn in trapped-product of Knelson separation were 91.1 mg/kg, 238 mg/kg, 89.3 mg/kg, respectively, which indicated that the heavy metals were removed successfully by Knelson separation process.

항만에는 미립토가 퇴적되며 정기적인 준설이 실시되나 중금속으로 오염된 퇴적토의 경우 준설 후 적절한 처리가 필요하다. 비중선별공정을 적용하여 중금속 오염성분을 분리하기 위해 넬슨선별기를 이용한 분리실험을 진행하였고, 중액선별을 실시하여 두 선별법의 결과를 비교하였다. 넬슨선별기 분리실험에서 원심가속도의 증가에 따라 납, 구리, 아연 모두 회수율은 감소하고, 상향흐름 산물 중 함유량은 증가하는 것으로 나타났다. 중액선별결과 중금속 성분은 넬슨선별분리결과와 반대로 침강된 산물에서 높게 분석되었다. 중금속 성분은 섬유상 물질에 함유되어 있어 수류작용에 의해 넬슨선별실험에서는 상향흐름 산물에 포함되고, 중액선별에서는 비중때문에 침강된 산물에 함유된 것으로 분석되었다. 넬슨선별기 내에 잔존하는 산물의 중금속 함량을 분석한 결과, 납, 구리, 아연의 함량은 각각 91.1 mg/kg, 238 mg/kg, 89.3 mg/kg으로 감소하여 성공적으로 중금속 성분이 제거되었다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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