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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Investigation of Arsenic Removal Mechanisms Using Steel Making Slag by Application of Geochemical Equilibrium Model

지구화학적 평형 모델 적용을 통한 제강 슬래그의 비소제거 기작 연구

  • 오참뜻 (한국지질자원연구원 지질재해연구실) ;
  • 박준범 (서울대학교 건설환경공학부) ;
  • 지상우 (한국지질자원연구원 지질재해연구실) ;
  • 정영욱 (한국지질자원연구원 지질재해연구실) ;
  • 임길재 (한국지질자원연구원 지질재해연구실)
  • Published : 2013.04.30
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Abstract

It was performed to evaluate dominant mechanisms occurring when steel making slag removes arsenic in aqueous solution that batch experiments with initial pH and its geochemical equilibrium modeling using Visual MINTEQ. A large amount of calcium was leached from the slag in process of the chemical reaction with the arsenic solution and were precipitated as calcite or amorphous calcium carbonate due to increased solution pH by the slag removing arsenic by co-precipitation or adsorption. When the solution pH was acidic after the batch experiments, calcium precipitates could not be formed. However, it is estimated that ferric oxide, ferrous hydroxide, aluminum oxide, aluminum oxide hydroxide would adsorb arsenic in form of ${HAsO_4}^{2-}$, ${H_2AsO_4}^-$ instead of calcium precipitates in acidic condition. Results of geochemical equilibrium modeling using Visual MINTEQ proved its good applicability being similar with those of previous literatures.

제강 슬래그를 이용해 수용액상의 비소를 제거할 때 발생하는 주 기작을 평가하기 위해 초기 pH를 변화시킨 비소용액과 제강 슬래그의 흡착실험을 수행하고 이에 대한 지구화학적 평형을 Visual MINTEQ을 이용해 모델링하였다. 제강 슬래그와 비소의 화학반응 과정에서 다량의 칼슘이 용출되었고 이는 제강 슬래그로 인해 상승된 용액의 pH에 의해 다시 방해석 및 amorphous calcium carbonate로 침전되면서 공침, 흡착을 통해 비소를 제거하는 것으로 확인된다. 흡착반응 완료 후 용액의 pH가 산성인 경우 칼슘 침전물은 형성되지 못하는 것으로 모사되었으나 ferric oxide, ferrous hydroxide, aluminum oxide, aluminum oxide hydroxide 등이 ${HAsO_4}^{2-}$, ${H_2AsO_4}^-$ 형태의 비소를 흡착하는 것으로 판단된다. Visual MINTEQ을 통한 제강 슬래그-비소 반응의 지구화학적 평형모델링 결과는 선행연구들과 유사한 결과를 보이며 높은 적용 가능성을 보였다.

Keywords

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