Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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CO2 Fixation by Magnesium Hydroxide from Ferro-Nickel Slag

페로니켈 슬래그로 부터 제조된 Mg(OH)2를 이용한 CO2 고정화

  • Song, Hao-Yang (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Seo, Jong-Beom (Technical Research Center, Hyundai Steel company) ;
  • Kang, Seong-Kuy (Department of Environmental R&D, BK Environmental Construction) ;
  • Kim, In-Deuk (Busan Metropolitan City Yeonjegu Environment & Sanitation division) ;
  • Choi, Bong-Wook (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Oh, Kwang-Joong (Department of Civil and Environmental Engineering, Pusan National University)
  • 송호양 (부산대학교 사회환경시스템공학과) ;
  • 서종범 (현대제철(주) 기술연구소) ;
  • 강성규 (백구엔지니어링(주) 환경R&D 부서) ;
  • 김인득 (부산광역시 연제구청 환경위생과) ;
  • 최봉욱 (부산대학교 사회환경시스템공학과) ;
  • 오광중 (부산대학교 사회환경시스템공학과)
  • Received : 2014.01.24
  • Accepted : 2014.03.21
  • Published : 2014.03.31
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Abstract

In this study, the $Mg(OH)_2$ slurry was made form ferro-nickel slag and then used for $CO_2$ sequestration. The experiments were in the order as leaching step, precipitation, carbonation experiments. According to the leaching results, the optimal leaching conditions were $H_2SO_4$ concentration of 1 M and the temperature of 333 K. In the $Mg(OH)_2$ manufacturing step, NaOH was added to increase the pH upto 8, the first precipitation was confirmed as $Fe_2O_3$. After removal the first precipitation, the pH was upto 11, the $Mg(OH)_2$ was generated by XRD analysis. The $Mg(OH)_2$ slurry was used for $CO_2$ sequestration. The pseudo-second-order carbonation model was used to apply for $CO_2$ sequestration. The $CO_2$ sequestration rate was increased by the $CO_2$ partial pressure and temperature. However, $CO_2$ sequestration rate was decreased when temperature upto 323 K. After $CO_2$ sequestrated by $Mg(OH)_2$, the $CO_2$ can be sequestrated stable as $MgCO_3$. This study also presented optimal sequestration condition was the pH upto 8.38, the maximum $MgCO_3$ can be generated. This study can be used as the basic material for $CO_2$ sequestration by ferro-nickel slag at pilot scale in the future.

본 논문은 페로니켈 슬래그를 이용하여 간접적으로 $CO_2$를 고정화시키는 기술에 대한 연구를 하였으며, 효율적으로 Mg를 추출하여 제조된 $Mg(OH)_2$의 $CO_2$ 고정화 최적 조건을 제시하고자 하였다. 실험 결과, 최적의 추출조건은 1 M $H_2SO_4$, 반응온도 333 K이었으며, 용출액에 NaOH를 첨가하여 pH값을 8까지 높일 경우, 침전물은 $Fe_2O_3$로 확인되었다. 또한 pH 값이 11까지 높아질 때, 그 성분은 $Mg(OH)_2$로 나타났다. 이렇게 제조된 $Mg(OH)_2$ slurry 용액을 $CO_2$ 고정화실험에서 준 2차 탄산화반응 모델을 통해 적용한 결과, 반응온도 및 초기 $CO_2$분압에 따라 초기 $CO_2$의 고정화 속도를 증진할 수 있는 반면 반응온도가 323 K 이상 높아질 경우, 고정화속도가 감소하는 것으로 나타났다. 또한 $CO_2$ 고정화반응 시 이온을 조사한 결과, $CO_2$를 고정화 할 수 있는 최적의 pH 조건으로 8.38 이상 유지해야 할 것으로 판단되었다. 종합적으로 본 연구에서는 페로니켈 슬래그를 이용하여 $CO_2$를 고정화하기 위한 최적의 조건을 도출하였으며, 향후 $CO_2$를 고정화 하기 위한 연구의 기초자료로 활용할 수 있을 것으로 판단된다.

Keywords

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