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Silica and Iron Oxide Recovery and Mineral Carbonation from Serpentine Minerals Using Acid Dissolution and pH Swing Processes

산 처리와 pH 조절을 이용한 사문석군 광물로부터 규소와 철산화물 회수 및 광물 탄산화 연구

  • Baek, Jiyeon (Department of Geological and Environmental Sciences, Chonnam National University) ;
  • Jo, Yeonu (Gwangju Science Academy for the Gifted) ;
  • Lee, Jeongheon (Gwangju Science Academy for the Gifted) ;
  • Kwon, Nayoon (Gwangju Science Academy for the Gifted) ;
  • Kim, Yeram (Gwangju Science Academy for the Gifted) ;
  • Choi, Suk (Gwangju Science Academy for the Gifted) ;
  • Kim, Sunghee (Gwangju Science Academy for the Gifted) ;
  • Roh, Yul (Department of Geological and Environmental Sciences, Chonnam National University)
  • 백지연 (전남대학교 지질환경과학과) ;
  • 조연우 (과학영재학교 광주과학고등학교) ;
  • 이정헌 (과학영재학교 광주과학고등학교) ;
  • 권나윤 (과학영재학교 광주과학고등학교) ;
  • 김예람 (과학영재학교 광주과학고등학교) ;
  • 최숙 (과학영재학교 광주과학고등학교) ;
  • 김성희 (과학영재학교 광주과학고등학교) ;
  • 노열 (전남대학교 지질환경과학과)
  • Received : 2015.12.03
  • Accepted : 2016.03.01
  • Published : 2016.02.28

Abstract

The objectives of this study were to recover silica and iron oxides and $CO_2$ sequestration using serpentine via various acid dissolution and pH swing processes. Serpentine collected from Guhang-myeon in S. Korea were mainly composed of antigorite and magnetite consisting of $SiO_2$ (45.3 wt.%), MgO (41.3 wt.%), $Fe_2O_3$ (12.2 wt.%). Serpentine pulverized ($${\leq_-}75{\mu}m$$) and then dissolved in 3 different acids, HCl, $H_2SO_4$, $HNO_3$. Residues treated with acidic solution were recovered from the solution (step 1). And then the residual solution containing dissolved serpentine was titrated using $NH_4OH$. And pH of the solution increased up to pH=8.6 to obtain reddish precipitates (step 2). After recovery of the precipitates, the residual solution reacted with $CO_2$ and then pH increased up to pH=9.5 to precipitate white materials (step 3). The mineralogical characteristics of the original sample and harvested precipitates were examined by XRD, and TEM-EDS analyses. ICP-AES analysis was also used to investigate solution chemistry. The dissolved ions were Mg, Si, and Fe. The antigorite became noncrystralline silica after acid treatment (step 1). The precipitate at pH=8.6 was mainly amorphous iron oxide, of which size ranged from 2 to 10 nm and mainly consisting of Fe, O, and Si (step 2). At pH=9.5, nesquehonite [$Mg(HCO_3)(OH){\cdot}2(H_2O)$] and lasfordite [$MgCO_3{\cdot}H_2O$] were formed after reaction with $CO_2$ (step 3). The size of carbonated minerals was ranged from 1 to $6{\mu}m$. These results indicated that the acid treatment of serpentine and pH swing processes for the serpentine can be used for synthesis of other materials such as silica, iron oxides and magnesium carbonate. Also, This process may be useful for the precursor synthesis and $CO_2$ sequestration via mineral carbonation.

Keywords

acid dissolution pH swing;resource recovery;$CO_2$ sequestration;antigorite

Acknowledgement

Supported by : Korea CCS R&D Center(KCRC)

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