Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Treatment of Black Dross with Water and NaOH Solution

물과 수산화나트륨용액에 의한 블랙 드로스의 처리

  • Xing, Wei Dong (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Ahn, Byung Doo (DSLiquid Co., Ltd) ;
  • Lee, Man Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University)
  • Received : 2017.05.08
  • Accepted : 2017.05.26
  • Published : 2017.06.30
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Abstract

Black dross contains metallic aluminium, alumina, silica, MgO, soluble salts together with minor ingredients. Control of silica in black dross is important in transforming the black dross into usable materials. First, most of the soluble salts (KCl and NaCl) in black dross were dissolved in water at reaction temperature of $50^{\circ}C$. Leaching behavior of silica, alumina, MgO and $TiO_2$ from the residue after water treatment was investigated by varying NaOH concentration and reaction temperature. Reaction temperature ($25{\sim}95^{\circ}C$) was favorable to the leaching of alumina but an optimum temperature existed for silica. MgO was not dissolved at all in the NaOH concentration range from 2 to 6 M. At the leaching condition of 5 M NaOH and reaction temperature of $95^{\circ}C$, approximately 80% of alumina and 68% of silica was dissolved.

블랙드로스에는 금속 알루미늄, 알루미나, 실리카, 산화마그네슘, 가용성 염 및 미량 성분이 함유되어 있다. 블랙드로스를 사용가능한 재료로 전환시키기 위해서는 실리카의 양을 조절하는 것이 중요하다. 먼저 가용성 염인 염화나트륨과 염화칼륨은 $50^{\circ}C$에서 물에 용해되었다. 물세척 후 잔사에 함유된 실리카, 알루미나, 산화마그네슘 및 산화타이타늄의 침출거동을 NaOH의 농도와 반응온도를 변화시키며 조사하였다. 반응온도 $25{\sim}95^{\circ}C$에서 알루미나의 침출율은 온도에 비례하나 실리카의 침출의 경우에는 최적 온도가 존재하였다. 한편 2~6 M의 NaOH용액에 산화마그네슘은 전혀 용해되지 않았다. 5 M의 NaOH와 $95^{\circ}C$에서 알루미나와 실리카의 침출율은 각각 80과 68%이었다.

Keywords

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