Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Synthesis of boehmite powder from aluminum etching solution

알루미늄 에칭액으로부터 베마이트 분말 합성

  • Park, Young-Soo (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Wui, In-Hee (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Woo-Seok (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jin-Ho (Icheon Branch, Korea Institute of Ceramic Engineering and Technology) ;
  • Hwang, Kwang-Taek (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
  • 박영수 (한국세라믹기술원, 이천분원) ;
  • 위인희 (한국세라믹기술원, 이천분원) ;
  • 조우석 (한국세라믹기술원, 이천분원) ;
  • 김진호 (한국세라믹기술원, 이천분원) ;
  • 황광택 (한국세라믹기술원, 이천분원)
  • Received : 2012.10.16
  • Accepted : 2012.11.16
  • Published : 2012.12.31
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Abstract

Boehmite (AlOOH) powder was synthesized using waste aluminium etching solution. In waste solution, precipitated phase was gibbsite ($Al(OH)_3$), and boehmite (AlOOH) phase was obtained at pH of 7 and 8 controlled by addition of acid. Boehmite powder was obtained by washing process to remove the Na ion in precipitated solution. Mean particle size of obtained powder was 40 nm. Boehmite phase transformed to ${\alpha}-Al_2O_3$ phase via ${\gamma}-Al_2O_3$, ${\delta}-Al_2O_3$, and ${\Theta}-Al_2O_3$.

알루미늄 에칭 폐액으로부터 boehmite(AlOOH) 분말을 합성하였다. 폐액에서 침전되어 있는 결정상은 gibbsite ($Al(OH)_3$)였으며, 산을 이용하여 pH를 조절한 결과 pH가 7~8 영역에서 boehmite 결정상이 얻어졌다. 침전 분말에 남아 있는 Na 이온을 제거하고자 세척공정을 진행하여 boehmite 분말을 얻었다. 합성한 분말의 평균입경은 약 40 nm이었다. 또한 열처리 온도가 증가함에 따라 boehmite는 ${\gamma}-Al_2O_3$와 ${\delta}-Al_2O_3$, ${\Theta}-Al_2O_3$를 거쳐 ${\alpha}-Al_2O_3$ 결정상으로 상전이가 일어났다.

Keywords

References

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