Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Synthesis and Characterizations of Aluminum Hydroxide Using NaOH Additional Amounts and Polyalmuniumchloride

Polyaluminumchloride와 NaOH 첨가량에 따른 수산화알루미늄 합성에 관한 연구

  • Hwang, Dae Ju (Korea Institute of Limestone and Advanced Material) ;
  • Cho, Kye Hong (Korea Institute of Limestone and Advanced Material) ;
  • Choi, Moon Kwan (Korea Institute of Limestone and Advanced Material) ;
  • Ahn, Ji Whan (Mineral Processing Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Han, Choon (Department of Chem. Eng., Kwangwoon Univ.) ;
  • Lee, Jong Dae (Department of Chem. Eng., Chungbuk National Univ.)
  • 황대주 (한국석회석신소연구소 연구개발실) ;
  • 조계홍 (한국석회석신소연구소 연구개발실) ;
  • 최문관 (한국석회석신소연구소 연구개발실) ;
  • 안지환 (한국지질자원연구원 광물자원연구본부 비금속활용연구실) ;
  • 한춘 (광운대학교 화학공학과) ;
  • 이종대 (충북대학교 화학공학과)
  • Received : 2009.11.20
  • Accepted : 2010.01.22
  • Published : 2010.04.30
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Abstract

The water-sewage cohesion agent(polyaluminumchloride(PAC)) and NaOH were used to synthesize $Al(OH)_3$. For various additions of NaOH, characteristics of the synthesized $Al(OH)_3$ was analysed by XRD, SEM and PSA. According to XRD analysis, small amount of NaOH(NaOH:PAC=15g:100g) resulted in amorphous form of $Al(OH)_3$. By increasing NaOH(NaOH:PAC=20g:100g), the mixture of gibbsite(37%), bayerite(35%) and boehmite(28%) were produced. By adding more NaOH(NaOH:PAC=25g:100g), binary mixtures of gibbsite(67%) and bayerite(33%) were formed. Finally, high addition of NaOH(NaOH:PAC=30g:100g) gave the high concentration of gibbsite(gibbsite:bayerite=83:17). Also, SEM analysis indicated that the product featured the plate form with 20 and 30g of NaOH addition. Furthermore it was found that the particle size of the product decreased with the addition of NaOH.

상 하수 응집제인 폴리염화알루미늄(polyaluminumchloride, PAC)과 가성소다(NaOH)를 이용하여 수산화알루미늄을 합성하고, 가성소다(NaOH) 첨가량 변화에 따른 합성물 특징을 고찰하였다. 이 때 합성된 수산화알루미늄의 특징을 XRD, SEM, PSA로 분석하였다. XRD 분석 결과, NaOH 15g에서는 비정질 수산화알루미늄로, NaOH 20g에서는 깁사이트(gibbsite)(37%), 바이어라이트(bayerite)(35%), 보헤마이트(boehmite)(28%)의 혼합상(mixed phase)으로 나타났으며, NaOH 25g에서는 깁사이트(gibbsite)(67%), 바이어라이트(bayerite)(33%)로, NaOH 30g에서는 깁사이트(gibbsite) (83%), 바이어라이트(bayerite)(17%)로 나타났다. SEM 분석 결과, NaOH 25, 30g에서 판형 형태로 분석되었다. PSA 분석 결과, 수산화알루미늄의 입자 크기는 NaOH 첨가량이 증가할수록 감소하였다.

Keywords

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