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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received November 20, 2009
Accepted January 22, 2010

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Polyaluminumchloride와 NaOH 첨가량에 따른 수산화알루미늄 합성에 관한 연구

Synthesis and Characterizations of Aluminum Hydroxide Using NaOH Additional Amounts and Polyalmuniumchloride

최문관¹ 황대주^{1 2†} 조계홍^{1 3} 안지환⁴ 한춘³ 이종대²

Moon Kwan Choi¹ Dae Ju Hwang^{1 2†} Kye Hong Cho^{1 3} Ji Whan Ahn⁴ Choon Han⁵ Jong Dae Lee²

¹한국석회석신소연구소 연구개발실, 395-903 충북 단양군 매포읍 우덕리 63 ²충북대학교 화학공학과, 361-763 충북 청주시 흥덕구 성봉로 410 ³광운대학교 화학공학과, 139-701 서울특별시 노원구 월계동 447-1 ⁴한국지질자원연구원 광물자원연구본부 비금속활용연구실, 305-350 대전광역시 유성구 과학로 92

¹Korea Institute of Limestone and Advanced Materials, 63 Wooduk-ri, Maepo-up, danyang-gun, Chungbuk 395-903, Korea ²Department of Chem. Eng., Chungbuk National Univ., 410 Sungong-ro, Heungduk-gu, Chung-ju, Chungbuk 361-763, Korea ³Department of Chem. Eng., Kwangwoon Univ., 447-1 Wolgyedong, Nowon-gu, Seoul 139-701, Kore, Korea ⁴Mineral Processing Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, 92 Science-ro, Yuseong-gu, Daejeon 305-350, Korea ⁵Department of Chem. Eng., Kwangwoon Univ., 447-1 Wolgyedong, Nowon-gu, Seoul 139-701, Korea

hdj1057@limestone.re.kr

Korean Chemical Engineering Research, April 2010, 48(2), 205-211(7), NONE Epub 3 May 2010

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Abstract

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.

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_x000D_ 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.

Keywords

Aluminum hydroxide Gibbsite Bayerite Boehmite Polyaluminumchloride(PAC)

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