카올린으로부터 마이크로파 에너지를 이용한 무기고분자인 수화 황산 알루미늄의 합성

박성수; 황은희; 박희찬

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.4, 481-485, August, 1998

Export Citation

카올린으로부터 마이크로파 에너지를 이용한 무기고분자인 수화 황산 알루미늄의 합성

The Synthesis of Hydrated Aluminum Sulfate from Kaolin Using Microwave Energy

박성수, 황은희, 박희찬

초록

마이크로파 열원을 이용하여 황산 용액에서 카올린을 가열 반응시켜 무기고분자인 수화 황산 알루미늄을 합성하였다. 하소된 카올린으로부터 알루미나의 최대 추출율은 재래식 열공정 (80 ℃, 1 M 및 240분)에서 72.8%이었고, 마이크로파 공정 (90 ℃ 1 M 및 60분)에서 99.9%이었다. 재래식 열공정에서와는 달리 마이크로파 공정에서 추출 합성된 수화 황산 알루미늄 시료는 빠른 결정립 성장에 의해 거대크기의 판상으로 이루어진 층상구조로 존재하였다. 마이크로파와 재래식 열공정에서 합성하여, 1100 ℃에서 하소된 시료들을 모두 구형으로 응집된 분말상의 γ-Al₂O₃존재하였고, 이 시료들의 비표면적은 각각 113.5와 106.6 m²/g이었고, 입자의 평균 입경은 각각 46.5와 26.3μm이었다.

Hydrated aluminum sulfate, an inorganic polymer, was synthesized from kaolin in H₂SO₄ solution using microwave energy. The maximum rates of alumina extracted from calcined kaolin were 72.8% in a conventional process (80℃, 1M, and 180min) and 99.9% in a microwave process (90℃, 1M, and 60 min). Compared with the conventional one, the hydrated aluminum sulfate synthesized under the microwave process had layer structure consisting of plate-shaped large grains. After synthesis and then calcination at 1100℃, both products on conventional and microwave processes were γ-Al₂O₃ with agglomerated powders of spherical shape. The specific area of the products in conventional and microwave processes were 113.5 and 106.6m²/g, and their average grain sizes were 46.5 an 26.3 ㎛, respectively.

Keywords:Microwave;Extraction;Kaolin;Hydrated Aluminum Sulfate;γ-Al₂O₃

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[7] Herz J, Chang J, Brodwin M, MRS Symp. Proc., 347, 711 (1994)

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[14] Nightingale SA, Wormer HK, Dunne DP, J. Am. Ceram. Soc., 80, 394 (1997)

[15] Janney MA, Kimrey HD, Allen WR, Kiggans JO, J. Mater. Sci., 32(5), 1347 (1997)

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[23] 백용혁, 이종근, 요업학회지, 19, 157 (1982)

[24] Kato E, Daimon K, Nanbu M, J. Am. Ceram. Soc., 64, 436 (1981)