The Synthesis of Hydrated Aluminum Sulfate from Kaolin Using Microwave Energy

카올린으로부터 마이크로파 에너지를 이용한 무기고분자인 수화 황산 알루미늄의 합성

  • Received : 1997.11.03
  • Accepted : 1998.05.23
  • Published : 1998.08.10

Abstract

Hydrated aluminum sulfate, an inorganic polymer, was synthesized from kaolin in $H_2SO_4$ solution using microwave energy. The maximum rates of alumina extracted from calcined kaolin were 72.8% in a conventional process ($80^{\circ}C$, 1M, and 180min) and 99.9% in a microwave process ($90^{\circ}C$, 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 $1100^{\circ}C$, both products on conventional and microwave processes were ${\gamma}-Al_2O_3$ with agglomerated powders of spherical shape. The specific area of the products in conventional and microwave processes were 113.5 and $106.6m^2/g$, and their average grain sizes were 46.5 an $26.3{\mu}m$, respectively.

Keywords

Microwave;Extraction;Kaolin;Hydrated Aluminum Sulfate;${\gamma}-Al_2O_3$

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