화력발전소 바닥재로부터 합성된 제올라이트의 반응온도와 알칼리 농도에 따른 상변화에 대한 연구
Synthesis of zeolite with reaction temperature and alkali concentrationfrom coal bottom ash
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초록
국내 화력발전소에서 배출되는 석탄회 중에서 비산재의 재활용률은 점점 증가하고 있으나, 바닥재는 현재 전량 매립되고 있는 실정이다. 이에 본 연구에서는 바닥재로부터 제올라이트를 합성함으로써 바닥재의 고부가가치 물질로의 전 환 가능성을 알아보았다. 실험을 위해 분쇄한 바닥재를 반응온도(80, 120, 150oC) 및 NaOH 농도(1~5 M)를 변화시키면서 알 칼리 수열합성법으로 반응시킨 결과, NaP1, hydrxoy-sodalite, tobermorite 등이 생성되었다. 특히, 120oC 이하의 온도 및 2 M 이하의 NaOH 농도에서 양이온교환능력이 우수한 것으로 알려진 NaP1이 높은 결정성을 갖는 것으로 나타났다.
Abstract
Though the recycling rate of coal fly ash generated from domestic thermoelectric power plants is gradually increased, at present, the most amount of coal bottom ash is disposed by a landfill instead of recycling. Therefore, to reuse a coal bottom ash as high-value materials the synthesis of zeolite made from a coal bottom ash was investigated in this study. NaP1, hydroxy-sodalite and tobermorite were produced through the alkaline hydrothermal reaction of pulverized bottom ash at various temperatures; 80, 120, 150oC, and the concentration of NaOH at the range from 1 to 5 M. Especially, NaP1 with excellent cation exchange capability had a high crystallinity at 2 M NaOH and 120oC.
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