Formation Behavior of Potassium-Chabazite from Coal Fly Ash

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  • 石炭灰フライアッシュからのpotassium-chabaziteの生成挙動
  • セキタンバイ フライアッシュ カラ ノ potassium chabazite ノ セイセイ キョドウ

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Abstract

The objective of this study is to investigate the effect of various reaction conditions on zeolitization from coal fly ash. Hydrothermal syntheses of zeolite were carried out by using KOH as an alkali source. Various physical properties such as surface texture, identification of crystalline materials, cation exchange capacity and so on were evaluated for the obtained zeolites. From these results, the reaction mechanism of zeolite was considered in the hydrothermal synthesis by KOH as an alkali source.<BR>Potassium-chabazite(K-CHA), which is one of the zeoltic materials, is obtained in 2.0 mol / dm3 KOH solution at 393 K of reaction temperature. The production of K-CHA is confirmed to begin at 5h of reaction time, and then the crystallization degree of K-CHA becomes constant at about 10 h. The value of cation exchange capacity(CEC) of the product is about 250 meq / 100 g at 50h of reaction time, at which crystallization degree reaches an saturation state. The reaction rate of K-CHA increases with an increase in KOH concentration, and the CEC in 4.0 mol / dm3 KOH solution at 50 h of reaction time becomes large up to 280 meq / 100 g. The layer of K-CHA crystal in the product is about 80 % as a volume standard.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 118 (5,6), 419-424, 2002

    The Mining and Materials Processing Institute of Japan

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