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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.57  No.5 (2016)  >  pp.726-731

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Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Jingjing Zou1), Chunbin Guo1), Cundi Wei1), Fangfei Li1), Yinshan Jiang1)
1) Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Jilin University

Acid-extracting residue of circulating fluidized bed (CFB) fly ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, fine particles of acid residues have been reused to prepare zeolite Na–X and Na–P with high purity and intensity. Acid residue was used to synthesize zeolite Na–X and Na–P using a single–step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na–X or Na–P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

coal fly ash, acid residue, sodium–X zeolite, sodium–P zeolite, hydrothermal method

Received: December 14, 2015
Accepted: February 09, 2016 , Published online: April 25, 2016



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