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Bench-scale synthesis of zeolite A from subbituminous coal ashes with high crystalline silica content
Authors:Metta ChareonpanichAuthor Vitae  Ornanong JullaphanAuthor VitaeClarence TangAuthor Vitae
Institution:a Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
b Nanotechnology Center, Kasetsart University, Bangkok 10900, Thailand
c Siam Research and Innovation, Saraburi 18260, Thailand
Abstract:In this present work, fly ash and bottom ash with high crystalline silica content were obtained from the coal-fired boilers within the paper industries in Thailand. These coal ashes were used as the basic raw materials for synthetic zeolite production. The crystal type and crystallinity, specific surface area and pore size, and textural properties of zeolite products were characterized by using X-ray diffraction spectroscopy (XRD), N2 sorption analysis, and Scanning Electron Microscopy (SEM), respectively. It was found that sodalite octahydrate was selectively formed via the direct conventional (one-step) synthesis, whereas through a two-step, sodium silicate preparation and consecutive zeolite A synthesis process, 94 and 72 wt.% zeolite A products could be produced from the fly ash and bottom ash, respectively. The cation-exchange capacity (CEC) of fly ash and bottom ash-derived zeolite A products were closely similar to that of the commercial grade zeolite A.
Keywords:Subbituminous fly ash  Bottom ash  High crystalline silica  Zeolite synthesis
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