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Synthesis of natural zeolite agglomerates: clinoptilolite-based geopolymers through aluminate activation

Published online by Cambridge University Press:  12 November 2019

Aleksander Nikolov ,
Henk Nugteren ,
Ognyan Petrov ,
Ivan Rostovsky ,
Tanya Petrova  and
Zlatka Delcheva
Aleksander Nikolov*
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Science (IMC-BAS), Sofia, Bulgaria
Henk Nugteren
Affiliation:
Department of Chemical Engineering, University of Technology, Delft, The Netherlands
Ognyan Petrov
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Science (IMC-BAS), Sofia, Bulgaria
Ivan Rostovsky
Affiliation:
Department of Building Materials and Insulations, UACEG, Sofia, Bulgaria
Tanya Petrova
Affiliation:
Institute of Catalysis, Bulgarian Academy of Sciences, Sofia, Bulgaria
Zlatka Delcheva
Affiliation:
Institute of Mineralogy and Crystallography, Bulgarian Academy of Science (IMC-BAS), Sofia, Bulgaria
*
*Email: [email protected]
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Abstract

Natural zeolite (clinoptilolite)-based geopolymers were synthesized using alkali aluminate solution, including aluminate anodizing waste solution. The effect of calcination of the clinoptilolite sample at 900°C was investigated. The samples were studied by powder X-ray diffraction, thermal analysis, scanning electron microscopy and N2-specific surface area. The alkali aluminate-activated clinoptilolite geopolymers are characterized by satisfactory compressive strength (up to 37 MPa), low density and acceptable shrinkage. The clinoptilolite geopolymer obtained contains an X-ray amorphous phase and newly formed phillipsite and zeolite NaP. The presence of zeolite phases in the geopolymer agglomerate could be beneficial in products with specific qualities and properties, such as ion exchange, passive cooling, antimicrobial activity, etc.

Keywords

clinoptilolitegeopolymermetazeolitenatural zeolitesodium aluminate
Type
Article
Information
Clay Minerals , Volume 54 , Issue 4 , December 2019 , pp. 393 - 400
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019

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Footnotes

Guest Associate Editor: M. Wdowin

This paper was submitted for the special issue devoted to the 10th International Conference on the Occurrence, Properties, and Utilization of Natural Zeolites (June 2018, Krakow, Poland).

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