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Minerals 2017, 7(2), 25; https://doi.org/10.3390/min7020025

Use of Spent Zeolite Sorbents for the Preparation of Lightweight Aggregates Differing in Microstructure

1
Department of Geotechnical Science, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
2
Department of Physical Chemistry of Porous Materials, Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Peng Yuan
Received: 9 January 2017 / Revised: 10 February 2017 / Accepted: 12 February 2017 / Published: 17 February 2017
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Abstract

Lightweight aggregates (LWAs) made by sintering beidellitic clay deposits at high temperatures, with and without the addition of spent zeolitic sorbents (clinoptilolitic tuff and Na-P1 made from fly ash) containing diesel oil, were investigated. Mineral composition of the aggregates determined by X-ray diffraction was highly uniformized in respect of the initial composition of the substrates. The microstructure of the LWAs, which were studied with a combination of mercury porosimetry, microtomography, nitrogen adsorption/desorption isotherms and scanning electron microscopy, was markedly modified by the spent zeolites, which diminished bulk densities, increased porosities and pore radii. The addition of zeolites decreased water absorption and the compressive strength of the LWAs. The spent Na-P1 had a greater effect on the LWAs’ structure than the clinoptilolite. View Full-Text
Keywords: lightweight aggregate; spent sorbents; petroleum; mercury porosimetry; microtomography; porosity lightweight aggregate; spent sorbents; petroleum; mercury porosimetry; microtomography; porosity
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Franus, W.; Jozefaciuk, G.; Bandura, L.; Franus, M. Use of Spent Zeolite Sorbents for the Preparation of Lightweight Aggregates Differing in Microstructure. Minerals 2017, 7, 25.

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