Utilization of waste diatomaceous earth for cellular glass fabrication

abstrakt

angličtina

With increasing c oncerns regarding fire safety and service life of polymer based thermal insulating materials, inorganic thermal insulating materials, such as foam glass, have been gaining significance in past decades. Coupled with environmental efforts and the potential scarcity of glass cullet in certain regions, finding suitable alternative raw materialsfor foam glass production, is a very relevant issue. In this study, low quality diatomaceous earth emerging as a by-product during production of diatomaceous earth for filtration purposes, was used as an alternative raw material for foam glass production. Waste diatomite was thoroughly characterized to assess its suitability for foam glass production. Conversion of this secondary resource to foamed product was achieved via hydrate mechanism, using NaOH solution as foaming agent. Different pre-treatment temperatures and firing regimes were investigated. Changes in high temperature behaviour and materials properties were studied using heating microscopy and TG-DTA analysis. Prepared foams were characterized in terms of their physical and mechanical properties. Microstucture and phase composition were studied using scanning electron microscope and X-ray diffraction analysis, respectively. Highly porous samples with bulk densities ranging from 150 kg/m 3 to 560 kg/m 3 and compressive strength 0,16–1,2 MPa were obtained using direct high temperature foaming of waste diatomaceous earth.

Diatomaceous earth, Foam glass, Porous ceramics

SEDLAČÍK, M.; NGUYEN, M.; OPRAVIL, T.; SOKOLÁŘ, R.

14. 7. 2022

Krakow

978-83-942760-9-6

Ceramics in Europe 2022 - abstract book

248

248

1

https://www.ceramicsineurope2022.org/conf-data/icc2022/files/abstracts.pdf