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Melting behaviour of raw materials and recycled stone wool waste

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Authors:
  • Schultz-Falk, Vickie ;
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    Department of Chemical and Biochemical Engineering, Technical University of Denmark
  • Agersted, Karsten ;
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    unknown
  • Jensen, Peter Arendt ;
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    Orcid logo0000-0001-6784-5321
    Department of Chemical and Biochemical Engineering, Technical University of Denmark
  • Solvang, Mette
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    Rockwool International
DOI:
https://doi.org/10.1016/j.jnoncrysol.2018.01.035
Abstract:
Stone wool is a widely used material for building insulation, to provide thermal comfort along with fire stability and acoustic comfort for all types of buildings. Stone wool waste generated either during production or during renovation or demolition of buildings can be recycled back into the stone wool melt production. This study investigates and compares the thermal response and melting behaviour of a conventional stone wool charge and stone wool waste. The study combines differential scanning calorimetry (DSC), hot stage microscopy (HSM) and X-ray diffraction (XRD). DSC reveals that the conventional charge and stone wool waste have fundamentally different thermal responses, where the charge experiences gas release, phase transition and melting of the individual raw materials. The stone wool waste experiences glass transition, crystallization and finally melting. Both DSC and HSM measurements indicates that the wool waste initiates melting at a lower temperature than the conventional charge. Also DSC measurements show that the wool waste requires less energy for heating and melting than the conventional charge, making stone wool waste recycling desirable both for environmental and for process purposes.
Type:
Journal article
Language:
English
Published in:
Journal of Non-crystalline Solids, 2018, Vol 485, p. 34-41
Keywords:
Stone wool; Melting; Waste; Recycling
Main Research Area:
Science/technology
Submission year:
2018
ID:
2397280166

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