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Editor in Chief: RAFFAELLO COSSU

STRONG POROUS GLASS-CERAMICS FROM ALKALI ACTIVATION AND SINTER-CRYSTALLIZATION OF VITRIFIED MSWI BOTTOM ASH

  • Patricia Rabelo Monich - Department of Industrial Engineering, University of Padova, Italy
  • Fulden Dogrul - Department of Metallurgy and Materials Engineering, Sakarya University, Turkey - Department of Industrial Engineering, University of Padova, Italy
  • Hugo Lucas - IME Process Metallurgy and Metal Recycling, RWTH Aachen University, Germany
  • Bernd Friedrich - IME Process Metallurgy and Metal Recycling, RWTH Aachen University, Germany
  • Enrico Bernardo - Department of Industrial Engineering, University of Padova, Italy

DOI 10.31025/2611-4135/2019.13881

Released under CC BY-NC-ND

Copyright: © 2019 CISA Publisher

Editorial History

  • Received: 17 Apr 2019
  • Revised: 11 Jul 2019
  • Accepted: 23 Jul 2019
  • Available online: 23 Dec 2019

Abstract

Vitrification of municipal solid waste incineration (MSWI) bottom ash is an effective method to produce a chemically stable glass, with metal recovery. In order to justify the high costs of this process, the vitrified residue can then be upcycled into potential marketable products. In this study, vitrified bottom ash was successfully converted into strong and chemically stable porous glass-ceramics by the combination of alkali activation and sintering. After the activation of the glass in a NaOH solution of low molarity, foams were easily produced by intensive mechanical stirring, with the aid of a surfactant, and stabilized by gelation. The obtained open-celled material was further consolidated by a sintering treatment, at 800-900°C. The addition of recycled soda-lime glass allowed activation at low molarity and sintering at lower temperature, but it reduced the mechanical properties and the stabilization of heavy metals. On the other hand, the increase in molarity of the alkaline solution increased the porosity and also the strength of foams from vitrified bottom ash.

Keywords


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