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Article

Up-Cycling of Iron-Rich Inorganic Waste in Functional Glass-Ceramics

1
Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
2
Department of Industrial Engineering, University of Padova, Via Gradenigo 6/A, 35131 Padova, Italy
3
Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstraße 6, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(11), 959; https://doi.org/10.3390/min10110959
Received: 1 October 2020 / Revised: 23 October 2020 / Accepted: 25 October 2020 / Published: 27 October 2020
(This article belongs to the Special Issue Clay Minerals and Waste Fly Ash Ceramics)
The intensive mechanical stirring of suspensions of recycled glass and inorganic waste powders in ‘weakly alkaline’ aqueous solutions (e.g., 2.5–3 NaOH), followed by viscous flow sintering at 800–1000 °C, easily yields highly porous glass-ceramic foams. The firing determines just the consolidation of powders with concurrent incorporation of pollutants from iron-rich waste, such as fly ash from coal combustion (FA). Engineered mixtures allow for the obtainment of chemically stable foams from treatments in air. Treatments in nitrogen are even more significant since they extend the conditions for stabilization and promote novel functionalities. In addition, the change in the atmosphere favors the formation of magnetite (Fe3O4), in turn enabling ultra-high dielectric permittivity and semiconductivity. Such a condition was further evidenced by preliminary tests on recycled glass combined with residues from the Bayer processing of aluminum ores or red mud (RM). View Full-Text
Keywords: glass-ceramics; viscous flow sintering; cellular ceramics; alkaline activation; gel casting; electrical functionalities glass-ceramics; viscous flow sintering; cellular ceramics; alkaline activation; gel casting; electrical functionalities
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MDPI and ACS Style

Rincón Romero, A.; Desideri, D.; Boccaccini, A.R.; Bernardo, E. Up-Cycling of Iron-Rich Inorganic Waste in Functional Glass-Ceramics. Minerals 2020, 10, 959. https://doi.org/10.3390/min10110959

AMA Style

Rincón Romero A, Desideri D, Boccaccini AR, Bernardo E. Up-Cycling of Iron-Rich Inorganic Waste in Functional Glass-Ceramics. Minerals. 2020; 10(11):959. https://doi.org/10.3390/min10110959

Chicago/Turabian Style

Rincón Romero, Acacio, Daniele Desideri, Aldo R. Boccaccini, and Enrico Bernardo. 2020. "Up-Cycling of Iron-Rich Inorganic Waste in Functional Glass-Ceramics" Minerals 10, no. 11: 959. https://doi.org/10.3390/min10110959

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