scholarly journals Glass-Ceramic Foams from Alkali-Activated Vitrified Bottom Ash and Waste Glasses

2020 ◽  
Vol 10 (16) ◽  
pp. 5714
Author(s):  
Miroslava Hujova ◽  
Patricia Rabelo Monich ◽  
Jaroslav Sedlacek ◽  
Miroslav Hnatko ◽  
Jozef Kraxner ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Bottom Ash ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Phase Assemblage ◽  
Weakly Alkaline ◽  
Glass Addition ◽  
Ceramic Foams ◽  
Weakly Alkaline Solution ◽  
Inorganic Waste

Both vitrified bottom ashes (VBAs) and waste glasses are forms of inorganic waste material that are widely landfilled, despite having some economic potential. Building on previous studies, we prepared glass-ceramic foams by the combination of VBA with either soda-lime glass (SLG) or borosilicate glass (BSG). Suspensions of fine powders in weakly alkaline solution underwent gelation, followed by frothing at nearly room temperature. Hardened “green” foams were sintered, with concurrent crystallization, at 850–1000 °C. All foams were highly porous (>70%), with mostly open porosity. The glass addition was fundamental in both gelation (promoting the formation of carbonate and silicate hydrated phases) and firing steps. While SLG addition enhanced the viscous flow sintering, without a significant impact on the crystallization of gehlenite, the main crystalline phase from the devitrification of VBA, BSG addition caused a reactive sintering, with remarkable changes in the phase assemblage. The glass addition generally also allowed lower sintering temperatures and yielded products with excellent crushing strength. However, only specific conditions resulted in the complete immobilization of pollutants (e.g., Cr3+ ions).

Microstructural and Dielectric Responses of Calcium Copper Titanate Added Soda-Lime Glass for High Frequency Devices

2020 ◽  
Vol 1010 ◽  
pp. 233-238
Author(s):  
Mohd Fariz Ab Rahman ◽  
Mohd Fadzil Ain ◽  
Julie Juliewatty Mohamed ◽  
Siti Roshayu binti Hassan ◽  
Zainal Arifin Ahmad
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Dielectric Properties ◽  
High Frequency ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Glass Addition ◽  
Calcium Copper Titanate ◽  
High Frequency Devices ◽  
Xrd Patterns

The microstructures and dielectric responses of calcium copper titanate (CCTO) ceramics with soda-lime glass addition was investigated. The addition of soda lime glass was varied from 0-5 wt.% by solid-state reaction. The dielectric properties of CCTO indicated that dielectric constant was increased while dielectric loss was decreased after glass addition. The SEM micrographs showed the grain size of CCTO was decreased while the grain boundaries area of CuO + glass were increased after the addition of soda-lime glass. Both XRD patterns of CCTO and CCTO-soda lime glass sintered samples showed the formation of CCTO phase with minor peaks of CuO phase, respectively. These results indicated that soda-lime glass addition gave a significant effect on the microstructural and dielectric responses of CCTO ceramics.

scholarly journals Influence of Soda Lime Glass Addition on the Dielectric Properties of CCTO Ceramics

2018 ◽  
Vol 1082 ◽  
pp. 012042 ◽  
Author(s):  
MF Ab Rahman ◽  
NA Rejab ◽  
ZA Ahmad ◽  
JJ Mohamed ◽  
MF Ain ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Glass Addition

scholarly journals Recyclable Porous Glass-Ceramics from the Smelting of MSWI Bottom Ash

Ceramics ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 1-11
Author(s):  
Patricia Rabelo Monich ◽  
Hugo Lucas ◽  
Bernd Friedrich ◽  
Enrico Bernardo
Keyword(s):  
Porous Glass ◽  
Density Ratio ◽  
Bottom Ash ◽  
Glass Ceramics ◽  
Waste Incineration ◽  
Soda Lime ◽  
Raw Material ◽  
Soda Lime Glass ◽  
Mswi Bottom Ash ◽  
Gel Casting

Material from the electric arc furnace smelting of municipal solid waste incineration (MSWI) bottom ash was easily converted into highly porous glass-ceramics by a combination of inorganic gel casting and sinter-crystallization at 1000 °C. In particular, the gelation of aqueous suspensions of fine glass powders, transformed into “green” foams by intensive mechanical stirring, occurred with a limited addition of alkali activator (1 M NaOH). The products coupled the stabilization of pollutants with good mechanical properties (e.g., compressive strength approaching 4 MPa). Interestingly, they could be used also as raw material for new glass-ceramic foams, obtained by the same gel casting and sintering method, with no degradation of chemical stability. Limitations in the crushing strength, derived from the limited viscous flow densification of semi-crystalline powders, were overcome by mixing powders from recycled foams with 30 wt% soda-lime glass. The new products finally featured an even higher strength-to-density ratio than the foams from the first cycle.

scholarly journals Glass-Ceramic Foams from ‘Weak Alkali Activation’ and Gel-Casting of Waste Glass/Fly Ash Mixtures

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 588 ◽  
Author(s):  
Acacio Rincón Romero ◽  
Nicoletta Toniolo ◽  
Aldo Boccaccini ◽  
Enrico Bernardo
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Alkali Activation ◽  
Ceramic Foams ◽  
Mechanical Stirring ◽  
Gel Casting ◽  
Alumino Silicate ◽  
Crystal Phases

A ‘weak alkali activation’ was applied to aqueous suspensions based on soda lime glass and coal fly ash. Unlike in actual geopolymers, an extensive formation of zeolite-like gels was not expected, due to the low molarity of the alkali activator (NaOH) used. In any case, the suspension underwent gelation and presented a marked pseudoplastic behavior. A significant foaming could be achieved by air incorporation, in turn resulting from intensive mechanical stirring (with the help of a surfactant), before complete hardening. Dried foams were later subjected to heat treatment at 700–900 °C. The interactions between glass and fly ash, upon firing, determined the formation of new crystal phases, particularly nepheline (sodium alumino–silicate), with remarkable crushing strength (~6 MPa, with a porosity of about 70%). The fired materials, finally, demonstrated a successful stabilization of pollutants from fly ash and a low thermal conductivity that could be exploited for building applications.

scholarly journals Histological response of soda-lime glass-ceramic bactericidal rods implanted in the jaws of beagle dogs

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
José S. Moya ◽  
Arturo Martínez ◽  
Roberto López-Píriz ◽  
Francisco Guitián ◽  
Luis A. Díaz ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Bone Formation ◽  
Glass Ceramic ◽  
Fungal Infections ◽  
Clinical Signs ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Histological Response ◽  
Beagle Dogs ◽  
Clinical Challenge

Abstract Bacterial and fungal infections remain a major clinical challenge. Implant infections very often require complicated revision procedures that are troublesome to patients and costly to the healthcare system. Innovative approaches to tackle infections are urgently needed. We investigated the histological response of novel free P2O5 glass-ceramic rods implanted in the jaws of beagle dogs. Due to the particular percolated morphology of this glass-ceramic, the dissolution of the rods in the animal body environment and the immature bone formation during the fourth months of implantation maintained the integrity of the glass-ceramic rod. No clinical signs of inflammation took place in any of the beagle dogs during the four months of implantation. This new glass-ceramic biomaterial with inherent bactericidal and fungicidal properties can be considered as an appealing candidate for bone tissue engineering.

scholarly journals Erratum: Erratum: Histological response of soda-lime glass-ceramic bactericidal rods implanted in the jaws of beagle dogs

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
José S. Moya ◽  
Arturo Martínez ◽  
Roberto López-Píriz ◽  
Francisco Guitián ◽  
Luis A. Díaz ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Histological Response ◽  
Beagle Dogs

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

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 959
Author(s):  
Acacio Rincón Romero ◽  
Daniele Desideri ◽  
Aldo Boccaccini ◽  
Enrico Bernardo
Keyword(s):  
Glass Ceramics ◽  
Weakly Alkaline ◽  
Ceramic Foams ◽  
Mechanical Stirring ◽  
Recycled Glass ◽  
Magnetite Fe3o4 ◽  
High Dielectric Permittivity ◽  
Inorganic Waste ◽  
High Dielectric ◽  
Highly Porous

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).

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