Effect of Ca in P-doped basaltic glass-ceramics: Application to waste inertization

Tarragó, Mariona; Esteves, H; Garcı́a-Vallés, Maite; Neuville, Daniel R.

doi:10.1016/j.matlet.2018.03.020

Cited by 14 publications

(11 citation statements)

References 7 publications

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“…Afterwards, the microhardness is increased as the structure becomes more compact due to the addition of network modifiers, similar to the rise in density. The microhardness of P‐bearing, Ca‐doped basaltic glasses increases in a similar manner 99 . The addition of network modifiers has been proved to improve the mechanical properties of basalt fibers 100 …”

Section: Resultsmentioning

confidence: 97%

“…The microhardness of P-bearing, Cadoped basaltic glasses increases in a similar manner. 99 The addition of network modifiers has been proved to improve the mechanical properties of basalt fibers. 100 We selected sample B16Ca (27.1-mol% CaO) to develop a glass-ceramic because it contains the highest amount of Ca without increasing viscosity at high temperature.…”

Section: Glass Characterizationmentioning

confidence: 99%

“…This mixture is comparable to USS compositions gathered from the literatureas explained in the introductionin spite of some minor differences. It is enriched in Mg, and specially impoverished in P and Ca when compared to sludge [17,36]. The parent glass can be described as a calcic silicate with high Fe contents, which cause its dark brown color in thin section, black in bulk.…”

Section: Original Glass Characterizationmentioning

confidence: 99%

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Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

Tarragó

Royo

Garcı́a-Vallés

2021

Int J of Appl Glass Sci

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The quantity of sewage sludge generated daily by wastewater treatment plants represents a major environmental problem and a financial burden for plant operators.Valorization strategies focusing on reusing sewage sludge as a raw material are currently developed. Vitrification can help us reduce the volume of waste and binds the components in the structure of chemically stable glasses and glass-ceramics. In this study, the vitrification of sewage sludge inside a basaltic rock has been simulated by producing glasses and a glass-ceramic from basalt enriched in calcium that lie between the stability fields of pyroxene and melilite in the system CaO-MgO-SiO 2 -Al 2 O 3 . CaO addition causes the oxidation of the melt at above the liquidus, increases the crystallization temperature, decreases the melting temperature, and improves the microhardness of the glasses. Glass-ceramic processes improves the properties of the Ca-doped basalt glass. The microhardness of the glass (8.2 GPa) and the glassceramic (8.6 GPa) and leaching tests (in the ppb range) place both the glass and the glass-ceramics at the high end of the mechanical properties and chemical resistance of ceramic tiles for the building industry.

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Section: Resultsmentioning

confidence: 97%

Section: Glass Characterizationmentioning

confidence: 99%

Section: Original Glass Characterizationmentioning

confidence: 99%

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Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

Tarragó

Royo

Garcı́a-Vallés

2021

Int J of Appl Glass Sci

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“…The Raman spectra collected on the mineral wool samples are noticeably similar to Raman spectra of a number of basaltic glasses in the literature. [61][62][63][64][65] The three regions of the spectra have been denoted in the literature as high-, mid-and low-wavenumber (HW, MW, LW), 62 or high-, middle-and low-frequency (HF, MF, LF). [64][65][66] Depending on the intensity of the midwavenumber region, or the degree of convolution with the high-wavenumber region, the spectra can also be split into two regions: low-frequency/wavenumber and high frequency/wavenumber.…”

Section: Discussionmentioning

confidence: 99%

Biomass ashes as potential raw materials for mineral wool manufacture: initial studies of glass structure and chemistry

Backhouse¹,

Guilbot²,

Scrimshire³

et al. 2022

Glass Tech.: Eur, J. Glass Sci. Technol. B

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The energy intensive and CO2-generating nature of commercial mineral wool and glass production necessitates advances and changes in materials and processes. The derivation of raw materials from waste products arising from biomass energy generation offers the possibility of a two-fold environmental benefit: partial replacement of carbonate raw minerals in production, leading to lower CO2 release during melting; and the utilisation and valorisation of byproducts which may otherwise be sent to landfill. Glass samples with a basaltic mineral wool composition were produced with additions to the raw materials of 0, 1, 5 and 10 wt% of a fly ash and a bottom ash arising from biomass combustion. The resulting glasses were analysed by x-ray fluorescence, x-ray diffraction, dilatometry, 57Fe Mössbauer and Raman spectroscopies, and their densities, molar volumes and viscosity–temperature profiles were calculated and compared against benchmark glass samples. All biomass ash-containing glasses were closely similar in both composition and properties to the benchmark glass, with up to 10 wt% ash additions to the raw materials. In addition, the use of the biomass fly ash led to a reduction in batch CO2 content estimated to be 1·5 kg CO2 per tonne of batch for each 1 wt% addition. These initial results provide evidence supporting the further development of these ash materials as potential value-added raw materials for mineral wool manufacture.

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“…The two main alternatives are incineration and landfilling, which generate waste by-products, and space availability and cost issues respectively. Sewage sludge may be mixed with other toxic wastes such as waste mold sands to increase its silica contents and obtain a basalt-like composition to make a valorized product with potential applications in construction [2]. Like basalt, SS-like melts vitrify easily due to their low viscosity above the liquidus and bind the toxic metals [3,4].…”

Section: Introductionmentioning

confidence: 99%

Fe in P-doped basaltic melts: A Mössbauer spectroscopy study

et al. 2018

Self Cite

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The addition of P to a basalt causes a change in the environment of Fe. At low P contents iron is located in the glass structure and the Fe 3+ /Fe 2+ ratio is about 80/20. Further addition of P causes a collapse of the glass structure related to a phase separation that triggers the crystallization of a more reduced iron-containing phosphate phase with a crystalline structure similar to that of stanfieldite, and Mössbauer parameters similar to those of the alluaudite group, together with the formation of a Fe 3+-Fe 2+ disordered phase. Their presence increases the viscosity of the melt.

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Effect of Ca in P-doped basaltic glass-ceramics: Application to waste inertization

Cited by 14 publications

References 7 publications

Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

Biomass ashes as potential raw materials for mineral wool manufacture: initial studies of glass structure and chemistry

Fe in P-doped basaltic melts: A Mössbauer spectroscopy study

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