Eco-efficient melting of glass frits by concentrated solar energy

Romero, Maximina; Robla, J. I.; Padilla, Isabel; García-Hierro, Javier; López‐Delgado, Aurora

doi:10.1016/j.solener.2018.08.077

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…To control the incident solar radiation, a shutter is positioned between the parabolic concentrator (placed on the 6th floor level) and the heliostat (placed on the 1st floor level). This vertical configuration is the only one that allows the melting of glasses without spilling the liquid phase [8]. Figure 1 shows the crucible receiving the solar radiation concentrated by the parabolic reflector, the heliostat, and a detail of the shutter.…”

Section: Methodsmentioning

confidence: 99%

“…The first studies related to the synthesis of glasses from chemical reagents and, by using concentrated solar energy were conducted in the 1980s [5][6][7] nevertheless, this research line has been barely developed since then. Recently, Romero et al [8] studied the production of glass frits from chemical reagents by using concentrated solar energy. The results highlighted that glass frits melted by CSE showed similar features when compared to those manufactured in an electric furnace; furthermore, the process allowed reducing the melting time in about 80%, which results in both less corrosion of the crucible wall and less volatilization of boron during the melting process.…”

Section: Introductionmentioning

confidence: 99%

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Waste and Solar Energy: An Eco-Friendly Way for Glass Melting

Padilla

Romero

Robla³

et al. 2021

ChemEngineering

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In this work, concentrated solar energy (CSE) was applied to an energy-intensive process such as the vitrification of waste with the aim of manufacturing glasses. Different types of waste were used as raw materials: a hazardous waste from the aluminum industry as aluminum source; two residues from the food industry (eggshell and mussel shell) and dolomite ore as calcium source; quartz sand was also employed as glass network former. The use of CSE allowed obtaining glasses in the SiO2-Al2O3-CaO system at exposure time as short as 15 min. The raw materials, their mixtures, and the resulting glasses were characterized by means of X-ray fluorescence, X-ray diffraction, and differential thermal analysis. The feasibility of combining a renewable energy, as solar energy and different waste for the manufacture of glasses, would highly contribute to circular economy and environmental sustainability.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Waste and Solar Energy: An Eco-Friendly Way for Glass Melting

Padilla

Romero

Robla³

et al. 2021

ChemEngineering

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“…The production of frits is conducted in continuous melting furnaces and common temperatures in furnaces ranging between 1350 and 1550 • C. Once the raw materials batch is melted, it is cooled on water at high cooling rate; thus, the melt solidifies as small pieces of glass. This melting process implies a significant energy consumption and low efficiency and productivity of the process, but recently Romero et al [24] have demonstrated, at a laboratory scale, the feasibility of applying real concentrated solar radiation to achieve the energy needed for performing, in only one step, the preparation of glass frits of different typology from the raw materials. The process includes decarbonation, melting and homogenization of molten fluids.…”

Section: Solar Heat For Glass Production/meltingmentioning

confidence: 99%

“…The raw materials used to prepare the glasses were silica sand, with low contents of iron oxide and reagent grade oxide such as Al 2 O 3 , B 2 O 3 , ZnO, PbO and ZrO 2 . To complete the glasses composition, alkali and alkaline earth elements were introduced as reagent grade carbonates [24].…”

Section: Solar Heat For Glass Production/meltingmentioning

confidence: 99%

Solar Heat for Materials Processing: A Review on Recent Achievements and a Prospect on Future Trends

Rosa

2019

ChemEngineering

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Considering works published in the literature for more than a decade (period from January 2008 till June 2019), this paper provides an overview of recent applications of the so-called “solar furnaces”, their reactors, process chambers and related devices, aiming specifically at the processing of (solid) materials. Based on the author’s own experience, some prospects on future trends are also presented. The aim of this work is to demonstrate the tremendous potentialities of the usage of solar heat for materials processing, but also to reveal the necessity of further developing solar-driven high-temperature technologies (which are required to displace the use of electricity or natural gas). In particular, it is essential to improve the temperature homogeneity conditions inside reaction chambers for materials processing using solar heat. Moreover, new innovative modular systems, practical and flexible, for capture, concentration, control and conduction of concentrated solar radiation are suggested. Solar thermal technologies for the production of electricity, as well as solar thermochemical processes for production of gases or liquids, are outside the scope of this review.

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“…Conventional furnace glazing requires a high amount of energy input, low efficiencies (the whole material is heat-treated instead of only the surface) and could have as drawback for the modification in the chemistry of the ceramic substrate, especially in the case of MDF. Glazing could be better achieved by using a concentrated energy source, among which concentrated solar energy has recently proven useful in obtaining vitreous materials by Romero et al [42].…”

Section: Introductionmentioning

confidence: 99%

Polymer-Cement Composites Glazing by Concentrated Solar Energy

et al. 2021

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Macro defect free (MDF) cements are polymer-cement composites characterized by high biaxial flexural strength compared to traditional concrete, having as a drawback a low water resistance. Glazing these composite materials with an inorganic enamel containing TiO2 nano-particles has led to a high water-stable material with advanced photocatalytic properties. Classic glazing by thermal treatment of samples, at 1050 °C, requires energy consumption and long-time performing. The purpose of this paper is to test the use of solar radiation as a source of energy in the glazing process. A vertical axis solar furnace has been used, from PROMES-CNRS Solar Laboratory, Font-Romeu Odeillo, France, and it has been observed that a uniform appearance of the glaze coating has been achieved; it shows high scratch resistance, meaning a good hardness and adhesion to the substrate. The obtained film was also characterized by SEM, EDS and XRD, aiming to evidence the coat morphology, the TiO2 distribution and its crystallinity alteration, when compared to the samples obtained by classic thermal treatment. The conclusion of the paper is that using solar radiation in the MDF cement glazing process is a promising approach for obtaining multifunctional materials.

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Eco-efficient melting of glass frits by concentrated solar energy

Cited by 7 publications

References 21 publications

Waste and Solar Energy: An Eco-Friendly Way for Glass Melting

Waste and Solar Energy: An Eco-Friendly Way for Glass Melting

Solar Heat for Materials Processing: A Review on Recent Achievements and a Prospect on Future Trends

Polymer-Cement Composites Glazing by Concentrated Solar Energy

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