Characterization by Thermal Analysis of Natural Kieselguhr and Sand for Industrial Application

Meradi, Hazem; Atoui, L.; Bahloul, Lynda; Boubendira, Khaled; Bouazdia, Abdelhak; Ismail, Fadhel

doi:10.1016/j.egypro.2015.07.773

Cited by 25 publications

(14 citation statements)

References 14 publications

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“…In this way, the production steps were minimized, and energy consumption and the risks associated with the high temperatures (T > 340 °C) of the melting method were reduced. To maximize the percentage of impregnation, it was decided to operate in depression to minimize the capillary tension inside the cavities of the porous media, both in the absorption phase and in the drying DIA2 diatomite, although calcined, shows a very slight weight loss around 293 • C, also attributable to the presence of molecular water [64,67]. Diatomite does not show significant weight loss attributable to thermal degradation, so it is suitable for use as a porous material for PCM encapsulation.…”

Section: Methods Of Encapsulation Of Pcmmentioning

confidence: 99%

“…Economic factors are unavoidable for a good outcome of the project, especially in consideration of the large quantities required for the use of large plants in TES, so the cost must be competitive. Finally, the eco-sustainability of both raw materials and the entire life cycle of the materials should not be overlooked [61][62][63][64][65]. Based on the criteria taken into consideration, a porous calcined diatomite supplied by DEREF SpA, named DIA2, was selected.…”

Section: Selection Of the Porous Media For Encapsulationmentioning

confidence: 99%

“…Figure 5 shows the TG/DTG plot of the selected diatomite. DIA2 diatomite, although calcined, shows a very slight weight loss around 293 °C, also attributable to the presence of molecular water [64,67]. Diatomite does not show significant weight loss attributable to thermal degradation, so it is suitable for use as a porous material for PCM encapsulation.…”

Section: Selection Of the Porous Media For Encapsulationmentioning

confidence: 99%

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Development and Characterization of Concrete/PCM/Diatomite Composites for Thermal Energy Storage in CSP/CST Applications

Miliozzi

Dominici

Candelori³

et al. 2021

Energies

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Thermal energy storage (TES) systems for concentrated solar power plants are essential for the convenience of renewable energy sources in terms of energy dispatchability, economical aspects and their larger use. TES systems based on the use of concrete have been demonstrated to possess good heat exchange characteristics, wide availability of the heat storage medium and low cost. Therefore, the purpose of this work was the development and characterization of a new concrete-based heat storage material containing a concrete mix capable of operating at medium–high temperatures with improved performance. In this work, a small amount of shape-stabilized phase change material (PCM) was included, thus developing a new material capable of storing energy both as sensible and latent heat. This material was therefore characterized thermally and mechanically and showed increased thermal properties such as stored energy density (up to +7%, with a temperature difference of 100 °C at an average operating temperature of 250 °C) when 5 wt% of PCM was added. By taking advantage of these characteristics, particularly the higher energy density, thermal energy storage systems that are more compact and economically feasible can be built to operate within a temperature range of approximately 150–350 °C with a reduction, compared to a concrete-only based thermal energy storage system, of approximately 7% for the required volume and cost.

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Section: Methods Of Encapsulation Of Pcmmentioning

confidence: 99%

Section: Selection Of the Porous Media For Encapsulationmentioning

confidence: 99%

Section: Selection Of the Porous Media For Encapsulationmentioning

confidence: 99%

See 1 more Smart Citation

Development and Characterization of Concrete/PCM/Diatomite Composites for Thermal Energy Storage in CSP/CST Applications

Miliozzi

Dominici

Candelori³

et al. 2021

Energies

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“…Christensen et al [13] used amorphous silica known as kieselguhr or diatomite, which has a high amount of impurities such as Al 2 O 3 , MgO, and Fe 2 O 3 [19] . Usually, the studies related to the synthesis of rare earth silicates have in common the use of high-purity silica powders (>99.0%) [4,5,8,12,13,15,16,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

High-purity synthesis of La2SiO5 by solid-state reaction between La2O3 and different characteristics of SiO2

Arbelaez

Geffroy

Aimable

et al. 2020

Ceramics International

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The solid-state reaction between lanthanum oxide and different characteristics of silica has been investigated to define new process conditions that favor the formation of La 2 SiO 5 and to characterize the La 2 O 3 : SiO 2 reaction mechanisms. Silica with different crystalline structures (amorphous or quartz-type silica) and various average particle sizes of ~36, 12, 1, and 0.02 µm were used. The 1:1 M ratio mixtures between La 2 O 3 and different types of SiO 2 were ground and subsequently heated at 1200 and 1500°C for 10 h. The morphology of the ground mixtures, their thermal properties, and the phases obtained after heating were determined in this study. The phases identified after each solid-state synthesis were quantified using Rietveld refinements. The results obtained indicate that an amorphous silica with a small particle size (<1 µm) is more advantageous in the La 2 SiO 5 powder synthesis. An alternative synthesis method of using an amorphous colloidal silica with a particle size of 0.02 µm is proposed, and the purity level achieved at 1500°C after 10 h is higher than 90 vol%. A reaction mechanism was suggested that highlights the strong effect of the size ratio (La 2 O 3 /SiO 2 : 1 µm/0.02 µm) to improve the reactivity and La 2 SiO 5 phase formation.

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“…De los resultados simultáneo DSC -TGA, para MD3, se establece que cuando la temperatura se incrementa, se producen varios picos endotérmicos en la Figura 141, podemos apreciar4 picos, a 111,66°C, 504,15°C y a 763,91°C. El pico endotérmico centrado a 111,66°C, se causa por pérdida de agua, absorbida en la diatomita (Chaisena & Rangsriwatananon, 2004); el segundo pico endotérmico centrado a 504,15°C, es propio de la degradación de compuestos minerales, como el cuarzo y la eliminación de materia orgánica (Meradi et al, 2015).…”

Section: B) Análisis De Resistencia a La Compresión Diametral (Cd) Yunclassified

Ciencia e ingeniería de nuevos materiales en la fabricación de ladrillos mejorados tecnológicamente

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Characterization by Thermal Analysis of Natural Kieselguhr and Sand for Industrial Application

Cited by 25 publications

References 14 publications

Development and Characterization of Concrete/PCM/Diatomite Composites for Thermal Energy Storage in CSP/CST Applications

Development and Characterization of Concrete/PCM/Diatomite Composites for Thermal Energy Storage in CSP/CST Applications

High-purity synthesis of La2SiO5 by solid-state reaction between La2O3 and different characteristics of SiO2

Ciencia e ingeniería de nuevos materiales en la fabricación de ladrillos mejorados tecnológicamente

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