Optimization of porous heat-insulating ceramics manufacturing from zeolitic rocks

Kazantseva, L. K.; Rashchenko, Sergey V.

doi:10.1016/j.ceramint.2016.09.091

Cited by 21 publications

(4 citation statements)

References 8 publications

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“…At present, the preparation methods of the porous ceramics are commonly used: pore-forming agent method, foaming method, extrusion molding method, organic foam impregnation method, and particle accumulation method (Alves Xavier et al 2019;Kazantseva and Rashchenko 2016). Generally, different preparation methods and conditions of porous ceramics have a significant effect on their properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and flow characteristics of dolomite-based porous supports for catalysts using different pore-forming agents

Wei

Liu

et al. 2022

BioRes

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Three kinds of pore-forming agents (corn flour, starch, and biochar) were selected to prepare dolomite-based porous ceramic catalyst carriers with good mechanical properties. Pore-forming agents occupy space within preformed agglomerates, such that after the pyrolysis and sintering have been completed there are spaces within the resulting ceramic material. Porous ceramic samples prepared with biochar exhibited high apparent porosity and water absorption. By contrast, the apparent porosity of the porous ceramic samples prepared with starch as the pore-forming agent was low. When the ratio of the dolomite to quartz sand in the ceramic aggregate was changed from 4:6 to 3:7, the change of the apparent porosity of the porous ceramic samples made with starch as a pore-forming agent was very small, with high bulk density and compressive strength. Compared with corn flour and biochar, starch was less suitable as a pore-forming agent for porous ceramics. The apparent porosity and water absorption of the porous ceramics prepared with biochar as a pore-forming agent decreased slightly. But its bulk density and thermal conductivity were increased. This is mainly attributable to the fact that biochar is lighter, but it performs well in terms of mechanical strength and thermal conductivity.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and flow characteristics of dolomite-based porous supports for catalysts using different pore-forming agents

Wei

Liu

et al. 2022

BioRes

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“…However, manufacturing glass-ceramic foams from primary glass is a highly expensive operation since multiple heating periods are necessary in this case: Firstly, sintering at 1,450-1,500 8C is required to produce primary glass. Secondly, the glass and foaming agent mixture is sintered at 800-900 8C to achieve the desired cellular structure [13,14]. Therefore, the manufacturing of new eco-friendly glass-ceramic foams that are both highly effective and low-cost is gaining a lot of attention lately.…”

Section: Introductionmentioning

confidence: 99%

Glass-ceramic foams produced from zeolite-poor rock (Tokaj)

Ibrahim

Tihtih

Kurovics

et al. 2022

Pollack

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This study evaluated the possibility of producing innovative glass-ceramic foams from zeolite-poor rock (Tokaj, Hungary) using alkali-activation and reactive sintering techniques. The composition and morphology of the samples were studied using X-ray diffraction, X-ray fluorescence, scanning electron microscope, and computed tomography techniques. The influence of various sintering temperatures on glass-ceramic foams was examined. It has been observed that zeolite-poor rock has a self-foaming capability. The heat treatment temperature affects the pore size and distribution as well as the technical characteristics of the obtained samples. The resulting glass-ceramic foams possess moderate thermal conductivity ranging from 0.11 to 0.17 W mK−1 and good compressive strength (1.5–4.4 MPa). The produced samples might be utilized for thermal insulation, which would have both economic and environmental advantages.

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“…Such raw materials include, in particular, sewage sludge from municipal wastewater treatment plants, different coal fly ashes, and some others [1][2][3][4]. The technology of "hydrate" foaming is based on the dehydration of alkaline hydro-silicates (either formed by the interaction of NaOH with silicate raw materials or specially introduced into the mixture in the form of waterglass) and foaming of the silicate mass by the released water vapor [5][6][7][8][9][10][11][12][13]. Both of these mechanisms are currently used in laboratory studies and have not been implemented in real production.…”

Section: Introductionmentioning

confidence: 99%

Role of Carbon Phase in the Formation of Foam Glass Porous Structure

Гольцман

Yatsenko

2022

Materials

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The production of durable, non-combustible, heat-insulating materials is currently very important. One of the most promising materials is foam glass. Modern enterprises widely use organic foaming agents in foam glass production. The purpose of this work is to study the role of the carbon phase formed during the organic foaming agent’s (glycerol) thermal destruction in the processes of glass mass foaming. The samples were synthesized using the powder method with high-temperature treatment. Different ratios of glycerol and waterglass in a foaming mixture showed that amount of glycerol should be less than in waterglass. Otherwise, the amount is excessive and the glycerol burns out. It was shown that the quantitative description of the carbon phase structure and properties is complicated by its nanometer size and fusion into the glass. Theoretical calculations demonstrate that carbon particle size cannot be greater than 535 nm. Using a set of methods, it was proved that the carbon phase is represented by nanometer particles of amorphous sp2-carbon. Therefore, the foaming mechanism includes nanoparticles settling and immersing into the glass surface, a reaction of carbon with the sulfate ions from glass with a release of gases. Conclusions on foaming intensification via using sulfur additions and other organic foaming agents were drawn.

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Optimization of porous heat-insulating ceramics manufacturing from zeolitic rocks

Cited by 21 publications

References 8 publications

Mechanical properties and flow characteristics of dolomite-based porous supports for catalysts using different pore-forming agents

Mechanical properties and flow characteristics of dolomite-based porous supports for catalysts using different pore-forming agents

Glass-ceramic foams produced from zeolite-poor rock (Tokaj)

Role of Carbon Phase in the Formation of Foam Glass Porous Structure

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