Effect of Na2CO3 content on thermal properties of foam-glass ceramics prepared from smelting slag

Niu, Yonghong; Fan, Xingwang; Ren, Da; Wang, Wencai; Li, Yike; Zhang, Yang; Cui, Lingxiao

doi:10.1016/j.matchemphys.2020.123610

Cited by 28 publications

(6 citation statements)

References 11 publications

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“…Additionally, we introduced Na 3 PO 4 ·12H 2 O (purity ≥98.0%, AR) as a foam stabilizer, which underwent decomposition to yield Na + and [PO 4 ] tetrahedrons. The presence of Na + effectively weakened the strong covalent Si–O bonds in the silicate glass, reducing the softening temperature and viscosity 13,18,19 . Simultaneously, the [PO 4 ] tetrahedron acted as a network modifier, enhancing the elasticity of liquid films and effectively impeding the escape or merging of formed bubbles 20 .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer

Zhou,

Feng,

Sun

2024

J Am Ceram Soc.

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We report the effects of sodium phosphate dodecahydrate (Na3PO4·12H2O) as a foam stabilizer on the crystalline phases, microstructure, and properties of foamed glass–ceramics derived from solid industrial wastes. Our findings reveal that Na3PO4·12H2O acts as a pore structure stabilizer, enhancing pore uniformity by releasing P2O5 during decomposition. Additionally, it lowers the softening temperature and viscosity by supplying Na2O. X‐ray diffraction analysis demonstrates that Na3PO4·12H2O does not alter the primary crystal types but does influence the crystallinity and morphology. With an increase in Na3PO4·12H2O content, the porosity and water absorption improve, but the bulk density, thermal conductivity, and compressive strength decrease. The optimal properties are achieved with 4 wt% Na3PO4·12H2O, resulting in significantly higher compressive strength compared to foamed glass–ceramics prepared from other solid wastes. This study provides valuable guidelines for effectively reusing solid industrial wastes to fabricate foamed glass–ceramics.

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Section: Methodsmentioning

confidence: 99%

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer

Zhou,

Feng,

Sun

2024

J Am Ceram Soc.

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“…‐ 23 For example, the waste glass with high Si/Al silicate material could be used to reduce the melting point temperature of the formed solids 24,25 . The sodium element in albite (Na 2 O·Al 2 O 3 ·6SiO 2 ) facilitates the conversion of Al3+ from octahedral to tetrahedral in the sample, allowing the eutectic melting at low temperatures, and thus reducing the viscosity of the liquid phase 26 . Talc assists in volume expansion to counteract the sintering shrinkage, which could be used to reduce the apparent density of the sample 27,28 .…”

Section: Introductionmentioning

confidence: 99%

“…24,25 The sodium element in albite (Na 2 O⋅Al 2 O 3 ⋅6SiO 2 ) facilitates the conversion of Al3+ from octahedral to tetrahedral in the sample, allowing the eutectic melting at low temperatures, and thus reducing the viscosity of the liquid phase. 26 Talc assists in volume expansion to counteract the sintering shrinkage, which could be used to reduce the apparent density of the sample. 27,28 While the CaMg(CO3)2 in dolomite could promote the foaming and accelerate the destruction of the silica-oxygen tetrahedral network structure, thereby reducing the viscosity.…”

Section: Introductionmentioning

confidence: 99%

Coal gangue‐based ceramics foams by water spray granulation and post particle stacking method

Dai,

Zhang,

Meng

et al. 2024

Int J Applied Ceramic Tech

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Foamed ceramics were prepared by the water spray granulation and post particle stacking method using coal gangue as the main raw material. The effects of raw material weight ratio (i.e., raw material composition by varying the content of dolomite and talc), calcination temperature, time, and heating rate on the pore structure and properties of the samples were investigated and the foaming mechanism of foamed ceramics was revealed. The crystalline phase of foamed ceramics mainly consisted of quartz, anorthite, and enstatite. The decrease of dolomite content and the increase of talc content in the raw materials led to the initial decrease and then increase of the pore size dispersion coefficient, while the apparent porosity and water absorption of the samples gradually decreased, and the apparent density increased. The sample with a composition of gangue:waste glass:dolomite:albite:talc of 65:5:10:10:10 and calcined at 1200°C for 10 min with a heating rate of 1°C/min has the optimized uniform pore structure. This study provides a high value‐added utilization of coal gangue, and the experimental basis for the preparation of low‐cost foamed ceramics.

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“…The technology of granulated glass-ceramic foam materials from silica industrial waste is actively developing [46,47]. To obtain aggregates, ash from coal combustion is used [48,49], associated materials from the extraction and processing of ores and fuel, and metallurgical slags [50][51][52][53][54][55][56]. A number of developments are devoted to highly porous granular materials based on thermal foaming of liquid glass [57].…”

Section: Introductionmentioning

confidence: 99%

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

2021

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The article is devoted to the development of resource-saving technology of porous granular materials for energy-efficient construction. The relevance of the work for international research is to emphasize expanding the raw material base of porous lightweight concrete aggregates at the expense of technogenic and substandard materials. The work aims to study the processes of porization of glass crystalline granules from polymineral raw materials mixtures. The novelty of the work lies in the establishment of regularities of thermal foaming of glass crystalline granules when using waste of magnetic separation of skarn-magnetite (WMS) ores and lignite clay. Studies of liquid glass mixtures with various mineral fillers revealed the possibility of the formation of a porous structure with the participation of opoka, WMS and lignite clay. This is due to the presence in the materials of substances that exhibit thermal activity with the release of a gas phase. The foaming efficiency of the investigated materials increases when combined with glass breakage. The addition of WMS and lignite clay to the glass mixture increases the pore size in comparison with foam glass. The influence of the composition of raw mixtures on the molding and stability of granules is determined. The addition of sodium carbonate helps to strengthen the raw granules and reduce the softening temperature of the mass. The composition of the molding mixture of glass breakage, liquid glass and a multicomponent additive is developed, which provides an improvement in the molding properties of the glass mass, foaming of granules at a temperature of 750 °C. Foam glass crystalline granules have polymodal porosity, characterized by a density of 330–350 kg/m3, a compressive strength of 3.2–3.7 MPa, and a thermal conductivity of 0.057–0.061 W/(m·°C). Accordingly, the developed granules have a high potential use in structural and heat-insulating concretes.

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Effect of Na2CO3 content on thermal properties of foam-glass ceramics prepared from smelting slag

Cited by 28 publications

References 11 publications

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer

Coal gangue‐based ceramics foams by water spray granulation and post particle stacking method

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

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Effect of Na2CO3 content on thermal properties of foam-glass ceramics prepared from smelting slag

Cited by 28 publications

References 11 publications

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na3PO4·12H2O as a foam stabilizer

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na3PO4·12H2O as a foam stabilizer

Coal gangue‐based ceramics foams by water spray granulation and post particle stacking method

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

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Product

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Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer

Synthesis of foamed glass–ceramics from high‐titanium blast furnace slag using Na₃PO₄·12H₂O as a foam stabilizer