Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder: - Awarded as the Best Poster (1st Prize)

Research output: Contribution to conference without publisher/journalPosterResearch

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Abstract

Soda (Na2CO3) is one of the major raw materials for producing most of the daily used glasses. It often acts as effective fluxing agent in glass melting and foaming agent for producing lightweight glass materials due to its release of CO2 at elevated temperatures. When Na2CO3 is added to a batch prior to glass melting, the resulting decomposition product Na2O has strong impact on the melt viscosity, phase separation and crystallisation behaviour, and also mechanical properties of the final glass. This is relatively well understood in literature. In contrast, when Na2CO3 is added as a foaming agent together with glass cullet powder, the impact of the resulting Na2O on the glass structure at the foaming temperatures has not been well understood. Here, we show that Na2O can be readily incorporated into the network structure of the glass phase at temperatures much lower than normal batch melting temperatures. This is verified by a sharp decrease of the glass transition temperature (Tg) of the resulting foam glass when the foaming temperature is increased from 650 to 800 °C for various contents of Na2CO3 (up to 22 wt%). Upon further raising the foaming temperature, Tg reaches a plateau for lower Na2CO3 content, whereas it slightly increases again for the higher Na2CO3 due to possible crystallization. The sharp decrease in Tg implies that Na2CO3 reacts readily with the cullet powder at rather low temperatures. The released CO2 at an optimum temperature causes ideal foaming effect in the glass, making the studied cullet powder potentially suitable for producing insulation materials. Finally, we discuss these results based on supplementary x-ray diffraction and scanning electron microscopy analyses.
Original languageEnglish
Publication date27 May 2013
Publication statusPublished - 27 May 2013
Event87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG) - Germany, Bremen
Duration: 27 May 201329 May 2013

Conference

Conference87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG)
LocationGermany
CityBremen
Period27/05/201329/05/2013

Fingerprint

Powders
Glass
Blowing agents
Temperature
Melting
Crystallization
Phase separation
Melting point
Foams
Insulation
Raw materials
Diffraction
Viscosity
Decomposition
X rays
Mechanical properties
Scanning electron microscopy

Keywords

  • Foam glass
  • CRT panel glass
  • Glass sintering
  • MYEGA
  • Viscosity
  • Glass transition temperature

Cite this

Petersen, R. R., König, J., Smedskjær, M. M., & Yue, Y. (2013). Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder: - Awarded as the Best Poster (1st Prize). Poster presented at 87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG), Bremen, .
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title = "Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder: - Awarded as the Best Poster (1st Prize)",
abstract = "Soda (Na2CO3) is one of the major raw materials for producing most of the daily used glasses. It often acts as effective fluxing agent in glass melting and foaming agent for producing lightweight glass materials due to its release of CO2 at elevated temperatures. When Na2CO3 is added to a batch prior to glass melting, the resulting decomposition product Na2O has strong impact on the melt viscosity, phase separation and crystallisation behaviour, and also mechanical properties of the final glass. This is relatively well understood in literature. In contrast, when Na2CO3 is added as a foaming agent together with glass cullet powder, the impact of the resulting Na2O on the glass structure at the foaming temperatures has not been well understood. Here, we show that Na2O can be readily incorporated into the network structure of the glass phase at temperatures much lower than normal batch melting temperatures. This is verified by a sharp decrease of the glass transition temperature (Tg) of the resulting foam glass when the foaming temperature is increased from 650 to 800 °C for various contents of Na2CO3 (up to 22 wt{\%}). Upon further raising the foaming temperature, Tg reaches a plateau for lower Na2CO3 content, whereas it slightly increases again for the higher Na2CO3 due to possible crystallization. The sharp decrease in Tg implies that Na2CO3 reacts readily with the cullet powder at rather low temperatures. The released CO2 at an optimum temperature causes ideal foaming effect in the glass, making the studied cullet powder potentially suitable for producing insulation materials. Finally, we discuss these results based on supplementary x-ray diffraction and scanning electron microscopy analyses.",
keywords = "Foam glass, CRT panel glass, Glass sintering, MYEGA, Viscosity, Glass transition temperature",
author = "Petersen, {Rasmus Rosenlund} and Jakob K{\"o}nig and Smedskj{\ae}r, {Morten Mattrup} and Yuanzheng Yue",
year = "2013",
month = "5",
day = "27",
language = "English",
note = "87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG) ; Conference date: 27-05-2013 Through 29-05-2013",

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Petersen, RR, König, J, Smedskjær, MM & Yue, Y 2013, 'Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder: - Awarded as the Best Poster (1st Prize)', 87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG), Bremen, 27/05/2013 - 29/05/2013.

Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder : - Awarded as the Best Poster (1st Prize). / Petersen, Rasmus Rosenlund; König, Jakob; Smedskjær, Morten Mattrup; Yue, Yuanzheng.

2013. Poster presented at 87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG), Bremen, .

Research output: Contribution to conference without publisher/journalPosterResearch

TY - CONF

T1 - Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder

T2 - - Awarded as the Best Poster (1st Prize)

AU - Petersen, Rasmus Rosenlund

AU - König, Jakob

AU - Smedskjær, Morten Mattrup

AU - Yue, Yuanzheng

PY - 2013/5/27

Y1 - 2013/5/27

N2 - Soda (Na2CO3) is one of the major raw materials for producing most of the daily used glasses. It often acts as effective fluxing agent in glass melting and foaming agent for producing lightweight glass materials due to its release of CO2 at elevated temperatures. When Na2CO3 is added to a batch prior to glass melting, the resulting decomposition product Na2O has strong impact on the melt viscosity, phase separation and crystallisation behaviour, and also mechanical properties of the final glass. This is relatively well understood in literature. In contrast, when Na2CO3 is added as a foaming agent together with glass cullet powder, the impact of the resulting Na2O on the glass structure at the foaming temperatures has not been well understood. Here, we show that Na2O can be readily incorporated into the network structure of the glass phase at temperatures much lower than normal batch melting temperatures. This is verified by a sharp decrease of the glass transition temperature (Tg) of the resulting foam glass when the foaming temperature is increased from 650 to 800 °C for various contents of Na2CO3 (up to 22 wt%). Upon further raising the foaming temperature, Tg reaches a plateau for lower Na2CO3 content, whereas it slightly increases again for the higher Na2CO3 due to possible crystallization. The sharp decrease in Tg implies that Na2CO3 reacts readily with the cullet powder at rather low temperatures. The released CO2 at an optimum temperature causes ideal foaming effect in the glass, making the studied cullet powder potentially suitable for producing insulation materials. Finally, we discuss these results based on supplementary x-ray diffraction and scanning electron microscopy analyses.

AB - Soda (Na2CO3) is one of the major raw materials for producing most of the daily used glasses. It often acts as effective fluxing agent in glass melting and foaming agent for producing lightweight glass materials due to its release of CO2 at elevated temperatures. When Na2CO3 is added to a batch prior to glass melting, the resulting decomposition product Na2O has strong impact on the melt viscosity, phase separation and crystallisation behaviour, and also mechanical properties of the final glass. This is relatively well understood in literature. In contrast, when Na2CO3 is added as a foaming agent together with glass cullet powder, the impact of the resulting Na2O on the glass structure at the foaming temperatures has not been well understood. Here, we show that Na2O can be readily incorporated into the network structure of the glass phase at temperatures much lower than normal batch melting temperatures. This is verified by a sharp decrease of the glass transition temperature (Tg) of the resulting foam glass when the foaming temperature is increased from 650 to 800 °C for various contents of Na2CO3 (up to 22 wt%). Upon further raising the foaming temperature, Tg reaches a plateau for lower Na2CO3 content, whereas it slightly increases again for the higher Na2CO3 due to possible crystallization. The sharp decrease in Tg implies that Na2CO3 reacts readily with the cullet powder at rather low temperatures. The released CO2 at an optimum temperature causes ideal foaming effect in the glass, making the studied cullet powder potentially suitable for producing insulation materials. Finally, we discuss these results based on supplementary x-ray diffraction and scanning electron microscopy analyses.

KW - Foam glass

KW - CRT panel glass

KW - Glass sintering

KW - MYEGA

KW - Viscosity

KW - Glass transition temperature

M3 - Poster

ER -

Petersen RR, König J, Smedskjær MM, Yue Y. Insights into Reaction Mechanism of Na2CO3 in Foaming Process of Cullet Powder: - Awarded as the Best Poster (1st Prize). 2013. Poster presented at 87. Glastechnische Tagung der Deutschen Glastechnischen Gesellschaft (DGG), Bremen, .