Foaming of CRT panel glass powder with Na2CO3

Research output: Contribution to conference without publisher/journalPosterResearch

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Abstract

Recycling of cathode ray tube (CRT) glass remains a challenging task. The CRT glass consists of four glass types fused together: Funnel-, neck-, frit- and panel glass. The three former glasses contain toxic lead oxide, and therefore have a low recycling potential. The latter on the other hand is lead-free, but since barium and strontium oxide are present, panel glass is incompatible with most common recycling methods. However, foam glass production is a promising approach for the recycling of panel glass waste, since the process parameters can be changed according to the glass waste composition in question. In this work, we foam panel glass cullet using sodium carbonate (Na2CO3) as a foaming agent, and study the foaming mechanism. When heat treating Na2CO3 powder with cullet powder, Na2CO3 reacts with the glass melt and is decomposed into Na2O and CO2. The released CO2 foams the glass melt, while Na2O becomes incorporated into the glass structure. We have quantified the melt expansion through density measurements and the Na2O incorporation is indicated by the decrease of the glass transition temperature (Tg) of the final foam glass. The glass foaming quality depends on the foaming temperature (i.e., the melt viscosity) and the concentration of Na2CO3. We reveal the origin of these dependencies.
Original languageEnglish
Publication date2013
Publication statusPublished - 2013
EventInternational Conference on Glass - Czech Republic, Prauge
Duration: 1 Jul 20135 Jul 2013

Conference

ConferenceInternational Conference on Glass
LocationCzech Republic
CityPrauge
Period01/07/201305/07/2013

Fingerprint

Cathode ray tubes
Powders
Glass
Foams
Recycling
Lead oxide
Blowing agents
Strontium
Barium
Carbonates

Keywords

  • Foam glass
  • CRT panel glass
  • Glass cullet
  • Glass sintering

Cite this

Petersen, R. R., König, J., Smedskjær, M. M., & Yue, Y. (2013). Foaming of CRT panel glass powder with Na2CO3. Poster presented at International Conference on Glass, Prauge, .
Petersen, Rasmus Rosenlund ; König, Jakob ; Smedskjær, Morten Mattrup ; Yue, Yuanzheng. / Foaming of CRT panel glass powder with Na2CO3. Poster presented at International Conference on Glass, Prauge, .
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title = "Foaming of CRT panel glass powder with Na2CO3",
abstract = "Recycling of cathode ray tube (CRT) glass remains a challenging task. The CRT glass consists of four glass types fused together: Funnel-, neck-, frit- and panel glass. The three former glasses contain toxic lead oxide, and therefore have a low recycling potential. The latter on the other hand is lead-free, but since barium and strontium oxide are present, panel glass is incompatible with most common recycling methods. However, foam glass production is a promising approach for the recycling of panel glass waste, since the process parameters can be changed according to the glass waste composition in question. In this work, we foam panel glass cullet using sodium carbonate (Na2CO3) as a foaming agent, and study the foaming mechanism. When heat treating Na2CO3 powder with cullet powder, Na2CO3 reacts with the glass melt and is decomposed into Na2O and CO2. The released CO2 foams the glass melt, while Na2O becomes incorporated into the glass structure. We have quantified the melt expansion through density measurements and the Na2O incorporation is indicated by the decrease of the glass transition temperature (Tg) of the final foam glass. The glass foaming quality depends on the foaming temperature (i.e., the melt viscosity) and the concentration of Na2CO3. We reveal the origin of these dependencies.",
keywords = "Foam glass, CRT panel glass, Glass cullet, Glass sintering",
author = "Petersen, {Rasmus Rosenlund} and Jakob K{\"o}nig and Smedskj{\ae}r, {Morten Mattrup} and Yuanzheng Yue",
year = "2013",
language = "English",
note = "International Conference on Glass, ICG Conference ; Conference date: 01-07-2013 Through 05-07-2013",

}

Petersen, RR, König, J, Smedskjær, MM & Yue, Y 2013, 'Foaming of CRT panel glass powder with Na2CO3', International Conference on Glass, Prauge, 01/07/2013 - 05/07/2013.

Foaming of CRT panel glass powder with Na2CO3. / Petersen, Rasmus Rosenlund; König, Jakob; Smedskjær, Morten Mattrup; Yue, Yuanzheng.

2013. Poster presented at International Conference on Glass, Prauge, .

Research output: Contribution to conference without publisher/journalPosterResearch

TY - CONF

T1 - Foaming of CRT panel glass powder with Na2CO3

AU - Petersen, Rasmus Rosenlund

AU - König, Jakob

AU - Smedskjær, Morten Mattrup

AU - Yue, Yuanzheng

PY - 2013

Y1 - 2013

N2 - Recycling of cathode ray tube (CRT) glass remains a challenging task. The CRT glass consists of four glass types fused together: Funnel-, neck-, frit- and panel glass. The three former glasses contain toxic lead oxide, and therefore have a low recycling potential. The latter on the other hand is lead-free, but since barium and strontium oxide are present, panel glass is incompatible with most common recycling methods. However, foam glass production is a promising approach for the recycling of panel glass waste, since the process parameters can be changed according to the glass waste composition in question. In this work, we foam panel glass cullet using sodium carbonate (Na2CO3) as a foaming agent, and study the foaming mechanism. When heat treating Na2CO3 powder with cullet powder, Na2CO3 reacts with the glass melt and is decomposed into Na2O and CO2. The released CO2 foams the glass melt, while Na2O becomes incorporated into the glass structure. We have quantified the melt expansion through density measurements and the Na2O incorporation is indicated by the decrease of the glass transition temperature (Tg) of the final foam glass. The glass foaming quality depends on the foaming temperature (i.e., the melt viscosity) and the concentration of Na2CO3. We reveal the origin of these dependencies.

AB - Recycling of cathode ray tube (CRT) glass remains a challenging task. The CRT glass consists of four glass types fused together: Funnel-, neck-, frit- and panel glass. The three former glasses contain toxic lead oxide, and therefore have a low recycling potential. The latter on the other hand is lead-free, but since barium and strontium oxide are present, panel glass is incompatible with most common recycling methods. However, foam glass production is a promising approach for the recycling of panel glass waste, since the process parameters can be changed according to the glass waste composition in question. In this work, we foam panel glass cullet using sodium carbonate (Na2CO3) as a foaming agent, and study the foaming mechanism. When heat treating Na2CO3 powder with cullet powder, Na2CO3 reacts with the glass melt and is decomposed into Na2O and CO2. The released CO2 foams the glass melt, while Na2O becomes incorporated into the glass structure. We have quantified the melt expansion through density measurements and the Na2O incorporation is indicated by the decrease of the glass transition temperature (Tg) of the final foam glass. The glass foaming quality depends on the foaming temperature (i.e., the melt viscosity) and the concentration of Na2CO3. We reveal the origin of these dependencies.

KW - Foam glass

KW - CRT panel glass

KW - Glass cullet

KW - Glass sintering

M3 - Poster

ER -

Petersen RR, König J, Smedskjær MM, Yue Y. Foaming of CRT panel glass powder with Na2CO3. 2013. Poster presented at International Conference on Glass, Prauge, .