| 1. |
- Grund Bäck, Lina, 1974-, et al.
(författare)
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The influence of basicity on oxygen activity and antimony oxide fining efficiency in alkali alkaline earth aluminosilicate glasses
- 2009
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Ingår i: European Journal of Glass Science and Technology. Part A: Glass Technology. - Sheffield : Society of Glass Technology. - 1753-3546 .- 1753-3554. ; 50:5, s. 241-246
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Tidskriftsartikel (refereegranskat)abstract
- The number of bubbles was monitored in antimony oxide fined R2O-MxOy-SiO2 and R2O-CaO-Al2O3-SiO2 glasses (R = Na, K; M = Ca, Mg, Ba, Sr, Zn, B, Al, Ti, x = 1 or 2, y = 1, 2 or 3) in order to evaluate the fining efficiency. Electrochemical measurements of oxygen activity were used to, in situ, monitor the fining characteristics and conditions in some of the investigated glass melts. The results showed that an increase of the calculated optical basicity was related to an increased number of bubbles in the glass samples. The oxygen activity in the melt during fining decreased with increased optical basicity.
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| 2. |
- Grund, Lina, et al.
(författare)
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Compositional effect on fining and oxygen activity in mixed alkali silicate glasses
- 2009
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Ingår i: European Journal of Glass Science and Technology. Part A: Glass Technology. - : Society of Glass Technology. - 1753-3546. ; 50:1, s. 62-64
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Tidskriftsartikel (refereegranskat)abstract
- This study monitors, in situ, how alterations of the glass composition affect the results of fining and the oxygen activity (aO2) of the melt. The number of bubbles in annealed glass samples was determined in order to evaluate the fining efficiency. Electrochemical measurement of aO2 was used to monitor in situ the fining charcteristics and conditions of Na2O-K2O-CaO-SiO2 glasses. The glasses investigated had a constant alkali oxide content, but a varying ratio of Na2O/(Na2O+K2O). The Sb2O3 content was o.2 mole-% and NaNO3 or KNO3 was added as oxidising agent in most of the glasses. The results show that the number of bubbles decreases from approximately 1100 to 200 bubbles/ 100 g glass and that aO2 at 1400 deg C increases from 0.2 to 1.2 bar in the glass melt when increasing the Na2O/(Na2O+K2O) ratio from 0 to 1.
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| 3. |
- Jonson, Bo, 1958-, et al.
(författare)
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A CIELAB approach facilitating glass decolourising and recycling of coloured cullet
- 2009
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Ingår i: European Journal of Glass Science and Technology. Part A: Glass Technology. - Sheffield : Society of Glass Technology. - 1753-3546. ; 50:2, s. 89-94
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Tidskriftsartikel (refereegranskat)abstract
- The CIELAB coordinate has demonstrated as useful for description of the colour characteristics of decolourised flint glass. The amounts of cobalt and erbium oxides necessary for sufficient decolourising of additions of coloured cullet can be calculated from the appearant linear dependence of CIE a* and b* coordinates to the added amounts of cobalt and erbium oxides to the batch. For the sucess of such a calculation, the colour point of the added cullet must be determined.
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