The Effect of Melting at Low Temperature on the Quality of Glass

低温熔化对玻璃质量的影响

• 批准号: 11650856
• 负责人: YANO Tetsuji
• 金额: $ 1.98万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650856/
• 关键词: Glass melting; Socla-lime silica glass; DCEC; Bubble; Fining; Decoloration; 気泡

This work has been done for the investigation of the effect of the melting at low temperature on the quality of glass. The low temperature process has been desired in order to save the energy for the fabrication of the glass products, and also to suppress the emission of carbon dioxide produced by the combustion of fossil fuels to attain high temperature condition in the melting tank. However, low temperature melting causes the depression of fining effect of the glass melts, resulting the glass containing a large amount of bubbles inside.In this study, the direct current electrochemical treatment (DCEC) has been applied on the glass melts at 1200-1300℃, which is 200℃ lower than the melting temperature, and the effect on the fining of the glass has been investigated. The application of 1.35DCV on soda-lime-silica glass melt through the Pt electrodes caused the continuous formation of bubbles with a large mean diameter about 1mm on anode. The bubbles ascended at a high speed about 1mm/min, and form the bubble layer on the melt surface. They also induced the convection in the melts. DCEC on the glass melts containing a large amount of fine bubbles (diameter<0.5mm) decreased the bubbles in the glass mostly within 1h-treatment, while the melting without DCEC could not remove the bubbles at all. DCEC was also found to have the effect of the redox control of transition metal ions in the melts. It could decolorize the glass effectively clue to the shift of the redox of metal ions, Fe^<2+> →Fe^<3+>, From these results, DCEC treatment was considered to be a promising new process solving the problems which are caused by the lowering of the melting temperature.

这项工作是为了研究低温熔化对玻璃质量的影响。为了节省玻璃制品制造的能源，并抑制化石燃料燃烧产生的二氧化碳排放，以在熔化槽中达到高温条件，需要低温工艺。然而，低温熔化导致玻璃熔体的澄清效果下降，导致玻璃内部含有大量气泡。本研究在比熔化温度低200℃的1200-1300℃对玻璃熔体进行直流电化学处理（DCEC），并研究了其对玻璃澄清的影响。通过 Pt 电极对钠钙硅玻璃熔体施加 1.35DCV 导致阳极上连续形成平均直径约为 1mm 的大气泡。气泡以约1mm/min的高速上升，并在熔体表面形成气泡层。他们还引发了熔体中的对流。 DCEC对含有大量细小气泡(直径<0.5mm)的玻璃熔体在1h处理内大部分减少了玻璃中的气泡，而没有DCEC的熔化根本不能去除气泡。 DCEC还被发现具有控制熔体中过渡金属离子的氧化还原作用。它可以通过金属离子氧化还原位移Fe^<2+>→Fe^<3+>有效地对玻璃进行脱色，从这些结果来看，DCEC处理被认为是解决由于熔化温度降低而引起的问题的一种有前途的新工艺。