Effect of Clarifying Agent on Melting Process of Heat-Resistant Glass from Waste TFT-LCD Glass

Abstract

Abstract: A new type of heat-resistant borosilicate glass was designed based on waste TFT-LCD glass raw materials. Aiming at the difficulty in clarification of the heat-resistant glass, which leads to a large amount of bubbles in the glass, the effects of four clarifying agents: CeO₂, NaCl, Na₂SO₄ and SnO₂ on the clarification quality of the heat-resistant glass were studied by high temperature video research method of glass batch. The experiment observed the clarification process of glass melt through a high-temperature video system. The results show that at the melting temperature of 1 600 ℃, the best clarification effect is achieved when the addition amount of NaCl and Na₂SO₄ were added as a single clarifying agent at 0.50% (mass fraction) and 0.20% (mass fraction), respectively. The best clarification effect is achieved when the addition amount of clarifying agent combining CeO₂ and SnO₂ with NaNO₃ is 0.40% (mass fraction) CeO₂+2.60% (mass fraction) NaNO₃ and 0.40% (mass fraction) SnO₂+2.40% (mass fraction) NaNO₃. The time for the glass melt foam to start falling back is 22, 10, 20 and 28 min, respectively. The initial falling temperatures are 1 110, 1 050, 1 103 and 1 143 ℃, respectively. Under the optimum holding time, the clarification effect is best with 0.50% (mass fraction) NaCl.

Key words: waste TFT-LCD glass, novel heat-resistant borosilicate glass, high temperature video, clarifying agent, bubble defect, bubble elimination

CLC Number:

TQ171.1

TIAN Yingliang, YUAN Zhichun, XU Bo, MU Guanghan, ZHAO Zhiyong. Effect of Clarifying Agent on Melting Process of Heat-Resistant Glass from Waste TFT-LCD Glass[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2928-2935.

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