Silica sand grain graduation non-alkali glass batch

Abstract

The invention relates to a silica sand grain graduation non-alkali glass batch which comprises the following ingredients in percentage by mass: 59% of SiO2, 17% of Al2O3, 0.2% of ZrO2, 5% of CaO, 7% of B2O2, 3% of MgO, 6.55% of SrO, 1.8% of P2O5, 0.15% of SnO, 0.15% of MoO3 and 0.15% of WO3. The batch is characterized in that silica sand grains in grain sizes of greater than 0.15 mm, 0.075-0.15 mm, 0.045-0.75 mm and less than 0.045 mm account for 1.0%, 80.0%, 14.0% and 5.0% of the weight of total silica sand respectively. The batch has the benefits that high quality non-alkali glass with a small residual bubble quantity, small bubble diameter and good homogeneity is obtained through silica sand grain graduation and an optimized proportion of the silica sand grain sizes; the cost is effectively reduced through the silica sand grain graduation; a technology is simple.

Description

technical field

[0001] The invention belongs to the field of flexible glass production, and relates to the production of non-alkali glass, in particular to a non-alkali glass batch material with silica sand particle size distribution. Background technique

[0002] Alkali-free glass is often required for glass substrates for displays such as liquid crystal display devices. Since the glass raw material of alkali-free glass does not contain alkali metal compounds substantially, and the content of alumina is high, the glass melting process is much more difficult than conventional soda lime silicate glass.

[0003] As the most important raw material of glass, silica sand accounts for the largest proportion and has the greatest impact. The melting time of silica sand is proportional to its particle size. The larger the particle size, the more difficult it is to melt. In order to reduce the melting time, the particle size of silica sand should be reduced. At present, silica sand p...

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