Method for producing molten glass and method for producing glass article
A technology of molten glass and manufacturing method, which is applied in the manufacture of aluminosilicate glass and the manufacture of glass objects, to achieve the effects of reducing melting delay, reducing manufacturing, and excellent homogeneity
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[0120] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.
[0121]
[0122] The particle size distribution was measured by wet laser diffraction using a laser diffraction / scattering particle size distribution measuring device (manufactured by Horiba, Ltd., product name: LA-950), and D10, D50, or D90 was determined. When the particles are aggregated in the dispersion medium, the aggregates are dispersed by ultrasonic waves, and the particle size distribution of the primary particles constituting the aggregates is measured.
[0123]
[0124] Silica sand, alumina, an alkali metal source, and other raw materials are adjusted so that alkali-aluminosilicate glass of a predetermined glass composition is obtained to form a glass raw material composition.
[0125] The prepared glass raw material composition and cullet were mixed at a predetermined ratio, put into a crucible, and melted in the crucible. Measure t...
example 1～5
[0149] Examples 1 and 2 are examples, and examples 3 to 5 are comparative examples. Silica sand, alumina, an alkali metal source, a magnesium source, and a clarifying agent shown in Table 3 were adjusted so as to become the following glass composition (i) to prepare a glass raw material composition. The addition amount of the clarifying agent was 1.4 mol% with respect to a glass raw material composition.
[0150] The temperature at the bottom of the crucible, the thickness of the floating matter layer, and the number of bubbles were measured for the glass raw material compositions of each example by the above-mentioned method. The mass ratio of glass raw material composition: cullet was 50:50. The results are shown in Table 3.
[0151]
[0152] SiO 2 : 68.0 mol%, Al 2 o 3 : 10.0 mol%, MgO: 8.0 mol%, Na 2 O: 14.0 mol%. SiO 2 / Al 2 o 3 The molar ratio is 6.8.
[0153] [table 3]
[0154]
[0155] According to the results in Table 3, use alumina U with a D90 of 20...
example 6～9
[0157] Examples 6-8 are examples, and Example 9 is a comparative example. Silica sand, alumina, an alkali metal source, a magnesium source, and a clarifier shown in Table 4 were adjusted so as to become the above-mentioned glass composition (i) to prepare a glass raw material composition. The addition amount of clarifying agent is identical with example 1.
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Abstract
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