Nitrate-free method for manufacturing a blue glass composition

Details Nitrate-free method for manufacturing a blue glass composition Nitrate-free method for manufacturing a blue glass composition

1997-07-11

1998-09-15

Chin, Peter

Glass manufacturing

Processes

Fining or homogenizing molten glass

65 992, 501 71, 501900, 501904, 501905, C03B 516, C03B 1300, C03B 1802

Patent

active

058074171

ABSTRACT:
The invention is nitrate-free method to manufacture a blue soda-lime-silica glass composition and improving the ultraviolet light absorption thereof while maintaining a high visible light transmission. The method comprises the steps of: adding colorants, during molten glass formation, consisting essentially of a manganese compound along with a cobalt compound, iron oxide and optionally titanium oxide to a soda-lime-silica base glass composition, and adding no sodium nitrate into the batch during molten glass formation, the materials are adding in quantities sufficient to form said blue glass composition having at a 4.0 mm. thickness: 477-494 dominant wavelength and 6-40% purity of excitation. The blue glass composition, by weight, comprises a base glass composition of: 68 to 75% SiO.sub.2, 10 to 18% Na.sub.2 O, 5 to 15% CaO, 0 to 10% MgO, 0 to 5% Al.sub.2 O.sub.3, and 0 to 5% K.sub.2 O, where CaO+MgO is 6 to 15% and Na.sub.2 O+K.sub.2 O is 10 to 20%; and colorants consisting essentially of: 0.4 to 2.0% total iron oxide as Fe.sub.2 O.sub.3, 0.15 to 2.00% manganese oxide as MnO.sub.2 ; 0.005 to 0.025% cobalt oxide as Co, and 0 to 1.00% titanium oxide as TiO.sub.2. The glass is useful for automotive or architectural applications. The method preferably involves the use of a reducing agent like anthracite coal during melting operations.

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