Glass manufacturing – Processes
Patent
1993-03-29
1995-01-31
Jones, W. Gary
Glass manufacturing
Processes
65DIG11, 651343, 501 27, 501 32, 501 55, 501 72, C03B 100, C03C 600, C03C 100, C03C 3076
Patent
active
053855930
ABSTRACT:
The present invention provides a glass forming composition for encapsulating selenium which includes, by weight percent of raw materials, 20 to 50% silica and 50 to 80% alkali and alkaline earth materials. The composition has a liquidus temperature between 600.degree. to 1200.degree. C., preferably up to 1000.degree. C., and a viscosity up to 10,000 Poise at said liquidus temperature, preferably up to 5,000 Poise. The alkali and alkaline materials preferably include at least one group of materials combined in an approximate eutectic molar ratio. In one particular embodiment of the invention, the alkali and alkaline earth materials include groups of nitrates, such as KNO.sub.3, NaNO.sub.3 and/or Ca(NO.sub.3).sub.2, and/or carbonates, such as K.sub.2 CO.sub.3, Na.sub.2 C0.sub.3 and/or Li.sub.2 CO.sub.3.
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Griffin Steven P.
Jones W. Gary
PPG Industries Inc.
Siminerio Andrew C.
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