C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
261/13, 23/189
C01B 33/32 (2006.01) C03C 3/04 (2006.01)
Patent
CA 1085138
ABSTRACT OF THE DISCLOSURE Improved production of alkali metal silicate glass is achieved herein by vigorous steam bubbling through the molten glass bed during the preparation of glass by fusion. The process includes the steps of: (a) charging raw materials, sources of alkali selected from the group con- sisting of sodium carbonate, potassium carbonate and mixtures of sodium carbonate and potassium carbonate, and a source of silica such as sand into an open hearth furnace with a bed area for fusion reactions, equipped with a draw hole and charging ports; (b) maintaining the temperature within the furnace above 1093°C. so that a bed of molten silicate glass is formed and the unreacted raw materials float on the molten glass bed; (c) introducing dry saturated steam under pressure into the molten glass through bubbling means located in the furnace bed area so that bubbles of steam pass from the bottom of the molten glass bed to the top, the pressure of the steam being regulated to produce bubbles 20.3 to 45.7 cm in diameter breaking the surface of the molten glass at a rate of 5 to 20 bubbles per second; and (d) withdrawing the molten glass from the surface. Such prac- tice results in the production of alkali metal silicate glass having a mol ratio of 1.5 to 4.5 parts of SiO2 per part of M2O wherein M is selected from the group consisting of sodium, potassium and mixtures of sodium and potassium and containing 0.05 to 2% water and sufficient bubbles to pro- mote fracturing. The process results in higher production using less fuel. The product glass is easier to dissolve and results in solutions of greater clarity.
253816
Marcus & Associates
Pq Corporation
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