Process for melting and refining soda-lime glass
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United States of America Patent
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Jun 9, 2015
Grant Date -
Aug 30, 2012
app pub date -
Feb 24, 2011
filing date -
Feb 24, 2011
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Abstract
A process for making soda-lime glass includes calcining calcium carbonate in solid phase and at elevated temperature to form calcium oxide in solid phase and carbon dioxide gas. Sodium silicate glass is formed and refined separately in liquid phase. The solid phase calcium oxide is dissolved in the refined liquid phase sodium silicate glass to form a soda-lime glass melt. Formation of sodium silicate glass as an intermediate product before mixing with calcium oxide has the advantage of promoting release of gaseous reaction products from the sodium silicate glass during the refining step due at least in part to the relatively low viscosity of the sodium silicate glass. One or more steps in the process can be carried out under reduced pressure to promote release of gases and to reduce bubble formation.
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