Method of calcining and liquefying glass batch
AssigneePPG Industries, Inc.
InventorsHenry M. Demarest, Jr., Joseph M. Matesa
Life of this patent
Estimating the term…
Abstract
In a two stage glass batch liquefying process, calcium source material is preheated in a first stage in the absence of the major sodium source material, and the heated calcium source material and the sodium source material are combined and liquefied in a second stage.
Claims21
A method of liquefying glass batch comprising feeding to a preheating vessel a first glass batch portion including a carbonate and substantially free of constituents that fuse at a temperature below the calcination temperature of the carbonate, heating the first batch portion in the preheating vessel to at least 1600.degree. F. so as to calcine a substantial portion of the carbonate, discharging the heated first batch portion from the preheating vessel and feeding it before it has cooled to a liquefying vessel, feeding a second glass batch portion to the liquefaction vessel separately from the first glass batch portion, the second glass batch portion including constituents that would fuse at temperatures below the calcining temperature of the carbonate in the first glass batch portion, and heating the first and second portions in the liquefying vessel to liquefy the glass batch.
The method of claim 2 wherein the first glass batch portion includes a calcium carbonate source material, and the second glass batch portion includes a sodium source material.
Dependencies are inferred from the claim text.