Method and apparatus for preparing molten glass

Abstract From the Canadian patent

Volatile borates and/or fluorides are removed from the hot stack gases of a glass furnace by passing the hot stack gases up through a layer of wet pellets containing ions of an alkaline earth metal or an alkali metal. The pellets may contain solid borates and/or fluorides as part of the feed to the glass furnace and still absorb volatile materials from the stack gases so long, as the borates and/or fluorides in the pellets are in or are, converted to, a less soluble and volatile form than are the volatile materials in the stack gases. Ca(OH)2 is a preferred material for converting the volatiles into an essentially nonvolatile form. Ion exchange materials such as clay, can also. he used to …