Method for manufacturing solids containing modified calcium fluoride

Abstract

This invention relates to a method for manufacturing a solid containing modified calcium fluoride. The method involves separating the lime component from a calcium fluoride-containing solid containing calcium fluoride and at least one lime component selected from calcium carbonate, calcium hydroxide, and calcium oxide, thereby producing a calcium fluoride-containing solid with reduced lime content. Furthermore, a carbon dioxide-containing gas is supplied to a slurry containing the calcium fluoride-containing solid and water to maintain the pH value of the slurry below 6.0, thereby dissolving the lime component.