Treating fluoride-containing waste water to precipitate calcium fluoride, for reuse in hydrofluoric acid production, uses calcium hydroxide in fluidized bed reactor containing calcium carbonate particles

摘要

Treatment of fluoride-containing waste water involves producing synthetic calcium fluoride from the water by precipitation in a fluidized bed reactor, using calcium hydroxide as reactant. The precipitate is formed on the surface of small calcium carbonate particles, maintained in a fluidized state in the reactor.