Significant amounts of soluble fluoride, known to create problems in
processes requiring high quality grade calcium chloride, are removed from calcium
chloride solution using hydroxyapatite as a removal mechanism. Under acidic conditions,
calcium chloride solution is purified to about less than 10 ppm fluoride, significantly,
to less than 1 ppm fluoride. At least 0.1 weight percent hydroxyapatite and concentrated
hydrochloric acid are added to calcium chloride solution and slurried to remove
fluoride and create a highly purified calcium chloride solution, substantially
free of fluoride.