METHOD FOR SELECTIVELY REMOVING PHOSPHORIC ACID FROM WASTE WATER CONTAINING FLUORINE AND PHOSPHORIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for selectively removing phosphoric acid from waste water containing fluorine and phosphoric acid so as to reuse fluorine in waste water as a resource.;SOLUTION: A zirconium compound is added to waste water containing fluorine and phosphoric acid and the pH of the zirconium compound-added waste water is kept higher than 7 to remove phosphoric acid selectively from the waste water. In particular, if the pH of the zirconium compound-added waste water is kept equal to or lower than 7 temporarily and then kept higher than 7, fluorine is hardly removed and phosphoric acid of ≥90% can be removed.;COPYRIGHT: (C)2008,JPO&INPIT