| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating fluorine-containing waste water by which the concentration of fluorine can be efficiently lowered to fulfil the waste water standard or below the environmental standard. SOLUTION: An alkaline earth metal oxide such as calcium oxide is added to fluorine-containing waste water and reacted to remove fluorine in the waste water. The alkaline earth metal oxide added to the waste water reacts with fluorine to form fluoride, it also takes part in a hydration reaction with water in the waste water, and in this reaction process, fluorine and the formed fluoride are incorporated into oxide crystals. The concentration of fluorine in the waste water can be lowered to a lower concentration than the solubility of the fluoride. The concentration of fluorine in the waste water can further be lowered by introducing a CO2 -containing gas in addition to the alkaline earth metal oxide.
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