| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a treating agent containing a calcium compound beforehand with an aluminum compound, and suitable for reducing the fluorine concentration in fluorine-containing water, using a waste liquid exhausted from an aluminum treatment process as a raw material. <P>SOLUTION: This method for producing the treating agent includes: a process of depositing at least aluminum hydroxide and calcium sulfate in the waste liquid by supplying at least the calcium compound 32 to the waste liquid 31, which is exhausted from the aluminum treatment process and contains an aluminum ion and a sulfate ion, to adjust the pH of the waste liquid from 5 to 8; and a process of separating a precipitate 35 in the waste liquid from the waste liquid. The treating agent is supplied to the fluorine-containing water, and decreases the fluorine concentration in the fluorine-containing water. <P>COPYRIGHT: (C)2012,JPO&INPIT |
