| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorine ion removing agent for removing fluorine ions in wastewater to satisfy a wastewater reference value (8 mg/L) to thereby obtain certain effect, realizing an effective wastewater treatment method and capable of satisfying an environmental reference value (0.8 mg/L).SOLUTION: The fluorine ion removing agent contains semi-baked dolomite, which is obtained by baking dolomite and characterized in that the content of free calcium oxide is 1.5 wt.% or below, preferably 1.2 wt.% or below and the content of free magnesium oxide is 7 wt.% or above, preferably 19 wt.% or above, as an effective component and enables two-stage wastewater treatment wherein a part of fluorine ions in wastewater is first removed by slaked lime and the residual fluorine ions are subsequently removed by the fluorine ion removing agent. |
