| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a removing agent which can quickly remove fluorine ions in waste water, the removing agent which can effectively remove heavy metal ions, hexavalent selenium and/or hexavalent chromium in particular; and to provide a removal method using the same. <P>SOLUTION: The removing agent is prepared by mixing 100 pts.wt. of half calcined dolomite and 0.1-100 pts.wt. of a water soluble ferrous compound such as ferrous chloride or ferrous sulfate. The half calcined dolomite can be obtained by calcining dolomite and contains at most 1.2 wt.% free calcium oxide, at least 8 wt.% and preferably at least 19 wt.% free magnesium oxide. The removing agent is powdered and stirred into wastewater containing harmful substances. Then, generated precipitates are filtered to be separated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
