To provide a method for fixing arsenic compounds in contaminants which can certainly and uniformly fix and detoxify arsenic compounds in contaminants covering a diversity of the contaminants on the spot when a chemical agent is used particularly fixing for the arsenic compounds in the contaminants.
The method for fixing the arsenic compounds in the contaminants by adjusting pH of the contaminants through adding an iron-based chemical agent, an alkaline agent and water to the contaminants containing the arsenic compounds adjusts the pH of the contaminant to 9 or more and then cures the contaminants for 24 hr or longer under the air environments. The iron-based chemical agent is preferably at least one compound selected from a group consisting of ferric chloride, ferric sulfate and a polyferric sulfate. The alkaline agent adjusting pH is preferably calcium hydroxide.
COPYRIGHT: (C)2008,JPO&INPIT
| JP2005144255A | 2005-06-09 | |||
| JP2004008854A | 2004-01-15 | |||
| JPH0929208A | 1997-02-04 | |||
| JP2001121131A | 2001-05-08 |
Einosuke Kishimoto
Akira Watanabe
Kiyosue Yasuko
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