To solve a problem wherein heavy metal insoluble treatment of heavy metal-containing materials cannot be securely performed by using necessary amount of a heavy metal treatment agent determined by a conventional method for determining necessary amount of the heavy metal treatment agent.
This invention is effective for a treatment method for heavy metal-containing materials. In the treatment method, a heavy metal treatment agent is added to a solution in which heavy metal is eluted from a heavy metal-containing material by water, carboxylic acid having an asymmetric structure and/or a hydroxycarboxylic acid having an asymmetric structure to measure turbidity. The necessary amount of the heavy metal treatment agent is determined from the addition amount of the heavy metal treatment agent at an end point where the change in turbidity becomes constant or an inflection point of the change in turbidity. In particular, the necessary amount of the heavy metal treatment agent determined in the process, alkali metal hydroxide and/or alkaline earth metal hydroxide are added to the heavy metal-containing material, bringing the P alkalinity to at least 200 g-CaCO3/kg-heavy metal-containing material.
NAGAMINE TOSHITAKA
| JP2011056495A | 2011-03-24 | |||
| JP4599913B2 | 2010-12-15 | |||
| JP2008272590A | 2008-11-13 | |||
| JP2008184470A | 2008-08-14 |
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