| 摘要 |
PROBLEM TO BE SOLVED: To prevent the elution of heavy metals surely by preparing a one component heavy metal fixing agent for preventing the elution of heavy metals from heavy metal-containing ash, heavy metal-polluted soil, and the like, to contain specified amounts of a phosphoric acid compound, an iron (III) salt, and water, respectively. SOLUTION: A one component heavy metal fixing agent which can fix heavy metals including lead, cadmium, arsenic, and antimony effectively to surely prevent the elution of them is obtained by incorporating 5-50 wt.% of a phosphoric acid compound, 1-15 wt.% of an iron (III) salt, and 20-94 wt.% of water. In the fixing agent, the iron salt fixes the heavy metals by a process in which produced iron hydroxide and the heavy metals form scarcely soluble salts to be coprecipitazed. The phosphoric acid compound fixes lead and cadmium in heavy metal-containing waste and acts mutually with the iron salt to strengthen a heavy metal fixing capacity. An iron (II) salt can be incorporated in an amount not to damage the stability of the agent.
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