| 摘要 |
PROBLEM TO BE SOLVED: To provide a treatment method to stabilize the harmful heavy metals included in the alkaline flying ashes discharged from an incineration furnace so as not to reelute the heavy metals, etc. SOLUTION: Amorphous aluminum hydroxide formed by drying aluminum sludge and pulverizing this sludge is mixed with waste contg. at least one harmful metals selected from a group consisting of lead, cadmium, mercury, chromium, copper, nickel and zinc at 3 to 30wt.% of the waste and the mixture prepd. by adding water at need thereto is kneaded, cured and solidified. As a result, the harmful heavy metals, such as mercury, arsenic, copper, lead, cadmium and chromium, and more particularly, lead, are efficiently stabilized and the amt. of their elution is decreased. This treatment method is extremely effective for the stabilization treatment and is capable of stably treating the slurry-like sludge and dehydrated cake sludge discharged after the treatment of various kinds of waste liquids in semiconductor plants and plating factories, the harmful collected dust for maintenance of the working enviromnent in iron works, electric furnaces and melting kilns, etc., in the workshops the flying ashes emitted from municipal refuse melting furnaces, the polluted soil by discarding disposition for reclamation, etc. |
