製錬技術の適用による環境安全性の高い焼却飛灰新処理技術開発

概要

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We had developed new process to treat fly ash generated from municipal incinerators by employing the nonferrous metals refining technology. We clarified the removal mechanism of heavy metals such as lead and cadmium and optimized the conditions based on thermodynamics and metallurgical approaches. We demonstrated by the pilot plant facility with the designed capacity of 100kg/hr that harmful heavy metals like lead are safely removed to trace levels which satisfy the Japanese soil environmental standards. Furthermore, the fly ash treated by this new technology also has passed leaching tests at pH 4 simulating typical acid rain circumstances, so that it can be recycled, for example, as artificial lightweight aggregate. It was also found that volatilized metals collected as secondary ash can be recycled as smelting resources. We could verify at the same time new technology was very conformable as industrial process with developing technologies for materials and equipment. New process will be very useful to fly ash treatment and recycling in the future, as the general technology to treat many types of ashes.
社団法人資源・素材学会の論文
2004-08-25