キルン焼成法による焼却炉飛灰中各種金属の揮発分離技術

概要

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A novel detoxification process for incinerator fly ash was proposed, and the removal mechanism of heavy metals from the fly ash was investigated. The process comprises of roasting the fly-ash extrudates with a rotary kiln, and removes heavy metals by chloridizing volatilization, giving harmless resultant extrudates which contain immobilized heavy metals at trace concentration. The developed roasting technique was unique, as it utilized chlorine originally contained in the fly ash and did not need additional chlorine source. Our detailed investigation proved that appropriate control of bed layer in the kiln could keep reductive atmosphere that should enhance volatilization of metals at either chloride or metals form.The extrudates derived from the process, compared to conventional chelate-solidified ash or to melting solid matter, showed less metals elution at leachate test, as well as contained descended metals content which satisfied the soil environmental standards revised recently.
社団法人資源・素材学会の論文
2004-09-25