METHOD FOR STABILIZATION PROCESSING OF MOLTEN FLY ASH AND/OR BURNED FLY ASH

摘要

PROBLEM TO BE SOLVED: To provide a method capable of economically and securely stabilizing molten fly ash and/or burned fly ash including Se contained in these fly ashes in a form that handling is convenient. SOLUTION: After the molten fly ash and/or burned fly ash and powdered substances containing slaked lime are blended, a ferrous chloride aqueous solution is added so as to allow FeCl2 to be 5.5 pts.wt. or more per 100 pts.wt. of the molten fly ash and/or burned fly ash and allow Fe to be 30 to 100 pts.wt. per 100 pts.wt. of Ca in the slaked lime contained in the powdered substances and a blended solution is kneaded either as it stands or by further adding a required amount of water thereto to prepare a kneaded product so as to allow pH to be 9 to 12.5 and allow a water content to be 15 to 30 wt.%.