TREATMENT OF MELTED FLY ASH OR INCINERATION FLY ASH

摘要

PROBLEM TO BE SOLVED: To provide a method for preventing the elution of heavy metals contained in fly ash into the environment at a low cost without increasing the treating volume and a method for surely decomposing dioxin in the fly ash at low equipment cost and running cost. SOLUTION: The melted fly ash generated from a melting furnace of the municipal refuse and/or industrial waste or the incineration ash generated from an incinerator are treated by this method. Namely, the pH of the melted fly ash or incineration fly ash 11 to be treated is measured in advance the melted fly ash or incineration fly ash 11 is heated to 580-800 deg.C when the pH is >=11.0 to control the pH of the treated fly ash 14 to pH 8.5 to <11.0 to prevent the elution of the heavy metals in the treated fly ash 11, and the dioxin contained in the treated fly ash 14 is decomposed at the same time.