TREATMENT FOR DETOXIFYING/RECYCLING OF INCINERATE ASH AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To produce a recycled product of incinerate ash that no dioxin is detected by analysis and eluation of heavy metals can be prevented in hydrolyzing reaction by accelerated test under an strongly acidic environment by a method hardly causing environmental pollution. SOLUTION: In a treatment for detoxifying/recycling of incinerate ash, a stage in which raw ash is treated by keeping in a space in a low oxygen state insulated from the air at a fixed temp. for a fixed time and generated exhaust gas is catalytically heat treated is provided and the gas is heated in the presence of a transition metal catalyst. A method is composed of a reducing reaction stage and a stabilizing reaction stage. The exhaust gas is subjected to the detoxifying treatment at a reducing reaction stage. The incinerate ash to be treated is pulverized to particulates of 100-150 mesh before a stabilizing reaction stage and/or the reducing reaction stage. The reducing reaction stage is kept at about 400-600 deg.C for 20-40 min. The stabilizing reaction stage is kept at about 200-450 deg.C for 40-60 min. The device is composed of a reducing reaction device, a stabilizing reaction device and an exhaust gas treating device.