MELTING FURNACE WASTE GAS TREATING METHOD

PROBLEM TO BE SOLVED: To provide a treating method for waste gas of melting capable of reducing dioxins in the melting furnace waste gas without using an adsorbing agent such as activated carbon and capable of easily returning recovered collected ashes to a mine site. SOLUTION: The incinerated ash of an incinerator is melted at a melting furnace 1, and an acidic gas component in the waste gas is fixed in molten fly ash as a reaction product with caustic soda by spraying the caustic soda at a gas cooling tower 3, and the molten fly ahs and the reaction product are collected and removed at an electrostatic precipitator 4, and the incinerated fly ash such as collected ash discharged from the incinerator is blown into a bag filter together with the waste gas to collect the incinerated fly ash at the bag filter 5 and to adsorb and remove the dioxins in the waste gas by the incinerated fly ash, and the collected ash of the bag filter 5 is melted together with the incinerated ash at the melting furnace 1.