PRODUCTION OF MOLTEN SLAG OF URBAN GARBAGE INCINERATION ASH

摘要

PURPOSE: To obtain molten slag of urban garbage incineration ash, which contains an extremely small amount of iron and a desired amt. of Na₂O and K₂O. ;CONSTITUTION: A slag discharge port 7 is provided to the wall of the intermediate part of a furnace 2 in the height direction thereof and urban garbage incineration ash 4 is charged in the furnace. No basicity control agent is charged in the furnace. Electrodes 3 are inserted in the incineration ash bed within the furnace and the incineration ash is melted to form a molten slag bed 5 and a molten metal bed 6. Subsequently, the leading ends of the electrodes 3 are inserted in the molten slag bed 5 not only to melt the incineration ash but also to allow the height of the molten slag bed 5 to coincide with that of the slag discharge port 7 and molten slag is discharged from the slag discharge port by the head pressure due to the height difference between the surface of the molten slag bed and the slag discharge port 7 to be recovered. The molten slag can be separated from the molten metal to be recovered without using the basicity control agent and the slag with the total content of iron of 1wt.% or less and with the total content of Na₂O and K₂O of 7-15wt.% is obtained.;COPYRIGHT: (C)1994,JPO&Japio