| 摘要 |
PROBLEM TO BE SOLVED: To prevent the viscosity of molten slag from rising so that the slag may be discharged smoothly by adjusting the charge of iron oxide to a melting furnace, in such a way that the weight ratio of the charge becomes equal to or larger than a specific multiple of the charge of metallic aluminum. SOLUTION: While the melt of an already melted incineration residue stays in an electric resistance melting furnace 20, electrodes 21 which generate electric resistance heat are dipped in the melt. At the time of melting the incineration residue in the furnace 20, the residue is charged in the furnace 20 after removing ferrous metals from the residue by means of a magnetic separator 10 and, at the same time, a basicity adjusting material, such as the quick lime, slaked lime, etc., is charged in the furnace. In addition, the amount of iron oxide charged in the furnace is adjusted against that of metallic aluminum, so that the weight percentage of the iron oxide may become 1.3 times or more as large as that of the metallic aluminum. At the time of adjusting the amount of the iron oxide, iron oxide-containing materials are charged, as necessary.
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