To recover valuable metals having good quality at high recovering rate by mixing aluminum residual ash, SiC and an industrial waste containing iron base metallic oxide and forming them, charging this formed mixing mateal together with reducing agent into a smelting furnace and executing reduction-smelting.
Iron and steel dust and iron and steel scale, etc., as by-product of the iron and steel are used as raw mateal and inner charged carbonaceous material of carbon breeze, etc., as the reducing agent is added to this raw mateal and also, the aluminum residual ash produced at the time of working the aluminum and the SiC powdery and granular material are added and sufficiently, mixed to make briquette by using a briquetting machine. At this time, blending ratio of the iron and steel by-product, aluminum residual ash and SiC are desirable to be 85-95:12-4:3-1. After curing this briquette, if necessary, this briquette is charged into a roasting device and ignited and burnt, and the vaporized matter is removed and also, the roasting is executed, and the roasted briquette is charged into the smelting furnace to execute the reduction-smelting. Further, in the smelting furnace, if necessary, the outer charged carbonaceous material is added and desirably, the reduction-smelting is executed by arc-heating to melt the briquette.
KOSHIBA GIICHI
OTANI YASUO
ASAHI GIKEN HANBAI KK