| abstract |
The method for treating the dust entails the following steps: n (a) supplying a combination of dust, a reducing agent and flux to a gastight electrothermic smelting furnace, n (b) smelting, reducing and volatilizing certain metals in the smelting furnace, n (c) tapping of an inert slag phase and a liquid metal phase from the smelting furnace, n (d) continuous removal from the smelting furnace of a gas phase containing chiefly CO-gas, metal fumes, sulphur, chlorides and fluorides together with entrained unreacted dust, n (e) further treatment of the gas phase. n The process produces an inert slag phase which can be safely deposited in a landfill. The process also allows for recovery of valuable metal components from the dust. |