Method and apparatus for treatment of dust recovered from off gases in metallurgical processes
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United States of America Patent
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Apr 2, 1991
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N/A
app pub date -
Jul 20, 1990
filing date -
Apr 2, 1987
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Abstract
The method for treating the dust entails the following steps: (a) supplying a combination of dust, a reducing agent and flux to a gastight electrothermic smelting furnace, (b) smelting, reducing and volatilizing certain metals in the smelting furnace, (c) tapping of an inert slag phase and a liquid metal phase from the smelting furnace, (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, (e) further treatment of the gas phase. 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.
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