Method and device for processing flue dust

Abstract

The method and the device serve to treat the flue dust formed during the production of nonferrous metals. After the addition of sulfur and/or a sulfur compound, the flue dust is heated, and volatile compounds are separated in a downstream offgas treatment unit. The flue dust is heated in an inert atmosphere.

1 - 10 . (canceled) 
     
     
         11 . A method for processing flue dust formed during production of nonferrous metals, comprising the steps of: adding sulfur and/or a sulfur compound; heating the flue dust after the addition of the sulfur and/or sulfur compound; and separating volatile components, the flue dust being heated in an inert atmosphere. 
     
     
         12 . The method according to  claim 11 , including volatilizing arsenic in elementary form or in form of arsenic-sulfur compounds and then separating. 
     
     
         13 . The method according to  claim 11 , including conducting treatment of the flue dust as a continuous process. 
     
     
         14 . The method according to  claim 11 , including conducting treatment of the flue dust as a discontinuous process. 
     
     
         15 . The method according to  claim 11 , including carrying out treatment of the flue dust at ambient pressure. 
     
     
         16 . The method according to  claim 11 , including carrying out treatment of the flue dust at a negative pressure. 
     
     
         17 . The method according to  claim 11 , including carrying out the treatment of the flue at a positive pressure. 
     
     
         18 . The method according to  claim 11 , wherein the heating of the flue dust includes heating the flue dust at least temporarily to a temperature in the range of 500-1,000° C. 
     
     
         19 . The method according to  claim 11 , wherein an average amount of sulfur dioxide in the offgas is no greater than 5 vol. %. 
     
     
         20 . A device for treating flue dust formed during production of nonferrous metals, the device comprising: a mixer for supplying and distributing sulfur and/or a sulfur compound; and a unit for thermally treating a mixture produced by the mixer; a separator for volatile components; and a supply unit for providing an inert atmosphere, the supply unit being connected to the unit for thermal treatment.