Method and device for direct reduction with dry vent gas de-dusting

Abstract

A method for direct reduction of metal oxide-containing starting materials to produce metallized material by contact with hot reduction gas in a reduction unit ( 1 ), wherein the product of the direct reduction is discharged from the reduction unit ( 1 ) by means of a product discharge device ( 3 ) which is flushed with seal gas and from which vent gas is drawn and subsequently de-dusted. The vent gas is de-dusted dry and the content of at least one gaseous constituent is reduced by catalytic conversion or combustion. Also, a device for carrying out the method is disclosed.

What is claimed is: 
     
         1 . A device for carrying out a direct reduction method, the device comprising:
 a reduction unit with a reduction gas supply;   a product discharge device from the reduction unit;   a seal gas supply line opening into the product discharge device;   a vent gas removal line exiting from the product discharge device;   a dry de-dusting device, the vent gas removal line opening into the dry de-dusting device, a diverting device exiting from the dry de-dusting device for diverting dry de-dusted vent gas into the atmosphere;   the diverting device comprising a reducing device for reducing the content of at least one gaseous constituent of the de-dusted vent gas, the reducing device reducing the content by catalytic conversion to at least one of CO 2  and/or H 2 O using at least one of oxygen O 2  and/or H 2 O in the form of steam, and/or by combustion to at least one of CO 2  and/or H 2 O.   
     
     
         2 . The device as claimed in  claim 1 , further comprising:
 the device for reducing the content of at least one gaseous constituent of the de-dusted vent gas is a device for reducing the CO content by catalytic conversion to CO 2  using oxygen O 2  and/or H 2 O in the form of steam, and/or by combustion to CO 2 .   
     
     
         3 . The device as claimed in  claim 2 , the device for reducing the content of at least one gaseous constituent of the de-dusted vent gas, preferably the CO content, has at least one supply line for supplying oxygen-containing and/or steam-containing gases.