Method for Recycling-Processing of Dust Generated in Converter Furnace

Abstract

To provide a method for recycling processing of dust generated in a converter furnace for collecting the dust at a low cost in a short time and returning it as a metallic iron resource to the converter process. In a method for recycling processing of dust generated in a converter furnace, including: crushing and drying a cake formed by adding a binder to a slurry containing iron powder-containing dust that is generated at the time of converter blowing and wet-collected to produce a mixed slurry and subjecting the produced mixed slurry to a dehydration treatment in a filter press; accumulating the cake in an accumulation tank; and charging the cake into a converter furnace, the crushed product in the accumulation tank is kept at a temperature of less than 90° C. by forcibly passing air into the accumulation tank and charged into a converter furnace according to the converter operation.

1 . A method for recycling processing of dust generated in a converter furnace, comprising: crushing and drying a cake; accumulating the cake in an accumulation tank; and charging the cake into a converter furnace, the cake being formed by adding a binder to a slurry containing iron powder-containing dust that is generated at the time of converter blowing and wet-collected to produce a mixed slurry and subjecting the produced mixed slurry to a dehydration treatment in a filter press,
 the method comprising forcibly passing air into the accumulation tank to keep a crushed product in the accumulation tank at a temperature of less than 90° C., and charging the crushed product into a converter furnace according to a converter operation.   
     
     
         2 . The method for recycling processing of dust generated in a converter furnace according to  claim 1 , wherein the slurry comprises iron powder-containing dust B as a remainder after separating iron powder-containing dust A exceeding a set separation particle diameter from the wet-collected iron powder-containing dust. 
     
     
         3 . The method for recycling processing of dust generated in a converter furnace according to  claim 2 , wherein the separation particle diameter is set to a range of 60 to 500 μm. 
     
     
         4 . The method for recycling processing of dust generated in a converter furnace according to  claim 2 , wherein quick lime is added as the binder in an amount of 3 to 15% relative to a weight of the iron powder-containing dust B in said slurry. 
     
     
         5 . The method for recycling processing of dust generated in a converter furnace according to  claim 1 , wherein the slurry has a specific gravity of 1.2 to 1.35 and a viscosity of 0.2 to 1 dPa·s. 
     
     
         6 . The method for recycling processing of dust generated in a converter furnace according to  claim 3 , wherein quick lime is added as the binder in an amount of 3 to 15% relative to a weight of the iron powder-containing dust B in said slurry. 
     
     
         7 . The method for recycling processing of dust generated in a converter furnace according to  claim 2 , wherein the slurry has a specific gravity of 1.2 to 1.35 and a viscosity of 0.2 to 1 dPa·s. 
     
     
         8 . The method for recycling processing of dust generated in a converter furnace according to  claim 3 , wherein the slurry has a specific gravity of 1.2 to 1.35 and a viscosity of 0.2 to 1 dPa·s. 
     
     
         9 . The method for recycling processing of dust generated in a converter furnace according to  claim 4 , wherein the slurry has a specific gravity of 1.2 to 1.35 and a viscosity of 0.2 to 1 dPa·s. 
     
     
         10 . The method for recycling processing of dust generated in a converter furnace according to  claim 6 , wherein the slurry has a specific gravity of 1.2 to 1.35 and a viscosity of 0.2 to 1 dPa·s.