Method of adjusting precursor powder for sintered ore, and precursor powder for sintered ore

Abstract

A precursor powder for sintered ore, which offers excellent sintered ore production efficiency, can be adjusted independently of the quality of iron ore, by setting a mixing ratio [(C/F)×100] of a mass (C) of particles having a particle size of 3 mm or more in coke breeze to a mass (F) of particles having a particle size of 3 mm or more in an iron ore raw material in the range of 2% to 3%.

1 .- 4 . (canceled) 
     
     
         5 . A method of adjusting a precursor powder for sintered ore, comprising:
 mixing and granulating an iron ore raw material, coke breeze, and an auxiliary raw material in a drum mixer to obtain a precursor powder for sintered ore; and   charging the precursor powder to a sintering machine where the precursor powder is sintered to produce sintered ore to be used in a blast furnace,   wherein the mixing and the granulating are performed with a mixing ratio [(C/F)×100] of a mass (C) of particles having a particle size of 3 mm or more in the coke breeze to a mass (F) of particles having a particle size of 3 mm or more in the iron ore raw material being adjusted to 2% to 3%.   
     
     
         6 . The method according to  claim 5 , wherein the mixing ratio [(C/F)×100] is 2.2% to 2.8%. 
     
     
         7 . A precursor powder for sintered ore to be used in a blast furnace, the precursor powder comprising:
 an iron ore raw material;   coke breeze; and   an auxiliary raw material,   wherein a mixing ratio [(C/F)×100] of a mass (C) of particles having a particle size of 3 mm or more in the coke breeze to a mass (F) of particles having a particle size of 3 mm or more in the iron ore raw material is 2% to 3%.   
     
     
         8 . The precursor powder according to  claim 7 , wherein the mixing ratio [(C/F)×100] is 2.2% to 2.8%.