Blast-furnace-blow-in charcoal and method for producing same

Abstract

In blast-furnace-blow-in charcoal that is blown in from a tuyere to the interior of a blast furnace main body of a blast furnace facility, the oxygen atom content (on a dry basis) is 10-20 wt % and the average pore size is 10-50 nm.

1 . Blast furnace injection coal to be blown into a blast furnace main unit of a blast furnace installation through a tuyere, wherein
 an oxygen atom content ratio (dry base) is between 10 and 20% by weight, and   an average pore size is between 10 and 50 nm.   
     
     
         2 . The blast furnace injection coal according to  claim 1 , wherein a pore volume is between 0.05 and 0.5 cm 3 /g. 
     
     
         3 . The blast furnace injection coal according to  claim 1 , wherein a specific surface area is between 1 and 100 m 2 /g. 
     
     
         4 . A method of manufacturing the blast furnace injection coal according to  claim 1 , wherein the method comprises:
 a drying step of heating subbituminous coal or brown coal to remove moisture; and   a pyrolysis step of performing pyrolysis at a temperature between 460 and 590° C. on the coal dried in the drying step.   
     
     
         5 . The method of manufacturing the blast furnace injection coal according to  claim 4 , wherein the method further comprises:
 a cooling step of cooling the coal subjected to the pyrolysis in the pyrolysis step to a temperature between 50 and 150° C.; and   a partially oxidizing step of partially oxidizing the coal cooled in the cooling step by exposing the coal in an oxygen-containing atmosphere at a temperature between 50 and 150° C. to let the coal chemically adsorb oxygen.