Method for manufacturing agglomerate and reduced iron

Abstract

A process for producing an agglomerate comprising heat treating an iron oxide-containing powder at a heating temperature of 900 to 1,200° C., and granulating an obtained heat treated powder, as a raw material, thereby producing an agglomerate, wherein the iron-oxide-containing powder has a 50% particle diameter of 2 μm or less.

1 . A process for producing an agglomerate, comprising
 heat-treating an iron-oxide-containing powder having a 50% particle diameter of 2 μm or less at a heating temperature of 900 to 1,200° C., and   granulating an obtained heat-treated powder, as a raw material, thereby producing an agglomerate.   
     
     
         2 . The process according to  claim 1 , wherein the granulation is conducted by a rolling granulation method. 
     
     
         3 . The process according to  claim 1 , wherein the heat treatment is conducted so that the heat-treated powder has a 50% particle diameter of 4 μm or larger. 
     
     
         4 . The process according to  claim 1 , wherein the heat treatment is conducted for a heating period of 30 minutes or longer. 
     
     
         5 . The process according to  claim 1 , wherein the heat treatment is conducted while rolling the iron-oxide-containing powder. 
     
     
         6 . The process according to  claim 1 , wherein the iron-oxide-containing powder is a tailing. 
     
     
         7 . The process according to  claim 6 , wherein the tailing is a residue which has remained after Ni recovery from a Ni-containing ore. 
     
     
         8 . A process for producing a reduced iron, wherein the agglomerate obtained by the process according to  claim 1  is heated, thereby producing a reduced iron. 
     
     
         9 . The process according to  claim 8 , wherein the agglomerate further contains a carbonaceous reducing agent. 
     
     
         10 . The process according to  claim 2 , wherein the heat treatment is conducted so that the heat-treated powder has a 50% particle diameter of 4 μm or larger. 
     
     
         11 . The process according to  claim 2 , wherein the heat treatment is conducted for a heating period of 30 minutes or longer. 
     
     
         12 . The process according to  claim 2 , wherein the heat treatment is conducted while rolling the iron-oxide-containing powder. 
     
     
         13 . The process according to  claim 2 , wherein the iron-oxide-containing powder is a tailing. 
     
     
         14 . The process according to  claim 13 , wherein the tailing is a residue which has remained after Ni recovery from a Ni-containing ore. 
     
     
         15 . A process for producing a reduced iron, wherein the agglomerate obtained by the process according to  claim 2  is heated, thereby producing a reduced iron.