Solid carbonized agglomerate, and its manufacturing method

Abstract

A carbonized solid agglomerate for use in a blast furnace, comprising in its composition: at least one source of carbon (10); at least one source of calcium (11); and at least one binder (12); wherein, after mechanical shaping (200) of the solid agglomerate, the agglomerate is subjected to a pyrolyzing step (400) at a temperature greater than or equal to 600° C. and less than 800° C.; wherein the solid agglomerate comprises 25 to 35% by mass of the at least one source of calcium (11). A method for manufacturing the proposed solid agglomerate.

1 . A solid carbonized agglomerate for use in blast furnaces, the solid carbonized agglomerate comprising:
 at least one source of carbon ( 10 );   at least one source of calcium ( 11 ); and   at least one binder ( 12 ),   wherein after the mechanical shaping ( 200 ) of the solid agglomerate, the solid agglomerate is subjected to a pyrolyzing step ( 400 ) at a temperature greater than or equal to 600° C. and less than 800° C., and   wherein the solid agglomerate comprises 25 to 35% by mass of at least one source of calcium ( 11 ).   
     
     
         2 . The solid agglomerate according to  claim 1 , wherein the at least one source of carbon ( 10 ) is selected from the group consisting of: biocarbon, coal and metallurgical coal. 
     
     
         3 . The solid agglomerate according to  claim 1 , wherein the at least one source of calcium ( 11 ) is a source of calcium oxide selected from the group consisting of: limestone and calcium-containing steel waste. 
     
     
         4 . The solid agglomerate according to  claim 1 , wherein the at least one binder ( 12 ) is an organic binder. 
     
     
         5 . The solid agglomerate according to  claim 1 , comprising 60 to 90% by mass of the at least one source of carbon ( 10 ). 
     
     
         6 . The solid agglomerate according to  claim 5 , wherein the at least one source of carbon ( 10 ) comprises up to 70% by mass of biocarbon and between 30 and 100% by mass of coal. 
     
     
         7 . The solid agglomerate according to  claim 1 , comprising 5 to 10% by mass of the at least one binder ( 12 ). 
     
     
         8 . The solid agglomerate according to  claim 1 , further comprising 5 to 15% by mass of an iron-based compound. 
     
     
         9 . The solid agglomerate according to  claim 8 , wherein the iron-based compound is iron oxide or metallic iron. 
     
     
         10 . A method of manufacturing a solid carbonized agglomerate for use in a blast furnace, the method comprising:
 mixing ( 100 ) at least one source of carbon ( 10 ), at least one source of calcium ( 11 ) and at least one binder ( 12 );   mechanically shaping ( 200 ) a mixture of the at least one source of carbon ( 10 ), the at least one source of calcium ( 11 ) and the at least one binder ( 12 ) to form a solid shaped agglomerate ( 20 ); and   pyrolyzing ( 400 ) the solid shaped agglomerate ( 20 ) at a temperature greater than or equal to 600° C. and less than 800° C.;   wherein the solid shaped agglomerate comprises 25 to 35% by mass of at least one source of calcium ( 11 ).   
     
     
         11 . The method according to  claim 10 , further comprising mixing 60 to 90% by mass of the at least one source of carbon ( 10 ), wherein the at least one source of carbon ( 10 ) is selected from the group consisting of: biocarbon, coal and/or metallurgical coal. 
     
     
         12 . The method according to  claim 11 , comprising forming the at least one source of carbon ( 10 ) with up to 70% by mass of biocarbon and between 30 and 100% by mass of coal. 
     
     
         13 . The method according to  claim 10 , wherein the step of mixing ( 100 ) comprises mixing 5 to 10% by mass of the at least one binder. 
     
     
         14 . The method according to  claim 10 , wherein the step of mixing ( 100 ) comprises mixing 5 to 15% by mass of an iron-based compound. 
     
     
         15 . The method according to  claim 14 , wherein the iron-based compound is iron oxide or metallic iron. 
     
     
         16 . The method according to  claim 10 , further comprising, after the mechanical shaping step ( 200 ), drying ( 300 ) the shaped agglomerate ( 20 ) in an oven at 105° C. for two hours with the humidity inside the oven being less than 1%.