Briquette as material for steel making and method for production thereof

Abstract

Cotton-like aggregates (B) containing grinding chips from an iron-based metal and a grinding fluid containing oil and water are compression molded thereby forming a brittle compact (C) in which the fibrous grinding chips are roughly sheared and which is removed of excessive water and oil. The brittle compact (C) is crushed for further finely shearing the grinding chips and then, the resultant grinding chips are mixed with a solidification assistant (D) for obtaining powder (E) containing the solidification assistant (D). The powder (E) is solidified by compression molding, thereby forming a water-containing briquette (F). A briquette (A) for use as steelmaking material, which contains powdery pure iron and oil, is obtained by removing the water from the water-containing briquette (F). Without crushing the brittle compact (C), it is also possible to form the briquette (A) for use as steelmaking material by impregnating the brittle compact (C) with the solidification assistant (D) and then drying th compact.

What is claimed is:  
     
         1 . A briquette for use as steelmaking material, which contains-powdery pure iron and oil and is dried, said briquette formed by solidifying powder using a solidification assistant, said powder obtained by finely shearing cotton-like aggregates containing grinding chips from an iron-based metal.  
     
     
         2 . The briquette for use as steelmaking material as claimed in  claim 1 , further containing coke powder.  
     
     
         3 . The briquette for use as steelmaking material as claimed in  claim 2 , further containing recovery dust powder collected in a steelmaking process.  
     
     
         4 . The briquette for use as steelmaking material as claimed in  claim 1 , wherein said solidification assistant is at least one selected from the group consisting of rice polishings, blackstrap molasses, starches, calcined lime, coloidal silica, silicate of soda, aluminum phosphate, vinyl acetate sludge, asphalt emulsion and bentonite.  
     
     
         5 . A briquette for use as steelmaking material, which contains powdery pure iron and oil and is dried, said briquette formed by impregnating a brittle compact with an inorganic solidification assistant for solidification, said brittle compact formed by compression molding cotton-like aggregates containing grinding chips from an iron-based metal.  
     
     
         6 . The briquette for use as steelmaking material as claimed in  claim 5 , wherein said in organic solidification assistant is at least one selected from the group consisting of coloidal silica, silicate of soda and aluminum phosphate.  
     
     
         7 . The briquette for use as steelmaking material as claimed in  claim 4  or  6 , containing 2 to 30 wt % of said solidification assistant.  
     
     
         8 . The briquette for use as steelmaking material as claimed in  claim 1  or  5 , wherein said briquette is substantially shaped like a pillow.  
     
     
         9 . A method for forming a briquette for use as steelmaking material comprising in this order: 
 a step of compression molding cotton-like aggregates containing grinding chips from an iron-based metal and a grinding fluid containing oil and water, thereby forming a brittle compact in which the fibrous grinding chips are roughly sheared and which is removed of excessive water and oil;    a step of crushing said brittle compact for further finely shearing the grinding chips, and mixing the resultant grinding chips with a solidification assistant for obtaining powder containing said solidification assistant;    a step of forming a briquette by compression molding a predetermined amount of said powder for solidification; and    a step of drying the resultant briquette.    
     
     
         10 . The method for forming the briquette for use as steelmaking material as claimed in  claim 9 , wherein at least one selected from the group consisting of rice polishings, blackstrap molasses, starches, calcined lime, coloidal silica, silicate of soda, aluminum phosphate, vinyl acetate sludge, asphalt emulsion and bentonite is employed as said solidification assistant.  
     
     
         11 . The method for forming the briquette for use as steelmaking material as claimed in  claim 10 , wherein said solidification assistant is admixed in an amount of 2 to 30 wt %.  
     
     
         12 . A method for forming a briquette for use as steelmaking material comprising in this order: 
 a step of compression molding cotton-like aggregates containing grinding chips from an iron-based metal and a grinding fluid containing oil and water, thereby forming a brittle compact in which the fibrous grinding chips are roughly sheared and which is removed of excessive water and oil;    a step of impregnating said brittle compact with a solidification assistant; and    a step of drying said brittle compact impregnated with said solidification assistant.    
     
     
         13 . The method for forming the briquette for use as steelmaking material as claimed in  claim 12 , wherein at least one selected from the group consisting of coloidal silica, silicate of soda and aluminum phosphate is employed as said solidification assistant.  
     
     
         14 . The method for forming the briquette for use as steelmaking material as claimed in  claim 13 , wherein said solidification assistant is impregnated in an amount of 2 to 30 wt %.  
     
     
         15 . A method for forming a briquette for use as steelmaking material comprising in this order: 
 a step of compression molding cotton-like aggregates containing grinding chips from an iron-based metal and a grinding fluid containing oil and water, thereby forming a brittle compact in which the fibrous grinding chips are roughly sheared and which is removed of excessive water and oil;    a step of crushing said brittle compact for further finely shearing the grinding chips, and mixing the resultant grinding chips with coke and a solidification assistant for obtaining powder containing said coke and solidification material;    a step of forming a briquette by compression molding a predetermined amount of said powder for solidification; and    a step of drying the resultant briquette.    
     
     
         16 . The method for forming the briquette for use as steelmaking material as claimed in  claim 15 , wherein said crushed brittle compact is further admixed with recovery dusts collected in a steelmaking process.  
     
     
         17 . The method for forming the briquette for use as steelmaking material as claimed in  claim 16 , wherein said recovery dusts are admixed in an amount of 10 to 30 wt %.  
     
     
         18 . The method for forming the briquette for use as steelmaking material as claimed in  claim 15 , wherein said solidification assistant is at least one selected from the group consisting of rice polishings, blackstrap molasses, starches, calcined lime, coloidal silica, silicate of soda, aluminum phosphate, vinyl acetate sludge, asphalt emulsion and bentonite.  
     
     
         19 . The method for forming the briquette for use as steelmaking material as claimed in  claim 15 , wherein said solidification assistant is admixed in an amount of 1 to 10 wt %.  
     
     
         20 . The method for forming the briquette for use as steelmaking material as claimed in  claim 15 , wherein said coke is admixed in an amount of 5 to 50 wt %.  
     
     
         21 . The method for forming the briquette for use as steelmaking material as claimed in any one of claims  9 ,  12  and  15 , wherein said employed cotton-like aggregates are adjusted for the content of water to less than 50 wt % and for the content of oil to less than 10 wt %.  
     
     
         22 . The method for forming the briquette for use as steelmaking material as claimed in any one of claims  9 ,  12  and  15 , wherein said brittle compact is adjusted for the content of water to 2 to 12 wt % and for the content of oil to 1 to 5 wt %.  
     
     
         23 . The method for forming the briquette for use as steelmaking material as claimed in any one of claims  9 ,  12  and  15 , wherein immediately after said compression molding, said briquette is subjected to quick cooling.  
     
     
         24 . The method for forming the briquette for use as steelmaking material as claimed in any one of claims  9 ,  12  and  15 , wherein a product substantially shaped like a pillow is obtained as said briquette.  
     
     
         25 . The method for forming the briquette for use as steelmaking material as claimed in any one of claims  9 ,  12  and  15 , wherein a material containing not less than 0.2 wt % of carbon is employed as said grinding chips.