Patent ID: 11912940
Assignee: JFE STEEL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method of producing a coal mixture comprising blending a plurality of coals, wherein formula (1) and formula (2) are satisfied:

  
    
      
        
          α
          calc
        
        =
        
          
            ∑
            i
            N
          
          ⁢
          
            
              α
              i
            
            ×
            
              x
              i
            
          
        
      
    
    
      
        (
        1
        )
      
    
  

αcalc≤1.2×10−10 (mol/g-coal)  (2)

wherein αcalc is a hydrogen ion release capacity per unit mass (mol/g-coal) of the coal mixture,
αi is the hydrogen ion release capacity per unit mass (mol/g-coal) of a coal i,
xi is a blending ratio of the coal i blended in the coal mixture, and
N is a total number of brands of coal contained in the coal mixture,, wherein the hydrogen ion release capacity per unit mass of coal is calculated by dividing a product of hydrogen ion concentration calculated from pH of water in which each of the coals is immersed and the volume of the water in which the coal is immersed by the mass of each of the corresponding coals, and, when the pH of the water in which the coals are immersed is measured, the mass ratio of coal to water (coal:water) is 1:1 or more and 1:100 or less, the temperature of the water in which the coals are immersed is 0° C. or higher and 80° C. or lower, and a period of time in which the coals are immersed is 1 hour or more and 2 hours or less.