Method for producing iron ore pellets

Abstract

A method for producing iron ore pellets for operation of a blast furnace, where the iron ore pellets have a CaO/SiO2 mass ratio greater than or equal to 0.8 and a MgO/SiO2 mass ratio greater than or equal to 0.4, the method including balling green pellets by adding water to an iron ore material and dolomite and firing the green pellets. The dolomite is in a miniaturized state in a structure of the green pellets.

1 . A method for producing iron ore pellets for operation of a blast furnace, wherein the iron ore pellets have a CaO/SiO 2  mass ratio greater than or equal to 0.8 and a MgO/SiO 2  mass ratio greater than or equal to 0.4, the method comprising:
 balling green pellets by adding water to an iron ore material and dolomite; and   firing the green pellets,   wherein the dolomite is in a miniaturized state in a structure of the green pellets.   
     
     
         2 . The method for producing iron ore pellets according to  claim 1 , further comprising preparing the dolomite,
 wherein in the preparing, the dolomite is pulverized such that a Blaine specific surface area is greater than or equal to 4,000 cm 2 /g.   
     
     
         3 . The method for producing iron ore pellets according to  claim 1 , further comprising preparing the dolomite,
 wherein in the preparing, the dolomite is calcined at a temperature greater than or equal to 900° C.   
     
     
         4 . The method for producing iron ore pellets according to  claim 1 , wherein a firing temperature in the firing is greater than or equal to 1,250° C.