| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique which inhibits formation of coarse pseudo-grains with weak binding strength and nonuniform grain sizes in a granulation raw material for sintering, even when hard-to-granulate fine powdery iron ore is used, and granulates pseudo-grains uniform in grain size.SOLUTION: A method of producing a granulation raw material for sintering includes a mixing step of mixing blending raw materials including hard-to-granulate iron ore, a granulation step of granulating the mixed raw material in a primary granulator, and a re-granulation step of granulating the primary granulation grains produced in the granulation step further in a secondary granulator, and a disintegration step of disintegrating coarse primary-granulation grains is arranged between the granulation step and the re-granulation step. |
