| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace with which even in the case of increasing the blending ratio of crystallization water-containing ore, the deterioration of permeability in a shaft part and a fusion zone in the blast furnace can be suppressed and further, adjustment can be performed by the blast furnace operation process independently by using an index which can be measured at any time. SOLUTION: As a part of the iron source, the high crystallization water-containing ore containing ≥4 mass% crystallization water is used, and when the high crystallization water-containing ore is charged into the blast furnace, small and middle lump cokes having 5-40 mm grain diameter are mixed into the high crystallization water-containing ore with a mixing ratio h [mass%] satisfying a condition of 5≤h≤20. Then, these mixed materials are charged into the blast furnace and deposited in a region to a distance x [m] in the radial direction from the furnace wall to satisfy formula: x/R<0.3 (wherein R is the radius of the throat part of the blast furnace). COPYRIGHT: (C)2011,JPO&INPIT |
