| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace with which in the blast furnace operation using sintered ore together with pellet as the iron-ore raw material, in the case of changing the pellet-blending ratio, the molten iron S can surely be kept to the low level. SOLUTION: In the method for operating the blast furnace, in which the iron-ore raw material composed of the pellet, the sintered ore and lump ore, and coke are alternately charged so as to forma layers; in the case of raising the blending ratio of the pellet in the iron-ore raw material (in the following, [pellet blending ratio]), the charging quantity of MgO into the blast furnace (in the following, [charged MgO quantity into the blast furnace]) is increased, and in the case of lowering the pellet blending ratio, the charged MgO quantity into the blast furnace is reduced. To 1 mass% of the changing quantity of the pellet blending ratio, it is desirable to change the charged MgO quantity into the blast furnace by 0.2-0.8 kg per 1 ton of the molten iron. It is more desirable to adjust the increase and the decrease of the changed MgO quantity into the blast furnace in the range of≥1 mass% of MgO content in the pellet. COPYRIGHT: (C)2011,JPO&INPIT |
