| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for charging raw material into a bell-less blast furnace by which, when ore and coke are mixed and charged into the bell-less blast furnace having a center-feed type raw material charging apparatus, a radial-direction distribution of the coke in the coke-mixed ore layer becomes uniform and mixability of the coke becomes good after charging the raw material into the furnace, considering discharge mixing ratio characteristic in a furnace-top bunker and segregation phenomenon after charging. SOLUTION: In the method for charging the raw material into the bell-less blast furnace, the particle diameter of the coke 2 mixed in the coke-mixed ore layer is controlled to be 0.2 times or more the particle diameter of lump coke charged as a coke-layer and <1.3 times the particle diameter of the ore 1, and in order to form the above coke-mixed ore layer, the ore is charged in an upper bunker 7, successively the ore and the coke are charged therein, then the raw material in the upper bunker 7 is charged into a lower bunker 8 and the raw material discharged from the lower bunker 8 is charged into the blast furnace 9 through a pivoted chute 10. COPYRIGHT: (C)2010,JPO&INPIT |
