| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an agglomerate for a blast furnace raw material, in which an agglomerate for a blast furnace raw material having high strength can be produced even if coal hardly having softening and melting properties is used. SOLUTION: Powdery coal A having the maximum fluidity MF of≤3DDPM and containing a volatile matter VM of≥10 mass%, and powdery iron ore B comprising crystallization water LOI of≥3 mass% are subjected to cold-mixing by a mixer 1 to obtain a mixed raw material C, in such a manner that the average particle diameter d<SB>50</SB>(Do) of the powdery iron ore B is controlled to 5 to 50μm, and also, the ratio between the average particle diameter d<SB>50</SB>(Do) of the powdery iron ore and the average particle diameter d<SB>50</SB>(Dc) of the powdery coal A, Do/Dc is controlled to 0.1 to 2.0. This mixed raw material C is thereafter heated at 250 to 550°C by a heating machine 2, the heated mixed raw material C' is hot-molded by a hot molding machine 4 to produce a molding D, and this molding D is subjected to heating treatment at 560 to 750°C by a heat treatment device 5 so as to produce an agglomerate E for a blast furnace raw material. COPYRIGHT: (C)2011,JPO&INPIT |
