Title:
METHOD FOR DETERMINING HIGH TEMPERATURE PROPERTIES OF IRON ORE PELLETS, METHOD FOR PRODUCING IRON ORE PELLETS, AND IRON ORE PELLETS
Document Type and Number:
WIPO Patent Application WO/2024/089903
Kind Code:
A1
Abstract:
A method for producing iron ore pellets according to one aspect of the present invention entails producing self-fusing iron ore pellets to be used in the operation of a blast furnace, and includes: a feedstock mixing step for mixing auxiliary feedstock including CaO and MgO into an ore feedstock such that the mass ratio of CaO/SiO2 is 0.8 or more and the mass ratio of MgO/SiO2 is 0.4 or more; a granulation step for granulating raw pellets from the mixed feedstock obtained in the feedstock mixing step; and an agglomeration step for imparting strength to the raw pellets. The temperature T1 shown in formula 1 is set to 1100°C or higher, or the temperature T2 shown in formula 2 is set to 1350°C or higher. T1 = 1155 - 0.095 × Po2 + 15 × FeO0.5
T2 = 220 × C/S + 13.1 × M/S - 23.13 × TFe + 2600
Po is the porosity (%) of the iron ore pellets, FeO is the percentage (mass%) of FeO, C/S is the mass ratio of CaO/SiO2, M/S is the mass ratio of MgO/SiO2, and TFe is the total percentage (mass%) of iron content.
Inventors:
MORIOKA KOICHI
KAJIYAMA YUKI
KATO TSUGUNORI
TAKIGUCHI YUTA
KAJIYAMA YUKI
KATO TSUGUNORI
TAKIGUCHI YUTA
Application Number:
PCT/JP2022/043576
Publication Date:
May 02, 2024
Filing Date:
November 25, 2022
Export Citation:
Assignee:
KK KOBE SEIKO SHO KOBE STEEL LTD (JP)
International Classes:
C22B1/16; C21B5/00; C22B1/14
Attorney, Agent or Firm:
IKEDA Yoshinori (JP)
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