METHOD FOR PRODUCING SINTERED ORE, METHOD FOR PRODUCING MATERIAL FOR SINTERING, GRANULATED PARTICLE, AND SINTERED ORE

摘要

A method for producing a sintered ore (50a) which comprises forming, on the surface of a nucleus particle (51) containing an iron ore, a first coating layer (52) using an iron- containing substance and optionally an SiO2-containing material, and subsequently a second coating layer (53) using limestone and a solid fuel based material, to prepare a granulated particle (50), and then sintering the granulated particle (50), wherein the iron-containing substance used for forming the first coating layer (52) has a porosity of 20 % or less or has a porosity of 20 % or less and a content of Al 2O3 of 2.1 mass % or less, and wherein the iron ore for the nucleus particle has a porosity higher than that of the iron-containing substance used for the first coating layer (52) or has a porosity and/or a content of Al2O3 higher than that or those of the iron-containing substance.