Research on Microstructural Characteristics and Metallurgical Properties of the High Basicity Sinter Made of Magnetite

The microstructures of two kinds of high basicity sinters made of magnetite were studied quantitatively by means of polarization microscope,and their metallurgical properties were tested.The influence of microstructure of sinter on its metallurgical properties was discussed.The results show that both sinters（1^# and 2^#） are mainly composed of magnetite,hematite and calcium ferrite with good compressive strength,thus they have good and similar drum index.The sinter 1^# has the uniform microstructure in which interlaced erosion and erosion structure accounts for more than 90%.The sinter 2^# has the inhomogeneous microstructure,consisting of 65% interlaced erosion,30% granular structure and 5% skeletal structure.The sinter 2^# has obviously lower reduction pulverization index compared with sinter 1^#,since the former has large amount of skeletal and granular hematite and the inhomogeneous microstructure.The reducibility of sinter 2^# is slightly better than that of sinter 1^#,which is related to the macro-porous structure,as its the porosity is as high as 30%.