Research on Microstructural Characteristics and Metallurgical Properties of the High Basicity Sinter Made of Magnetite
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摘要: 采用偏光显微镜对两种高碱度磁铁矿型烧结矿的显微结构进行了定量研究，并结合冶金性能测试，探讨了烧结矿显微结构对其冶金性能的影响规律。结果表明，两种烧结矿（1#和2#）均主要由抗压强度较好的磁铁矿、赤铁矿和铁酸钙等矿物组成，具有良好且相似的转鼓指数。1#烧结矿的显微结构较均匀，交织熔蚀—熔蚀结构所占比例高达90%以上；2#烧结矿结构相对不均匀，由65%的交织熔蚀结构、30%的粒状结构组成和5%的骸晶结构等组成；骸晶状、粒状赤铁矿的大量发育和结构的不均匀性，致使2#烧结矿抗低温还原粉化的能力明显较1#烧结矿弱。2#烧结矿的还原性却略好于1#烧结矿，这与2#烧结矿显微结构以大气孔为主，且气孔率高达30%有关。Abstract: 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%.
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