外矿型烧结矿矿相结构与冶金性能的定量关系

 为了改善外矿型烧结矿的质量,对不同类型外矿为主要含铁原料的烧结矿的矿相结构进行了系统定量研究,分析了外矿对其矿相结构的影响规律,找出了烧结矿矿相特征与冶金性能的定量关系。研究结果表明,以斯特拉麦克粉和天发海超特粉为主要含铁原料(1号)的烧结矿,铁酸钙含量较多,以交织熔蚀结构为主,局部出现粒状-斑状结构,低温还原粉化率RDI_{>3.15 mm}较好,气孔率较高,转鼓指数较低。以纽曼粉、PB粉和杨迪粉为主要含铁原料(4号和5号)的烧结矿,5号烧结矿中赤铁矿含量较多,铁酸钙含量较低,以熔蚀-粒状结构为主,局部为共晶结构,转鼓指数最高,但低温还原粉化严重;4号烧结矿的纽曼粉和PB粉的含量较多,以交织熔蚀结构为主,局部出现粒状-斑状结构,转鼓强度较低。以纽曼粉和得宝麦克粉为主要含铁原料(2号和3号)的烧结矿,3号烧结矿铁酸钙含量最多,矿相结构较为均匀,以交织熔蚀结构为主,局部见针状铁酸钙交织他形赤铁矿,该烧结矿质量最好;2号烧结矿的纽曼粉和得宝麦克粉含量较高,矿物组成中赤铁矿含量多,铁酸钙含量少,以交织熔蚀结构为主,局部出现粒状-斑状结构,低温还原粉化严重。建议以纽曼粉为主,配加少量麦克粉、杨迪粉及超特粉做为主要含铁原料,以改善现场烧结矿质量。

Quantitative relation between mineralogical structure and metallurgical properties of sinter of import iron ore

In order to improve the quality of sinter of import iron ore,the mineralogical structure characteristics of sinters of different import iron ore were studied. The influence of import iron ore on the mineralogical structure was analyzed, and the quantitative relationship between the mineralogical characteristics and metallurgical properties of sinters was found. The results show that sinter (No.1) of Stramac ore powder and Tianfahai ultra-fine ore powder has more content of calcium ferrite, mainly interlaced corrosion structure, partially granular-patchy structure, and the low-temperature reduction disintegration index(RDI_{>3.15 mm}) is better; however, the tumbler index(TI) is low because of the high porosity. Sinters(No.4 and No.5) of Newman ore powder, PB ore powder, and Yangdi ore powder, sinter(No.5) contains more content of hematite and lower content of calcium ferrite, mainly with melting-granular structure, eutectic structure locally, the tumbler index(TI) is the highest, but the low-temperature reduction disintegration index(RDI_{>3.15 mm}) is bad; while the(No.4) sinter contains more content of Newman ore powder and PB ore powder mainly interlaced corrosion structure. Locally, the granular-patchy structure appeared, and the tumbler index was low. Sinters(No.2 and No.3) of Newman ore powder and Debao MAC ore powder, sinter(No.3) has the largest content of calcium ferrite, the mineralogical structure is more homogeneous, and the interlacing dissolution structure is the main part. The needle-like calcium ferrite interlaced the hematite of its shape, and the quality of the sinter is the best; while sinter (No.2) contain a higher content of Newman ore powder and Debao ore MAC powder, and the content of Hematite is high, but the calcium ferrite is low, the vitreous content is high, the interlaced corrosion structure is dominant, the granular-patchy structure appears locally, and its low-temperature reduction disintegration index(RDI_{>3.15 mm}) is bad. It is suggested that Newman ore powder,a small amount of MAC ore powder, Yangdi ore powder and super fine ore powder as the main iron-containing raw materials, which has improved the quality of the sinter.