硫含量对白云鄂博铁精矿球团显微结构及抗压强度的影响  

Effect of sulfur content on microstructure and compressive strength of Baiyunebo iron ore concentrate pellet

作　　者：张红强[1] 张婧[1] 罗果萍[1] 辛文彬[1] 朱建国[1] Zhang Hongqiang;Zhang Jing;Luo Guoping;Xin Wenbin;Zhu Jianguo(School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《烧结球团》2018年第3期52-57,62,共7页Sintering and Pelletizing

基　　金：国家自然科学基金资助项目(51364030)

摘　　要：氧化焙烧工艺可以有效脱除白云鄂博铁精矿中的有害元素硫,满足成品球团对硫含量的要求,但同时对其冶金性能造成不利影响,限制了球团矿在高炉原料中的配加比例。本文在热力学分析的基础上,研究了硫含量对焙烧后压团矿显微结构和抗压强度的影响规律。结果表明:矿物中硫元素的主要存在形式为黄铁矿和磁黄铁矿,各占34.48%、64.23%;当硫含量由1.8%增加到3.9%时,成品压团中磁铁矿含量由8.94%增加到24.85%,赤铁矿含量由44.48%降低到17.09%,液相量由9.64%增加到13.85%,孔隙率由36.94%增加到44.21%,压团强度由18.66 k N降低为12.47 k N,并解释了压团抗压强度随硫含量增加而降低的微观机理,为实际生产改善球团矿的显微结构、抗压强度提供了必要的理论依据。The oxidizing roasting process can effectively remove the harmful elements S in the Baiyunebo iron ore concentrate and meet the requirement of sulfur content in product pellets. However, the sulfur content is detrimental to the metallurgical properties and restrains the proportion of pellets in the raw material of blast furnace. Based on thermodynamic analysis, the laws of effect of sulfur content on microstructure and compressive strength of pellets after roasting were studied. The results show that, the sulfur in minerals exists in the form of pyrite and pyrrhotine, accounting for 34.48 % and 64.23 % respectively. When the sulfur content is increased from 1.8 % to 3.9 %, the content of magnetite in product pellets increases from 8.94% to 24.85 %, the hematite content decreases from 44.48% to 17.09%, the liquid phase increases from 9.64% to 13.85%, the porosity from 36.94% to 44.21%, and the pellet strength is reduced from 18.66 kN to 12.47 kN. The micro- mechanism is explained that the compressive strength of pellets decreases with the increase of sulfur content, which provides necessary theoretical basis for improvement of the microstructure and compressive strength of the pellets in actual production.

关 键 词：白云鄂博铁精矿 氧化焙烧 脱硫热力学 显微结构 抗压强度 

分 类 号：TF046.6[冶金工程—冶金物理化学]