基于矿相结构与冶金性能的酸性球团质量综合评价  

Comprehensive evaluation of acid pellet quality based on mineralogical structure and metallurgical properties

作　　者：邸航 王永红 杜屏 冯根生[2] DI Hang;WANG Yong-hong;DU Ping;FENG Gen-sheng(Institute of Research of Iron and Steel,Shasteel,Zhangjiagang 215626,Jiangsu,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《中国冶金》2021年第1期9-13,共5页China Metallurgy

摘　　要：针对中国高炉冶炼沿用的"高碱度烧结矿+酸性球团+块矿"的炉料结构,立足于化学成分、微观矿相结构、物理性能及冶金性能,从多角度对5种进口酸性球团矿的质量进行综合评价。结果表明,北美酸球物理性能相对较好,转鼓指数分别为95.67%、95.55%;巴西酸球还原后的抗压强度普遍偏低,分别为282.8、347.6 N。巴西酸球主要以条状赤铁矿存在,铁相中不规则分布较多的孔洞;北美的K型高硅酸球矿晶发育良好;欧洲的U型酸球矿晶发育较差,赤铁矿结晶断裂严重,形成大量不规则气孔。巴西酸球还原膨胀指数较高,分别为24.21%、18.05%;V型酸球和C型酸球软化熔融区间适宜,料层对煤气流阻力较小,有利于还原气流顺行,冶金性能相对突出。因此,北美的C型酸球良好的冷态强度有利于长途储运,还原状态下的C型酸球膨胀系数较低且仍能保持较高的热态强度,熔融状态下的料柱对高炉煤气流阻力较小,符合中国高炉冶炼的炉料要求。The blast furnace burden charge of "high basicity sinter + acid pellets + lump ore" is widely used in Chinese steel enterprises. The quality of 5 imported acid pellets is comprehensively evaluated based on chemical composition, microstructure, physical properties and metallurgical properties. The results show that the physical properties of acid pellets in North America are relatively good, the drum index is 95.67 % and 95.55 %, respectively. The compressive strength of reduced Brazilian pellets is weaker, which is 282.8 N and 347.6 N, respectively. The main mineralogical constitution of Brazilian pellets is strip hematite with more irregular pores in the iron phase. The K-type acid pellets in North America own well-developed ore crystal. The ore crystal in U-type acid pellets was maldevelopment and seriously hematite crystal fracture caused too many irregular pores. The reduction expansion index of Brazilian acid pellets is higher, which is 24.21 % and 18.05 %, respectively. The metallurgical properties of V-type and C-type acid pellets are prominent, the cohesive zone and softening zone are relatively suitable, the resistance of the material layer to the gas flow is small, which is favorable for gas flow in BF. Combined with the experimental results, the C-type acid pellets are favorable for long-distance transportation and storage due to better compressive strength. The C-type acid pellets own nice thermal strength and lower expansion coefficient under reduction state. The resistance of gas flow is lower when passing through the BF burden charged with C-type acid pellets in the molten state, which can meet the requirements of BF smelting in China.

关 键 词：酸性球团矿 矿相结构 物理性能 冶金性能 综合评价 

分 类 号：TF046.4[冶金工程—冶金物理化学]