进口富矿粉液相流动行为试验研究

Experimental Research on Sintering Liquid Phase Fluidity Behavior of Imported Iron Ore

在烧结过程中,铁矿粉液相流动能力会对铁矿粉固结产生重要影响。采用铁矿石高温特性仪,对9种进口富矿粉液相流动性指数进行了测定,探究了富矿粉液相流动性影响因素,并对液相中气孔微观结构特征进行了解析。试验结果表明,富矿粉液相流动性受铁矿粉自身SiO_2、Al_2O_3含量以及配加CaO含量影响。基于此,提出了富矿粉液相流动性的化学成分控制因子。对液相中气孔微观结构研究表明,随着矿粉液相流动性提高,液相中气孔聚合程度提高,气孔圆度系数也随之增加。

In iron ore sintering process, iron ore liquid fluidity property has a critical impact on sinter quality. Liquid phase fluidity experiments of imported iron ore are carried out by using high temperature characteristic apparatus for iron ore. Influencing factors that affect liquid phase fluidity are elucidated and the characteristic of pore microstructure is also investigated. Results show that liquid phase fluidity of im- ported iron ore was mainly influenced by SiO2, Al2O3 content of iron ore and added CaO content. Based on this finding, chemical composition factor of liquid phase fluidity was put forward. Furthermore, microstruc- ture observation on pore in the liquid phase indicates that withthe increase of liquid phase fluidity, pore shows a higher degree of coalescing, and the roundness of pore structure is also improved.