Melt Absorbability of Iron Ore Nuclei and Its Influence on Suitable Liquid Content of Sintered Body

Sinter quasi-particles consist of nuclei particles and adhering fines. Therefore, reaction properties of the nuclei ore will ultimately affect the bonding strength of the sintered body. In this study, micro-sintering tests were conducted to explore the melt absorbability of nuclei ore and its effect on the suitable liquid content of the sintered body. The results showed that the melt absorbability is negatively correlated with the lowest assimilation temperature, and the most important mineralogy factor influencing melt absorbability is iron mineral type. The reaction behaviors of melts containing SiO2 or Al2O3 substrates are different, and the reaction process of the melt containing SiO2 is more complicated. In addition, the bonding strength of the sintered body is collectively determined by the liquid phase fluidity of adhering fines and the assimilability of nuclei ore. The high melt absorbability has an adverse effect on bonding strength, and it requires adhering fines to provide more primary melts to meet the requirements for sintered body bonding strength. In the condition with the same liquid content, for nuclei ore with stronger melt absorbability, an appropriate increase in the adhering fines ratio and reduction in segregation basicity are more conducive to improving the bonding strength.