Abstract
The article gives a brief description of the phase components of iron ore sinter. The features of the formation of its microstructure with the use of magnesium materials of different mineralogical composition are indicated. The interrelation between the phase composition of the sinter and its strength characteristics has been established. Thus, the strength characteristics of the sinter are improved with a decrease in the amount of silicate ligament (and dicalcium silicate), an increase in the content of acicular (or columnar) ferrites and aluminosilicoferrites.
It is shown that the mineralogical composition of the magnesium additive affects the mechanisms of formation of the microstructure of the agglomerate, and, consequently, its strength properties. Comparison of sinters of the same chemical composition showed that when using sideroplecites in the samples under study, a high content of dicalcium silicate is observed, and in the case of the addition of serpentine (magnesium silicate) solid solutions of ferro-okermanite predominate, providing high strength of magnesum sinter.
Keywords
Sinter, microstructure, magnesium oxide, magnesia additives, strength, dicalcium silicate, mineral formation mechanism.