Correlating mechanical properties of sinter phases with their chemistry and its effect on sinter quality

Abstract

In this study, pot sinter tests were carried out to study the sintering properties of iron ores of different alumina (2-4-6%) level. It was observed that the 6% alumina level ores have a higher RDI values and decreased tumbler index (TI) compared to its other two counterparts. It was observed that an increase in composite fracture toughness (CFT) of sinter improves the Tumbler as well as RDI of the sinter. Beyond 4 CFT there is remarkable improvement in TI, RDI and RI values. The mechanical strength parameters of sinter phases were further correlated and analysed with respect to the chemistry of sinter and mineralogy of sinter phases. There is strong evidence which suggests that the Al 2 O 3 deteriorates the strength of the phases by making them hard and thus generating cracks in them. Unlike alumina, CaO and SiO 2 tend to stabilise and improve the strength of the phase.

Synthesis and Mechanical Testing of Calcium Aluminosilicoferrite Crystals with High Alumina Content

“…Compared with the results from earlier studies [18][19][20][21][22], this work provides a new view on the determination of mechanical properties. The obtained data are difficult to compare with classical Vickers microhardness, but on the other hand, the values were obtained with an accurate method allowing for rigorous comparison with the future examination of mechanical properties of sinter phases.…”

“…In most cases the hardness was measured using Vickers microindentation. However, there are some elementary problems with these measurements, such as too little information about the elastic constants or insufficient size of the crystals, so that the surrounding phases influence the measurements [18][19][20][21][22]. For this reason, in this study SFCA phases were synthesized in the laboratory to attain grain sizes of tens of micrometers, for which the mechanical properties can be quantified using advanced mechanical testing such as nanoindentation.…”

Effect of Thermodynamic Melt Formation Characteristics on Liquid Phase Fluidity of Iron Ore in the Sintering Process

“…However, for the practical sintering process, it is very complex, the sintering temperature is relatively low, the bonding phase is identified as a solid-liquid coexistence phase, and the measurement of mixed phase viscosity is relatively cumbersome [19]. The FactSage software can be used to calculate the liquid phase content and the viscosity of the pure liquid phase; then, the viscosity of the mixed phase can be obtained by Equation (2).…”

“…Sinter is the main raw material for blast furnace ironmaking in China, and the quality of the sinter directly affects the stable operation of blast furnace ironmaking [1] and the economic and technical indexes [2,3]. Therefore, improving the yield and quality of sinter is of great practical significance for an energy-saving and efficient ironmaking process.…”

Effect of SiO2 on the Mechanical Property and Reduction of Calcium Ferrite

“…The SFCA phase (SiO 2 -Fe 2 O 3 -CaO-Al 2 O 3 ) is regarded as a desirable bonding phase for fluxed sinter [1,2]. Silica content influences the phase composition and bonding phase mass of SFCA because of their low melting point [3,4], high mechanical strength [5][6][7][8], and SFCA is an important part of the point of view of saving cost and energy from low temperature sinter. SiO 2 -Fe 2 O 3 -CaO (SFC) is believed to be the transition phase during the SFCA formation process and has been widely investigated [9][10][11].…”