Improving the Softening and Melting Properties of Ferrous Burden with High Al₂O₃ Content for Blast Furnace by Ore Blending

Abstract

In order to solve the problem of poor gas permeability of blast furnace caused by high Al 2 O 3 content in the burden, the softening and melting properties of sinter, pellets and lump ores are studied in this paper. The results show the differences between acid and basic iron ore materials. Based on this, this article study the influence of different kinds of pellets and lump ores blending with sinter on the softening and melting properties of comprehensive burdens. The results show that the self-fluxing pellet and porous lump ore with high aluminium content caused the Al 2 O 3 content of comprehensive burden to raise 0.26% compared to acid pellet and dense lump ore with low aluminium content. However, the highest pressure drop of comprehensive burden is reduced from 2.50 kPa to 1.70 kPa, the S-value is decreased from 198 kPa•°C to 114 kPa•°C. Therefore, this method of ore blending will improve the softening and melting properties of integrated burden.

Sequential Esterification—Diels-Alder Reactions for Improving Pine Rosin Durability within Road Marking Paint

“…The results indicated a range of softening points between 174 and 210 • C. Figure 5a shows that an increase in the rosin composition resulted in a decline in the softening point. It is worth noting that the desired softening point should be above 100 • C, with a preference for it to be above 130 • C. This preference exists because a higher softening point can increase the cohesive strength [36,37] of the binder, making the road marking paint suitable for high-temperature regions [38]. Additionally, conventional Indonesian road marking paint was tested, and the softening point was found to be 170 • C, which is the value nearest to that of the road marking paint at 26% rosin composition.…”

Effect of Sinter Reducibility on Softening-Melting-Dripping Behaviors of Burden: Sinter and Coke Layered Charging

“…The softening-melting and dropping characteristics of sinter determine the position and thickness of the cohesive zone as to affect the gas flow distribution, indirect reduction, and fuel consumption. 15,16) The effects of sinter with different properties on the softening and melting behaviors of the burden have been studied extensively. Tang et al 17) studied the effect of MgO content in sinter on the smelting mechanism of chromiumbearing vanadium-titanium magnetite.…”

Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces

“…63) Experimental condition can be controlled to simulate the performance of cohesive zone under different smelting, which can provide sufficient research space of researchers from all over the world. Hence a series of studies about the behavior of burden in cohesive zone have been reporting in the past two years, such as the comparison between sinter, olivine pellet and acid pellet, [64][65][66] the high temperature interaction between different charge, 67,68) the effect of certain content (C 2 S 69) ) or certain condition (pre-reduction degree, 70) atmosphere and basicity 71) ) on the phase formation, the properties of some special feed materials like high Al 2 O 3 content feed charge, 72) high titanium sinter, 46) and titanomagnetite ironsand coal composite hot briquette. 73) The cognition process of cohesive zone is a process of mutual support and cooperation of various methods.…”