Improving the Softening and Melting Properties of Ferrous Burden with High Al_2O_3 Content for Blast Furnace by Ore Blending

摘要

In order to solve the problem of poor gas permeability of blast furnace caused by high Al_2O_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_2O_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.