2014 Volume 54 Issue 9 Pages 2089-2096
The primary-slags formation behaviors of sinter, lump ores and integrated burdens were studied to explore the high temperature interaction between sinter and lump ores in blast furnace. The results showed that the softening and melting properties of lump ores, viscosity and fluidity index of primary-slags of lump ores would be improved by the high temperature interaction. Particularly, the high temperature interaction was influenced by the chemical composition and porosity of iron ore samples. The high temperature interaction between sinter and lump ore L-2 (a typical limonite lump ore from Australia) was much stronger. Though the high temperature properties of lump ore L-2 was much worse than lump ore L-1 (a typical hematite lump ore from South Africa), the high temperature properties of integrated burden B (consist of sinter and lump ore L-2) was not worse than that of integrated burden A (consist of sinter and lump ore L-1) due to the strong high temperature interaction. In addition, the suitable MgO/Al2O3 weight ratio was calculated based on the assumption that the only phases of slags were akermanite and gehlenite, which showed a decreasing tend with the increase of CaO/SiO2 weight ratio.