2015 Volume 55 Issue 4 Pages 742-750
The structure of sinter composes of a melt zone and unfused ores. Sinter strength is mainly subjected to the properties of melt zone since unfused ores are wrapped by melt zone is proposed. It facilitates obtaining sinter of high strength with the increase of liquid phase generated in melt zone and the formation of columnar & acicular SFCA (calcium ferrite containing silicate and alumina) during melt condensation. The mineralization behaviors show that, when Ca/Fe (molar ratio) in melt zone is 0.3–0.4, the content of SiO2 (mass ratio) is about 5%, Al2O3 is less than 1.8% and MgO is as low as possible, it would benefit the generation of liquid phase and columnar & acicular SFCA. Research of optimizing ore blending indicates that, as the chemical components in melt zone satisfies the conditions of mineralization, the yield and tumbler strength of sinter can be improved, and the solid fuel consumption can be reduced.