Abstract
As for ferrous burden, the softening and melting (SM) behaviors greatly affect the cohesive zone thickness, position and shape. Ironmaking researchers have found that it’s not appropriate to evaluate the blast furnace burdens only based on the SM behavior of single iron-bearing materials because the sinter will interact with acid materials at high temperatures. In present study, a new visual method has been given to research the SM behavior of five single iron ores and four types of mixed burdens. The results show that the SM properties of all iron ores in the cohesive zone (CZ) are enhanced through interactions at high temperature. Due to intense interaction at high temperature, SM behavior of the mixture burden A (containing lump ore L-A and sinter) is better than the mixture burden B (containing lump L-B and sinter), despite the lump ore L-A SM behavior is remarkably reduced compared with the lump ore L-B. Additionally, experimental results for melting and dropping of integrated burdens also prove that high temperature interaction is important for enhancing the performance of SM in ferrous materials and improving the permeability of the blast furnace.
