The Variations of Compressive Strength of Containing Carbon Pellets Preheated Under Reducing Atmosphere

摘要

By simulating the temperature rising process of blast furnace interior, the compressive strengths of the pellets which were preheated to different temperatures under reducing atmosphere were measured, the compositions and microstructures of pellets at 900℃, 1,000℃ and 1,100℃ were also analyzed by XRD and SEM. When pellets heated to 900℃, nearly all Fe_2O_3 was reduced into Fe_xO, so the strength was minimum; at 1,000℃, a small amount of iron that formed small pieces of iron crystal appeared, so that the strength began to rise; when heated to 1,100℃, a large area of iron crystal was found, which formed iron framework, due to that the strength increased sharply. The reasons for compressive strength changes of pellets were analyzed.