1. College of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning， China； 2. Zhangdian Iron and Steel Company, Zibo 255007, Shandong， China
Abstract：Blast furnace dust contains a great deal of iron and carbon, and it causes serious pollution without disposal, thus it may be an effective disposal method to inject the dust back into the blast furnace using the popular pulverized coal injection equipment. Considering the possible change of slag basicity, sulfur content in hot metal, theoretical combustion temperature, and coke ratio inside the furnace with dust injection, a mass balance and local heat balance model was developed to calculate the change of coke ratio, slag basicity and theoretical combustion temperature with dust injection which provides theoretical basis for blast furnace operation and industrial test was carried out to confirm the idea and model. The results show that, with the increase of dust injection rate, the coke ratio and slag basicity decreased significantly while the theoretical combustion temperature did not change very much, and these changes could be handled by adjusting the ratio of sinters to pellets. Besides, with the increase of dust injection rate, the permeability of blast furnace decreased a little and blowing pressure was increased. In general, blast furnace dust injection into blast furnace is feasible.
2008, Vol. 43 
