ABSTRACT

In order to explore the mechanism of hydrogen-rich blast furnace on improving the reduction behaviour of fluxed pellets, the isothermal reduction experiments of fluxed pellets in CO-CO₂-N₂ and CO-CO₂-H₂-H₂O-N₂ atmosphere were studied. The results show that the condition of hydrogen-rich blast furnace at 900°C has a significant effect on improving the reduction degree of fluxed pellets. It is helpful to increase the reduction rate of fluxed pellets at 1000~1100°C. The phenomenon of "reduction stagnation" at 800°C is due to the metallic iron layer formed on the periphery of the fluxed pellets, which hinders the entry of reducing gas. The morphological observation of the reduction products showed that the grid-like metallic iron structure is the key factor to improve the reduction rate and reduction degree of fluxed pellets in CO-CO₂-H₂-H₂O-N₂. Finally, the reduction mechanism of flux particles in hydrogen-rich blast furnace is summarized.

摘要

为探究富氢高炉提高熔剂球团还原行为的机理，进行了熔剂球团在CO-CO ₂ -N ₂和CO-CO ₂ -H ₂ -H ₂ O-N _{2中的等温还原实验。}气氛进行了研究。结果表明，900℃富氢高炉条件对提高熔剂球团还原度有显着影响。在 1000~1100°C 有助于提高助焊剂颗粒的还原率。800℃时出现“还原停滞”现象，是由于在熔丸的外围形成了金属铁层，阻碍了还原气体的进入。还原产物的形貌观察表明，网状金属铁结构是提高熔剂球团在CO-CO ₂ -H ₂ -H ₂ O-N ₂中还原率和还原度的关键因素。最后总结了富氢高炉熔剂颗粒的还原机理。