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| Reduction behavior of iron-bearing burdens in hydrogen-rich stream |
| WANG Yu, HE Zhi-jun, ZHAN Wen-long, ZHU Hao-bin, ZHANG Jun-hong, PANG Qing-hai |
| School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China |
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Abstract The Low carbon and hydrogen-rich smelting technology of the blast furnace, such as pulverized coal injection and hydrogen-rich fuel injection, will lead to the increase of hydrogen content in the bosh gas of blast furnace. In order to explore the influence of hydrogen-rich on the upper burden of blast furnace, the reduction behavior of different iron-containing burdens under the condition of hydrogen-rich is studied. The pulverization experiment found that under the condition of 20%H2(volume percent), the pulverization rate of lump ore and sinter is obviously improved, and RDI>3.15 mm is increased by 11.08% and 30.23% respectively. At the same time, the condition of rich hydrogen is conducive to the homogenization of iron-containing burdens. The reduction experiment shows that under the condition of constant CO volume percent and changing the content of H2, the H2 volume percent of pellet and sinter is 25% at the highest reduction degree, and that of lump ore is 10%. When the volume percent of (CO+H2) is kept at 30% and the amount of H2 is changed, when the volume percent of H2 is more than 20%, the reduction degree of each iron-containing burdens is more than 90%. The results of SEM analysis show that the reduced block ore obviously produces slag and iron phase, the pellet ore presents good hematite and magnetite phase, and the acicular calcium ferrite phase-magnetite phase-iron phase appeared in the sinter.
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Received: 11 October 2019
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2020, Vol. 55 
