| Autor: |
Ju, Jian-tao, Tang, Chen-mei, Ji, Guang-heng, Xing, Xiang-dong, Zhao, Gui-qing, Jiang, Xin-tai, Lu, Feng-lin |
| Zdroj: |
Journal of Iron and Steel Research International; 20210101, Issue: Preprints p1-10, 10p |
| Abstrakt: |
Iron ore containing BaSO4may have a series of effects on the quality of the sinter and performance of the blast furnace. Thus, the effect mechanism of BaSO4(0–6.0 mass%) on the compressive strength, mineral composition, and microstructure of the sinter was investigated. The experimental results show that the compressive strength of the sintered samples initially increases and then decreases when the BaSO4content increases from 0 to 6.0 mass%, reaching a peak value of 12.78 kN with a BaSO4content of 1.0 mass%. Thermal analysis indicates that BaSO4initially decomposes to produce BaO at 1468 K in the presence of iron ore. BaO combines with Fe2O3forming barium ferrite (Ba2Fe6O11), which exists in the sintered sample with a granular form. BaO also dissolves in calcium ferrite and slag to promote the formation of calcium ferrite and barium glass, respectively. The content of needle-like calcium ferrite gradually increases and then decreases with the increase in BaSO4content. Hematite exists in a plate-like form. The generation of dicalcium ferrite is promoted by increasing the BaSO4addition from 2.0 to 6.0 mass%. |
| Databáze: |
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