| Effects of SiO2 on the preparation and metallurgical properties of acid oxidized pellets |
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| 作者姓名： | Jian-guang Lu Chen-chen Lan Qing Lyu Shu-hui Zhang Jian-ning Sun |
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| 作者单位： | School of Metallurgy,Northeastern University,Shenyang 110819,China;HBIS Group Hansteel Company,Handan 05600,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,China |
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| 基金项目： | This work was financially supported by the Key Program of the National Natural Science Foundation of China;and the Natural Science Foundation of Hebei Province of China |
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| 摘 要： | The effects of SiO2 content on the preparation process and metallurgical properties of acid oxidized pellets, including compressive strength, reduction, and softening–melting behaviors, were systematically investigated.Mineralogical structures, elemental distribution, and pore size distribution were varied to analyze the mechanism of the effects.The results show that with an increase in SiO2 content from 3.51 wt%to 7.18 wt%, compressive strength decreases from 3150 N/pellet to 2100 N/pellet and reducibility decreases from 76.5% to 71.4%.The microstructure showed that pellets with high SiO2 content contained more magnetite in the mineralogical structures.Additionally, some liquid phases appeared, which hindered the continuous crystallization of hematite.Also, the softening–melting properties of the pellets clearly deteriorated as the SiO2 content increased.With increasing SiO2 content, the temperature range of the softening–melting zone decreased, and the maximum differential pressure and the comprehensive permeability index increased significantly.When acid oxidized pellets are used as the raw materials for blast furnace smelting, it should be combined with high basicity sinters to improve the softening–melting behaviors of the comprehensive charge.
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| 关 键 词： | acid oxidized pellets SiO2content metallurgical property mineralogical structure |
Effects of SiO2 on the preparation and metallurgical properties of acid oxidized pellets |
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| Jian-guang Lu,Chen-chen Lan,Qing Lyu,Shu-hui Zhang,Jian-ning Sun.Effects of SiO2 on the preparation and metallurgical properties of acid oxidized pellets[J].International Journal of Minerals,Metallurgy and Materials,2021,28(4):629-636. |
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| Authors: | Jian-guang Lu Chen-chen Lan Qing Lyu Shu-hui Zhang Jian-ning Sun |
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| Abstract: | The effects of SiO2 content on the preparation process and metallurgical properties of acid oxidized pellets, including compressive strength, reduction, and softening–melting behaviors, were systematically investigated. Mineralogical structures, elemental distribution, and pore size distribution were varied to analyze the mechanism of the effects. The results show that with an increase in SiO2 content from 3.51wt％to 7.18wt％, compressive strength decreases from 3150 N/pellet to 2100 N/pellet and reducibility decreases from 76.5％ to 71.4％. The micro-structure showed that pellets with high SiO2 content contained more magnetite in the mineralogical structures. Additionally, some liquid phases appeared, which hindered the continuous crystallization of hematite. Also, the softening–melting properties of the pellets clearly deteriorated as the SiO2 content increased. With increasing SiO2 content, the temperature range of the softening–melting zone decreased, and the maximum differential pressure and the comprehensive permeability index increased significantly. When acid oxidized pellets are used as the raw materi-als for blast furnace smelting, it should be combined with high basicity sinters to improve the softening–melting behaviors of the comprehens-ive charge. |
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| Keywords: | acid oxidized pellets SiO2 content metallurgical property mineralogical structure |
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