Effect of aluminum oxide on the compressive strength of pellets
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第4期
论文作者：Jian-liang Zhang Zhen-yang Wang Xiang-dong Xing Zheng-jian Liu
文章页码：339 - 344
摘 要：Analytical-reagent-grade Al2O3 was added to magnetite ore during the process of pelletizing, and the methods of mercury intrusion, scanning electron microscopy, and image processing were used to investigate the effect of Al2O3 on the compressive strength of the pellets. The results showed that, as the Al2O3 content increased, the compressive strength of the pellets increased slightly and then decreased gradually. When a small amount of Al2O3 was added to the pellets, the Al2O3 combined with fayalite（2FeO·SiO2） and the aluminosilicate（2FeO·2Al2O3·5SiO2） was generated, which releases some iron oxide and reduces the inhibition of fayalite to the solid phase of consolidation. When Al2O3 increased sequentially, high melting point of Al2O3 particles hinder the oxidation of Fe3O4 and the recrystallization of Fe2O3, making the internal porosity of the pellets increase, which leads to the decrease in compressive strength of the pellets.
Jian-liang Zhang，Zhen-yang Wang，Xiang-dong Xing，Zheng-jian Liu
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing
摘 要：Analytical-reagent-grade Al2O3 was added to magnetite ore during the process of pelletizing, and the methods of mercury intrusion, scanning electron microscopy, and image processing were used to investigate the effect of Al2O3 on the compressive strength of the pellets. The results showed that, as the Al2O3 content increased, the compressive strength of the pellets increased slightly and then decreased gradually. When a small amount of Al2O3 was added to the pellets, the Al2O3 combined with fayalite（2FeO·SiO2） and the aluminosilicate（2FeO·2Al2O3·5SiO2） was generated, which releases some iron oxide and reduces the inhibition of fayalite to the solid phase of consolidation. When Al2O3 increased sequentially, high melting point of Al2O3 particles hinder the oxidation of Fe3O4 and the recrystallization of Fe2O3, making the internal porosity of the pellets increase, which leads to the decrease in compressive strength of the pellets.
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