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| Influence mechanism of basicity on strength of magnesium fluxed pellets |
| LIU Wei-xing1, LI Jie1, YANG Ai-min2, ZHANG Yu-zhu1, XIN Zi-cheng1 |
1. Modern Metallurgical Technique Key Laboratory of Ministry of Education, North China University of Science and Technology, Tangshan 063009, Hebei, China;
2. College of Science, North China University of Science and Technology, Tangshan 063009, Hebei, China |
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Abstract To investigate the influence mechanism of basicity on the strength of magnesium fluxed pellets, based on the raw materials of a steel plant in Tangshan city, using pelleting and roasting experiment, with the help of XRD, polarized light microscope, field emission scanning electron microscope analysis and Matlab software calculation analysis, the mechanism of the influence of alkalinity on the compressive strength of pellets is analyzed in depth from the aspects of pellet mineral composition, liquid phase formation, and microstructure, micromorphology and element distribution. The results show that with the increase of basicity, the compressive strength of the pellets increases. Hematite is the main crystal in pellets. The liquid phase is mainly composed of calcium ferrite, calcium silicate, and a little quartz. After the basicity is higher than 0.8, a small amount of magnesium ferrite appears in pellets. As the basicity increasing, the hematite content and liquid phase content increase, density increases, the pore become more uniform, and compressive strength increases of pellets. The Ca, Si, and Mg have the same distribution, Fe and O have the same distribution, and the two groups of elements′ distribution is complementary in pellets. As the basicity increases, the content of Ca, Si, and Mg elements increases, the content of the liquid phase increases, compressive strength increases of pellets. The analysis results of the two are consistent and have been mutually confirmed.
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Received: 17 June 2020
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2021, Vol. 56 
