Crystallization behavior of blast furnace slag modified by adding iron ore tailing |
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Authors: | Qian-qian Ren Yu-zhu Zhang Yue Long Shao-sheng Chen Zong-shu Zou Jie Li Chen-guang Xu |
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Affiliation: | 1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China;State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081, China;2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China;College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, Hebei, China;3. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, Hebei, China;4. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract: | Blast furnace (BF) slag is a by-product of the ironmaking process and could be utilized to manufacture slag fiber by adding iron ore tailing.The crystallization behavior of the modified BF slag is significant to the fi-brosis process.To investigate the influence of basicity on the crystallization behavior, BF slag was modi-fied by adding iron ore tailing at room temperature and melted at 1500℃.FactSage simulation, X-ray dif-fraction, scanning electron microscopy backscattered electron imaging coupled to an energy dispersive spectrometer, and hot thermocouple technique analysis were performed to explore the crystallization be-havior of the modified BF slag during the cooling process.It was found that the initial crystallization tem-perature increased with the increase in basicity.Melilite, anorthite, clinopyroxene, and wollastonite could be generated during the cooling process as basicity ranged from 0.7 to 0.9.Spinel could be found as one of the phases; however, wollastonite disappeared under a basicity of 1.0.The initial crystallization tempera-ture was controlled by the crystallization of melilite during the cooling process when the basicity of the modified BF slag ranged from 0.7 to 1.0.Moreover, the cooling rate could also influence the crystalliza-tion of the modified BF slag. |
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Keywords: | Crystallization behavior Modified blast furnace slag Basicity Initial crystallization temperature Iron ore tailing |
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