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Zou, Yongshun; Chen, Ding; Cao, Jianlei; Xiao, Qiaoling; Huang, Ao; Gu, Huazhi; Fu, Lvping; Yang, Shuang
Ceramics international, 09/2024, Letnik: 50, Številka: 18Journal Article
The interaction between refractories and molten steel in tundish has significant influence on quality of steel. The calcined dolomite and fused magnesia were adopted as raw materials to prepare MgO–CaO based refractories for tundish. Then the reaction behavior between refractories with different contents of calcined dolomite and molten steel was investigated. After reaction with different refractories at 1550 °C for 90 min, the total O and P in steels reduced by 33.9 % and 77 % respectively when increasing calcined dolomite from 0 to 60 wt%, the average size and area proportion of inclusions decreased from 4.92 μm and 9.98 ‰ to 2.47 μm and 4.73 ‰ respectively. Inclusions of FeO wrapped by FeO–P2O5–MnS translated to FeO coated by FeO–MnS. The CaO introduced by calcined dolomite could reduce the increase of oxygen to molten steel owing to better thermodynamic stability compared with MgO. Meanwhile, CaO could absorb P to form Ca3(PO4)2 on the surface of calcined dolomite particles, which was beneficial for dephosphorization of molten steel.
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