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| Structural transformation of converter slags during #br# early stage of smelting process |
| ZHANG Rui1,2，MIN Yi1,2，WANG Yu1,2，LIU Chengjun1,2 |
(1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education)， Shenyang 110819，
Liaoning， China；2. School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China) |
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Abstract In order to understand the importance of the effect of the slag structure composition on the design of converter slag and the rationalizing of the physical property of the smelting process better, the chemical composition of the molten slag during the early stage of the converter steelmaking process was simulated. Then, the melt structure of CaOSiO2FexO slag was investigated by the Raman spectroscopy, and the existing forms and transformational behaviors of structural units in the molten slag were further analyzed. The results show that the basicity of the molten slag increases with the converter steelmaking proceeding. Plenty of free oxygen ions are released by the elevating basicity, which depolymerizes complex silicate structures. The depolymerization process is Q3→ Q2→ Q1→ Q0, resulting in the reduction of the polymerization degree of the molten slag with the smelting time. Meanwhile, as the converter smelting proceeds, the ［FeO6］9- octahedron was gradually replaced by the ［FeO4］5- tetrahedron due to the decreasing of the Fe3+/∑Fe in the slag.
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| [1] |
DONG Wen-liang, PAN Hong-wei, LUO Lei, JI Chen-xi, LI Hai-bo, TIAN Zhi-hong. Phosphorous distribution in dephosphorization slag[J]. Iron and Steel, 2020, 55(2): 75-81. |
| [2] |
HUANG Bing,ZHU Ming-mei,ZHONG Yong,ZHANG Ai-ping,WANG Yu. Thermodynamic calculation of phase composition of CaOSiO2FeOCr2O3MgOMnO slag system[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(8): 718-725. |
| [3] |
XUE Peng，HE Dong-feng，XU An-jun，YANG Qi-xing，. Formation of MgFe2O4 and recycling of iron from modified BOF slag by magnetic separation[J]. Iron and Steel, 2017, 52(7): 104-108. |
| [4] |
WANG Yi- ci,LI Hai- yang,LI Shuang- wei,LUO Guo- ping. Thermodynamic analysis and experiment on gasification dephosphorization reaction of converter slag[J]. Chinese Journal of Iron and Steel, 2016, 28(6): 31-34. |
| [5] |
ZHAO Cheng-lin，ZHANG Ning，KANG Lei，CAO Dong，LI Guang-bang. Experiments on dephosphorization of BOF slag by carbothermal reduction[J]. Iron and Steel, 2016, 51(5): 41-44. |
| [6] |
YU Ji-peng,WANG Li-jun,,WANG Ya-xian,LIU Yan-qiang,ZHOU Guo-zhi,. Effect of Fe2+ and Fe3+ on the Properties of Melts Containing FeOx[J]. Chinese Journal of Iron and Steel, 2014, 26(10): 1-8. |
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