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Effects of basicity and BaO content on physicochemical properties of mold fluxes |
YAN Lixin1, DENG Birong1, LUO Gang1, QI Jianghua1, LIANG Liang1, WU Ting2 |
1. Valin Lianyuan Iron and Steel Co.,Ltd.,Loudi 417000,Hunan,China; 2. School of Metallurgical Engineering, Anhui University of Technology,Maanshan 243032,Anhui,China |
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Abstract In order to obtain the composition range of mold fluxes with high crystallization and high lubrication, which is suitable for the production of thin slab with high speed, the effects of basicity and BaO content on physicochemical properties of mold fluxes were studied by combining rotating viscosimeter, four-probe conductivity tester, hemisphere point melting point tester and X-ray diffraction analyzer. The results show that, when the basicity of mold fluxes increases, the melting point, breaking temperature, initial crystallization temperature and crystallization ratio all decrease first and then increase, while the high temperature viscosity changes little. The breaking temperature and crystallization ratio reach the lowest values when the basicity is 1.65 and 1.55, respectively. The precipitation of cuspidine Ca4Si2O7F2 decreases, while that of Ca5MgSi3O12 and CaF2 phases increases. When the BaO content increases in mold fluxes with the same basicity, the melting point decreases and the high temperature viscosity fluctuates slightly, while the breaking temperature decreases first and then increases with the valley corresponding to 6% BaO (mass fraction). In addition, the initial crystallization temperature decreases, and closed to breaking temperature gradually. Overall, the mold flux with basicity of 1.65 and BaO (mass fraction) of 6% is most conductive to the coordinated control of lubrication and heat transfer.
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Received: 31 October 2022
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