碱度与BaO含量对保护渣理化性能的影响

doi:10.13228/j.boyuan.issn1005-4006.20220167

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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.

Key words： mold fluxes basicity BaO content lubrication heat transfer

Received: 31 October 2022

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	Articles by authors
	YAN Lixin
	DENG Birong
	LUO Gang
	QI Jianghua
	LIANG Liang
	WU Ting

Cite this article:

YAN Lixin,DENG Birong,LUO Gang等. Effects of basicity and BaO content on physicochemical properties of mold fluxes[J]. CONTINUOUS CASTING, 2023, 42(4): 10-16.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220167 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I4/10

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