Effect of borax on microstructure and viscosity of fluorine-free mold fluxes containing titanium-bearing blast furnace slag

LIU Lei; HAN Xiuli; ZHANG Di; LIU Ziyao; GUO Jingjing

doi:10.7513/j.issn.1004-7638.2025.02.020

Volume 46 Issue 2

May 2025

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LIU Lei, HAN Xiuli, ZHANG Di, LIU Ziyao, GUO Jingjing. Effect of borax on microstructure and viscosity of fluorine-free mold fluxes containing titanium-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(2): 142-150, 117. doi: 10.7513/j.issn.1004-7638.2025.02.020

Citation:

LIU Lei, HAN Xiuli, ZHANG Di, LIU Ziyao, GUO Jingjing. Effect of borax on microstructure and viscosity of fluorine-free mold fluxes containing titanium-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(2): 142-150, 117. doi: 10.7513/j.issn.1004-7638.2025.02.020

Citation:

LIU Lei, HAN Xiuli, ZHANG Di, LIU Ziyao, GUO Jingjing. Effect of borax on microstructure and viscosity of fluorine-free mold fluxes containing titanium-bearing blast furnace slag[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(2): 142-150, 117. doi: 10.7513/j.issn.1004-7638.2025.02.020

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Effect of borax on microstructure and viscosity of fluorine-free mold fluxes containing titanium-bearing blast furnace slag

doi: 10.7513/j.issn.1004-7638.2025.02.020

LIU Lei^{1, 2
,},
HAN Xiuli^{1, 2
,
,},
ZHANG Di^{1, 2},
LIU Ziyao³,
GUO Jingjing³

1.
College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China
2.
Hebei Collaborative Innovation Center for Green Development and Ecological Restoration of Mineral Resources, Tangshan 063210, Hebei, China
3.
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China

More Information

Received Date: 2024-12-26
Available Online: 2025-04-30
Publish Date: 2025-04-30

Abstract

Abstract

To clarify the role of borax as a fluoride substitute in fluoride-free and titanium-bearing mold fluxes, the test samples were prepared using industrial raw materials such as titanium-bearing blast furnace slag, limestone, quartz, soda ash, witherite, and borax. Molecular dynamics simulation and Raman spectroscopy were used to study structural characteristics of the samples, including radial distribution function, average coordination number, bond angle distribution, and structural unit Qⁿdistribution. The intrinsic factors of the viscosity changing with borax content were analyzed from the perspective of slag structure. The results show that with the increase of borax content (from 4% to 12%), the stability of the Ca-O structure deteriorates, a large amount of low polymerization degree B-O structure forms, the order degree of Si-O-Si bond angle decreases, and the structural units Q⁰ gradually depolymerize into Q¹ and Q², making the slag structure more complex and the overall polymerization degree smaller. That is, the viscosity performance decreases macroscopically. Moreover, when the borax content increases to more than 8%, the fluoride-free and titanium-bearing mold fluxes reaches a low and steady viscosity level.
- fluoride-free and titanium-bearing mold fluxes,
- slag structure,
- viscosity,
- borax,
- molecular dynamics simulation

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References(25)

References

[1]	WANG W L, XU H, ZHAI B Y, et al. A review of the melt structure and crystallization behavior of non-reactive mold flux for the casting of advanced high-strength steels[J]. Steel Research International, 2022, 93(3): 2100073. doi: 10.1002/srin.202100073
[2]	MILLS K C, FOX A B. The role of mould fluxes in continuous casting-so simple yet so complex[J]. ISIJ International, 2003, 43(10): 1479-1486. doi: 10.2355/isijinternational.43.1479
[3]	HE Y M, HE S P. Analysis of the lubrication and heat transfer control function of mold powder[J]. Continuous Casting, 2021(2): 2-6. (何宇明, 何生平. 结晶器保护渣的润滑与传热控制功能剖析[J]. 连铸, 2021(2): 2-6. HE Y M, HE S P. Analysis of the lubrication and heat transfer control function of mold powder[J]. Continuous Casting, 2021（2）: 2-6.
[4]	ZHAO J X, ZHAO Z Y, SHANG N, et al. Effect and influence analysis of fluoride in mold powder for continuous casting[J]. Iron and Steel, 2018, 53(10): 8-15. (赵俊学, 赵忠宇, 尚南, 等. 连铸保护渣中氟化物作用及影响分析[J]. 钢铁, 2018, 53(10): 8-15. ZHAO J X, ZHAO Z Y, SHANG N, et al. Effect and influence analysis of fluoride in mold powder for continuous casting[J]. Iron and Steel, 2018, 53（10）: 8-15.
[5]	HAN X L, ZHAO K, LIU L, et al. Research progress of metallurgical properties of fluorine-free continuous casting mold fluxes[J]. Materials Reports, 2022, 36(11): 187-193. (韩秀丽, 赵凯, 刘磊, 等. 无氟连铸保护渣冶金性能的研究进展[J]. 材料导报, 2022, 36(11): 187-193. doi: 10.11896/cldb.20100199 HAN X L, ZHAO K, LIU L, et al. Research progress of metallurgical properties of fluorine-free continuous casting mold fluxes[J]. Materials Reports, 2022, 36（11）: 187-193. doi: 10.11896/cldb.20100199
[6]	WANG X J, WU B B, ZHU L G, et al. Research status and prospect of fluoride-free mold fluxes[J]. Foundry Technology, 2016, 37(9): 1914-1918. (王杏娟, 武宾宾, 朱立光, 等. 无氟连铸保护渣的研究现状及展望[J]. 铸造技术, 2016, 37(9): 1914-1918. WANG X J, WU B B, ZHU L G, et al. Research status and prospect of fluoride-free mold fluxes[J]. Foundry Technology, 2016, 37（9）: 1914-1918.
[7]	WANG X J, QU S, LIU R, et al. Research status and prospect of continuous casting mold flux for high titanium steel[J]. Materials Review, 2021, 35(S1): 467-472. (王杏娟, 曲硕, 刘然, 等. 高钛钢专用连铸保护渣研究现状及展望[J]. 材料导报, 2021, 35(S1): 467-472. WANG X J, QU S, LIU R, et al. Research status and prospect of continuous casting mold flux for high titanium steel[J]. Materials Review, 2021, 35（S1）: 467-472.
[8]	LIU G P. Research status and application of titanium-containing fluorine-free mold flux for continuous casting[J]. World Nonferrous Metals, 2022(11): 163-165. (刘国鹏. 含钛无氟连铸用保护渣研究现状及应用[J]. 世界有色金属, 2022(11): 163-165. doi: 10.3969/j.issn.1002-5065.2022.11.055 LIU G P. Research status and application of titanium-containing fluorine-free mold flux for continuous casting[J]. World Nonferrous Metals, 2022（11）: 163-165. doi: 10.3969/j.issn.1002-5065.2022.11.055
[9]	HAN X L, LIU Y Y, LIU L, et al. Review on research progress of properties and application of titanium-containing continuous casting[J]. Iron and Steel, 2022, 57(10): 10-18. (韩秀丽, 刘盈盈, 刘磊, 等. 含钛型连铸保护渣性能及应用研究进展[J]. 钢铁, 2022, 57(10): 10-18. HAN X L, LIU Y Y, LIU L, et al. Review on research progress of properties and application of titanium-containing continuous casting[J]. Iron and Steel, 2022, 57（10）: 10-18.
[10]	SUN L F, LIU C J, JIANG M F. Viscosity characteristics of continuous casting mold flux containing titanium dioxide[J]. Journal of the Chinese Ceramic Society, 2008(3): 395-399. (孙丽枫, 刘承军, 姜茂发. 含二氧化钛连铸保护渣的黏性特征[J]. 硅酸盐学报, 2008(3): 395-399. doi: 10.3321/j.issn:0454-5648.2008.03.026 SUN L F, LIU C J, JIANG M F. Viscosity characteristics of continuous casting mold flux containing titanium dioxide[J]. Journal of the Chinese Ceramic Society, 2008（3）: 395-399. doi: 10.3321/j.issn:0454-5648.2008.03.026
[11]	WANG W L, CAI D, ZHANG L, et al. Effect of TiO₂ and TiN on the viscosity, fluidity, and crystallization of fluorine-free mold fluxes for casting Ti-bearing steels[J]. Steel Research International, 2021, 92(2): 2000314. doi: 10.1002/srin.202000314
[12]	WANG Z, SHU Q, CHOU K. Viscosity of fluoride-free mold fluxes containing B₂O₃ and TiO₂[J]. Steel Research International, 2013, 84(8): 766-776. doi: 10.1002/srin.201200256
[13]	XIN Q, WEN G, PING T. Viscosity and viscosity estimate model of fluoride-free and titanium-bearing mold fluxes[J]. Journal of Iron and Steel Research International, 2010, 17(6): 6-10. doi: 10.1016/S1006-706X(10)60105-7
[14]	SHU Q, WANG Z, KLUG J L, et al. Effects of B₂O₃ and TiO₂ on crystallization behavior of slags in Al₂O_3-CaO-MgO-Na₂O-SiO₂ system[J]. Steel Research International, 2013, 84(11): 1138-1145. doi: 10.1002/srin.201200341
[15]	WANG Z, SHU Q, CHOU K. Study on structure characteristics of B₂O₃ and TiO₂-bearing F-free mold flux by Roman spectroscopy[J]. High Temperature Materials and Processes, 2013, 32(3): 265-273. doi: 10.1515/htmp-2012-0137
[16]	WANG X J, TIAN K, FAN Y P, et al. Effect of TiO₂ on the properties of continuous casting ternary fluorine-free CaO-SiO₂-TiO₂ slag system[J]. Materials Review, 2018, 32(12): 2100-2104. (王杏娟, 田阔, 樊亚鹏, 等. TiO₂对连铸三元无氟CaO-SiO₂-TiO₂渣系特性的影响[J]. 材料导报, 2018, 32(12): 2100-2104. doi: 10.11896/j.issn.1005-023X.2018.12.030 WANG X J, TIAN K, FAN Y P, et al. Effect of TiO₂ on the properties of continuous casting ternary fluorine-free CaO-SiO₂-TiO₂ slag system[J]. Materials Review, 2018, 32（12）: 2100-2104. doi: 10.11896/j.issn.1005-023X.2018.12.030
[17]	BOTHMA J A, PISTORIUS P C. Heat transfer through mould flux with titanium oxide additions[J]. Ironmaking and Steelmaking, 2007, 34(6): 513-520. doi: 10.1179/174328107X203912
[18]	WEN G H, TANG P, LI S C, et al. Study of fluoride-free mold powder for slab continuous casting[J]. Iron and Steel, 2005, 40(7): 29-32. (文光华, 唐萍, 李书成, 等. 无氟板坯连铸结晶器保护渣的研究[J]. 钢铁, 2005, 40(7): 29-32. doi: 10.3321/j.issn:0449-749X.2005.07.007 WEN G H, TANG P, LI S C, et al. Study of fluoride-free mold powder for slab continuous casting[J]. Iron and Steel, 2005, 40（7）: 29-32. doi: 10.3321/j.issn:0449-749X.2005.07.007
[19]	MIAO S T, WEN G H, TANG P, et al. Study on crystallographic ore phase of mold slag for fluorine-free continuous casting[J]. Journal of Iron and Steel Research, 2006, 18(10): 20-22. (苗胜田, 文光华, 唐萍, 等. 无氟连铸结晶器保护渣的结晶性能[J]. 钢铁研究学报, 2006, 18(10): 20-22. doi: 10.3321/j.issn:1001-0963.2006.10.005 MIAO S T, WEN G H, TANG P, et al. Study on crystallographic ore phase of mold slag for fluorine-free continuous casting[J]. Journal of Iron and Steel Research, 2006, 18（10）: 20-22. doi: 10.3321/j.issn:1001-0963.2006.10.005
[20]	ZHANG Z T, WEN G H, ZHANG Y Y. Crystallization behavior of F-free mold fluxes[J]. International Journal of Minerals, Metallurgy, and Materials, 2011, 18(2): 150-158. doi: 10.1007/s12613-011-0415-z
[21]	HAN W D, QIU S T, ZHANG X Z, et al. Heat transfer and mineral structure of fluorine-free mold slag film on molds[J]. Journal of Iron and Steel Research, 2007(3): 14-16. (韩文殿, 仇圣桃, 张兴中, 等. 结晶器无氟保护渣渣膜的传热性和矿物结构[J]. 钢铁研究学报, 2007(3): 14-16. doi: 10.3321/j.issn:1001-0963.2007.03.004 HAN W D, QIU S T, ZHANG X Z, et al. Heat transfer and mineral structure of fluorine-free mold slag film on molds[J]. Journal of Iron and Steel Research, 2007（3）: 14-16. doi: 10.3321/j.issn:1001-0963.2007.03.004
[22]	HAN W D, QIU S T, GAN Y, et al. Heat transfer research and production practice of TiO₂-containing fluorine-free mold powder[J]. Journal of Iron and Steel Research, 2006(1): 9-10. (韩文殿, 仇圣桃, 干勇, 等. 含TiO₂无氟保护渣的传热研究及生产实践[J]. 钢铁研究学报, 2006(1): 9-10. doi: 10.3321/j.issn:1001-0963.2006.01.003 HAN W D, QIU S T, GAN Y, et al. Heat transfer research and production practice of TiO₂-containing fluorine-free mold powder[J]. Journal of Iron and Steel Research, 2006（1）: 9-10. doi: 10.3321/j.issn:1001-0963.2006.01.003
[23]	FAN X Y, ZHANG J L, JIAO K X, et al. Influence of B₂O₃ on viscosity and structure of low MgO slag containing titanium[J]. Metallurgical Research & Technology, 2018, 115(3): 313-319.
[24]	ZHOU H M, CHENG M H, LI J. Effect of Na₂O on the glass-ceramics structure and properties of MgO-Al₂O₃-B₂O₃-SiO₂ system[J]. China Ceramics, 2019, 55(2): 44-49. (周宏明, 程名辉, 李荐. Na₂O对MgO-Al₂O₃-B₂O₃-SiO₂体系微晶玻璃结构和性能的影响[J]. 中国陶瓷, 2019, 55(2): 44-49. ZHOU H M, CHENG M H, LI J. Effect of Na₂O on the glass-ceramics structure and properties of MgO-Al₂O₃-B₂O₃-SiO₂ system[J]. China Ceramics, 2019, 55（2）: 44-49.
[25]	SU D Y, YOU J L, WANG J, et al. Raman spectra of B₂O₃-Na₂O-CaO-SiO₂ glasses structure[J]. Spectroscopy and Spectral Analysis, 2023, 43(S1): 249-250. (苏东艳, 尤静林, 王建, 等. B₂O₃-Na₂O-CaO-SiO₂玻璃结构的拉曼光谱研究[J]. 光谱学与光谱分析, 2023, 43(S1): 249-250. SU D Y, YOU J L, WANG J, et al. Raman spectra of B₂O₃-Na₂O-CaO-SiO₂ glasses structure[J]. Spectroscopy and Spectral Analysis, 2023, 43（S1）: 249-250.