Development of activity calculation model for the CaO-Al2O3-MgO-SiO2-Ce2O3 slag system

Yu Cheng; Qiu Jiyu; Liu Chengjun

doi:10.7513/j.issn.1004-7638.2022.04.019

Volume 43 Issue 4

Sep. 2022

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Yu Cheng, Qiu Jiyu, Liu Chengjun. Development of activity calculation model for the CaO-Al2O3-MgO-SiO2-Ce2O3 slag system[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 121-126. doi: 10.7513/j.issn.1004-7638.2022.04.019

Citation:

Yu Cheng, Qiu Jiyu, Liu Chengjun. Development of activity calculation model for the CaO-Al₂O₃-MgO-SiO₂-Ce₂O₃ slag system[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(4): 121-126. doi: 10.7513/j.issn.1004-7638.2022.04.019

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Development of activity calculation model for the CaO-Al₂O₃-MgO-SiO₂-Ce₂O₃ slag system

doi: 10.7513/j.issn.1004-7638.2022.04.019

Yu Cheng^{1, 2
,},
Qiu Jiyu^{1, 2
,
,},
Liu Chengjun^{1, 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

Received Date: 2022-01-27
Publish Date: 2022-09-14

Abstract

Abstract

During smelting steel containing rare earth elements, there exists strong reaction between the molten steel and the slag, which may result in significant content fluctuation of dissolved rare earth and then reduce its effect in steel. However, the lack of thermodynamic data of rare earth-containing slag system limits the development of related research work. In this paper, based on the ion and molecule coexistence theory, an activity calculation model of the CaO-Al₂O₃-MgO-SiO₂-Ce₂O₃ slag system has been established, which can be used to construct the iso-activity diagram and investigate w(CaO)/w(Al₂O₃), w(Ce₂O₃) and other composition changes on the activity of each component of the slag system. The results show that the SiO₂ activity range (4×10⁻¹⁹~7×10⁻¹⁸) of CaO-Al₂O₃-based refining slag is much smaller than that of CaO-SiO₂-based refining slag (0.003~0.4), that is, CaO-Al₂O₃-based slag is more suitable for rare earth steel. For CaO-Al₂O₃-based refining slag, increasing the w(CaO)/w(Al₂O₃) and w(Ce₂O₃) of the slag can increase the activity of Ce₂O₃ and decrease the activity of Al₂O₃ , which may restrain the reaction between the rare earth-containing molten steel and Al₂O₃ in the slag.
- rare earth steel,
- slag system,
- activity,
- ion and molecule coexistence theory

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References(19)

References

[1]	Yue L, Wang L, Han J. Effects of rare earth on inclusions and corrosion resistance of 10 PCuRE weathering steel[J]. Journal of Rare Earths, 2010,(6):5.
[2]	Xu Y W, Song S H, Wang J W. Effect of rare earth cerium on the creep properties of modified 9Cr–1Mo heat-resistant steel[J]. Materials Letters, 2015,161(15):616−619.
[3]	Hamidzadeh M A, Meratian M, Saatchi A. Effect of cerium and lanthanum on the microstructure and mechanical properties of AISI D2 tool steel[J]. Materials Science and Engineering:A, 2013,571(1):193−198.
[4]	Qi J, Liu C J, Jiang M F. Viscosity-structure-crystallization of the Ce₂O₃-bearing calcium-aluminate-based melts with different contents of B₂O₃[J]. ISIJ International, 2018,58(1):186−193. doi: 10.2355/isijinternational.ISIJINT-2017-252
[5]	Mitsutaka H, Kimihisa I. Thermodynamic data for steelmaking[M]. Japan: Tohoku University Press, 2010.
[6]	Kitano R, Ishii M, Motohiro U O, et al. Thermodynamic properties of the CaO-AlO_1.5-CeO_1.5 system[J]. ISIJ International, 2016,56(11):1893−1901. doi: 10.2355/isijinternational.ISIJINT-2016-201
[7]	田彦文, 翟秀静, 刘奎仁. 冶金物理化学 [M]. 北京: 化学工业出版社, 2007. Tian Yanwen, Zhai Xiujing, Liu Kuiren. Physical chemistry of metallurgy[M]. Beijing: Metallurgical Industry Press, 2007.
[8]	魏庆成. 冶金热力学[M]. 重庆: 重庆大学出版社, 1996. Wei Qingcheng. Metallurgical thermodynamics [M]. Chongqing: Chongqing University Press, 1996.
[9]	张鉴, 成国光, 王力军, 等. 冶金熔体的计算热力学 [M]. 北京: 冶金工业出版社, 1998. Zhang Jian, Cheng Guoguang, Wang Lijun, et al. Computational thermodynamics of metallurgical melts[M]. Beijing: Metallurgical Industry Press, 1998.
[10]	Yang X M, Duan J P, Shi C B, et al. A Thermodynamic model of phosphorus distribution ratio between CaO-SiO₂-MgO-FeO-Fe₂O₃-MnO-Al₂O₃-P₂O₅ slags and molten steel during a top–bottom combined blown converter steelmaking process based on the ion and molecule coexistence theory[J]. Metallurgical & Materials Transactions B, 2011,42(4):738−770.
[11]	Ma Deng, Wu Wei, Dai Shifan, et al. Activity-calculating model of vanadium slag system and its application[J]. Journal of Materials and Metallurgy, 2017,16(4):7. (马登, 吴巍, 戴诗凡, 等. 含钒渣系活度计算模型及应用[J]. 材料与冶金学报, 2017,16(4):7. doi: 10.14186/j.cnki.1671-6620.2017.04.001 Ma Deng, Wu Wei, Dai Shifan, et al. Activity-calculating model of vanadium slag system and its application[J]. Journal of Materials and Metallurgy, 2017, 16(4): 7. doi: 10.14186/j.cnki.1671-6620.2017.04.001
[12]	M Susa. Slag Atlas 2nd ed[M]. German: Verlag Stahleisen GmbH, 1995.
[13]	Lan X, Gao J, Du Y, et al. Thermodynamics and crystallization kinetics of REEs in CaO–SiO₂–Ce₂O₃ system[J]. Journal of the American Ceramic Society, 2020,4:103.
[14]	Bale C W, Bélisle E, Chartrand P, et al. Reprint of: FactSage thermochemical software and databases, 2010–2016[J]. Calphad, 2016,55:1−19. doi: 10.1016/j.calphad.2016.07.004
[15]	Li X, Yang L, Zhou Q, et al. A split-combination method for estimating the thermodynamic properties (Go and Ho) of multicomponent minerals[J]. Applied Clay Science, 2020,185:105406. doi: 10.1016/j.clay.2019.105406
[16]	Leitner J, Chuchvalec P, Sedmidubsky D, et al. Estimation of heat capacities of solid mixed oxides[J]. Thermochimica Acta, 2002,395(1-2):27−46. doi: 10.1016/S0040-6031(02)00177-6
[17]	Kubaschewski O, Uenal H. An empirical estimation of the heat capacities of inorganic compounds[J]. High Temperatures-High Pressures, 1977,9(3):361−365.
[18]	Zheng X, Liu C J. Thermodynamic properties assessment of CaO-Al₂O₃-Ce₂O₃ system[J]. Metallurgical and Materials Transactions B, 2021,52:3183−3192. doi: 10.1007/s11663-021-02245-z
[19]	Du Yong, Peng Jiaqing, Ji Jianying. Practice on 100 t ladle furnace[J]. China Metallurgy, 2006,(8):17−19. (杜勇, 彭家清, 姬健营. 100 t转炉LF精炼工艺的生产实践[J]. 中国冶金, 2006,(8):17−19. doi: 10.3969/j.issn.1006-9356.2006.08.005 Du Yong, Peng Jiaqing, Ji Jianying. Practice on 100 t ladle furnace[J]. China Metallurgy, 2006(8): 17-19. doi: 10.3969/j.issn.1006-9356.2006.08.005