Phase Equilibrium Relationships of CaO-Al2O3-Ce2O3-CaF2 Slag System at 1 400 ℃ in Argon

doi:10.12068/j.issn.1005-3026.2025.20240059

Abstract

Abstract:

In order to fill the gap in thermodynamic research and thermodynamic data of metallurgical slag system of rare earth steel， the phase equilibrium relationships and liquid phase distribution of CaO-Al₂O₃-Ce₂O₃-CaF₂ slag system at 1 400 ℃ in argon were determined by the high-temperature thermodynamic equilibrium experiment and scanning electron microscope-energy dispersive spectrometer （SEM-EDS）， and the isothermal phase diagram was plotted. Eight equilibrium coexistence regions in the CaO-Al₂O₃-Ce₂O₃-CaF₂ slag system were determined at 1 400 ℃ in argon， including a single liquid phase region， four two-phase equilibrium regions （L+C₁₁A₇F， L+C₂A₃Ce， L+C₂ACe， and L+CA₂）， and three three-phase equilibrium regions （L+C+C₂ACe， L+C₂ACe+C₁₁A₇F， L+CA₂+C₂A₃Ce）. The liquid phase region of the CaO-Al₂O₃-Ce₂O₃-CaF₂ slag system at 1 400 ℃ in argon was determined by the liquid phase boundary in the two-phase equilibrium regions.

Key words: CaO-Al₂O₃-Ce₂O₃-CaF₂ slag system, phase equilibrium relationship, liquid phase region, thermodynamic equilibrium, isothermal phase diagram

CLC Number:

TF 14

Jiang-sheng YE, Cheng-jun LIU, Zhi-gang LIANG, Ye-guang WANG. Phase Equilibrium Relationships of CaO-Al₂O₃-Ce₂O₃-CaF₂ Slag System at 1 400 ℃ in Argon[J]. Journal of Northeastern University(Natural Science), 2025, 46(10): 89-95.

Figures/Tables 10

References 20

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编号	CaO	Al₂O₃	CeO₂	CaF₂	w(CaO)/ w(Al₂O₃)
1	34.39	35.42	15.03	15.16	0.97
2	35.18	37.78	12.17	14.88	0.93
3	37.09	37.78	9.68	15.45	0.98
4	31.62	44.13	8.65	15.60	0.72
5	29.24	41.52	13.96	15.27	0.70
6	19.05	60.68	4.32	15.96	0.31
7	14.40	58.40	12.18	15.02	0.25
8	39.32	49.83	2.13	8.72	0.79
9	33.91	45.90	13.00	7.19	0.74
10	24.53	53.01	8.86	13.60	0.46
11	28.33	56.15	4.46	11.05	0.50
12	20.11	61.07	11.44	7.38	0.33
13	32.87	59.19	2.59	5.35	0.56
14	50.28	44.83	2.32	2.57	1.12

编号	CaO	Al₂O₃	CeO₂	CaF₂	w(CaO)/ w(Al₂O₃)
1	34.39	35.42	15.03	15.16	0.97
2	35.18	37.78	12.17	14.88	0.93
3	37.09	37.78	9.68	15.45	0.98
4	31.62	44.13	8.65	15.60	0.72
5	29.24	41.52	13.96	15.27	0.70
6	19.05	60.68	4.32	15.96	0.31
7	14.40	58.40	12.18	15.02	0.25
8	39.32	49.83	2.13	8.72	0.79
9	33.91	45.90	13.00	7.19	0.74
10	24.53	53.01	8.86	13.60	0.46
11	28.33	56.15	4.46	11.05	0.50
12	20.11	61.07	11.44	7.38	0.33
13	32.87	59.19	2.59	5.35	0.56
14	50.28	44.83	2.32	2.57	1.12

Phase Equilibrium Relationships of CaO-Al₂O₃-Ce₂O₃-CaF₂ Slag System at 1 400 ℃ in Argon

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渣样编号	相平衡关系
8	L+C₁₁A₇F
10	L+C₂A₃Ce
11	L+CA₂+C₁₁A₇F
13	L+C₂A₃Ce+C₃A₃F
14	L+C₃A+C₁₁A₇F
1，2，3	L+C+C₂ACe
4，5，9	L+C₂ACe+C₁₁A₇F
6，7，12	L+CA₂+C₂A₃Ce