Erosion Behavior of Refining Slag with Different Basicities on Magnesia-Carbon Refractories

doi:10.16552/j.cnki.issn1001-1625.2025.0832

Abstract

Abstract:

Three types refining slag with different basicities （R = 0.8， 1.0， and 1.2） were prepared. The influence of basicity on resistance to slag erosion of MgO-C bricks was systematically investigated using thermodynamic calculations， surface tension measurements and dynamic anti-slag test. The results show that with the increase of basicity， the viscosity of slag decreases and the surface tension increases significantly. In refining slag S1 （R=0.8）， higher solubility of MgO results in more severe erosion of MgO-C refractories. For refining slag S3 （R=1.2）， increased CaO content causes reduced viscosity and elevated surface tension， which enhances slag penetration by 69.14% compared to refining slag S1 （R=0.8）. However， the structural integrity of refractory is relatively well-preserved. This study demonstrates that moderately increasing refining slag basicity can extend the service life of MgO-C refractories. However， in practical application， it is necessary to comprehensively consider its influence on inclusions in steel.

Key words: cord steel, refining slag, magnesia-carbon refractory, resistance to slag erosion, viscosity, surface tension

CLC Number:

TQ175.1

YE Yukui, LEI Changkun, LIAO Jiaming, ZHANG Xin, HU Tianzeng, REN Bo, WANG Enhui, HOU Xinmei. Erosion Behavior of Refining Slag with Different Basicities on Magnesia-Carbon Refractories[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(2): 655-662.

Figures/Tables 14

Table 1 Main chemical composition of cord steel refining slag

Composition	CaO	SiO₂	MgO	Al₂O₃	Fe₂O₃	MnO	TiO₂	K₂O
Mass fraction/%	38.43	37.99	17.00	2.85	2.00	1.34	0.28	0.10

Table 2 Chemical composition of refining slag with different basicities

Sample	Mass fraction/%								Basicity
Sample	CaO	SiO₂	MgO	Al₂O₃	Fe₂O₃	MnO	TiO₂	K₂O	Basicity
S1	33.97	42.46	17.00	2.85	2.00	1.34	0.28	0.10	0.8
S2	38.21	38.21	17.00	2.85	2.00	1.34	0.28	0.10	1.0
S3	41.69	34.74	17.00	2.85	2.00	1.34	0.28	0.10	1.2

Fig.1 Schematic diagram of dynamic anti-slag device

Fig.2 Thermodynamic calculation of viscosity of refining slag with different basicities

Fig.3 Surface tension of refining slag with different basicities

Table 3 XRF results of commercial MgO-C bricks

Composition	MgO	Al₂O₃	SiO₂	C	SO₃	CaO	MnO	Fe₂O₃
Mass fraction/%	75.10	2.01	4.78	14.90	0.22	2.91	0.11	1.47

Fig.4 Macroscopic images of MgO-C bricks after refining slag erosion at 1 550 ℃

Fig.5 Erosion depth of refractory materials by refining slag with different basicities

Fig.6 Calculation model used to simulate erosion

Fig.7 Interface reaction diagrams of refractories and refining slag with different basicities

Fig.8 Penetration depth and surface scanning of MgO-C bricks eroded by refining slag with different basicities

Fig.9 SEM images of erosion cross-section of MgO-C bricks after refining slag erosion

Table 4 EDS analysis of erosion specimens in Fig.9

Point	Atomic fraction/%
Point	C	N	O	Mg	Al	Si	Pt	Ca
1	—	—	46.17	53.45	—	—	0.38	—
2	4.53	3.30	53.80	14.95	—	12.23	0.33	10.87
3	4.88	4.10	54.76	6.52	2.75	13.16	0.32	13.51
4	1.16	—	49.85	16.50	—	15.24	0.38	16.88
5	—	41.47	—	58.06	—	—	0.47	—

Fig.10 Maximum solubility of MgO in refining slag with different basicities

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