Designing low-carbon MgO–Al2O3–La2O3–C refractories with balanced performance for ladle furnaces. Issue 9 (August 2022)

• Record Type: Journal Article
• Authors: Ren, Xinming; Ma, Beiyue; Liu, Hao; Wang, Zhoufu; Deng, Chengji; Liu, Guoqi; Yu, Jingkun
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 9(2022)
• Page Start: 3986
• Page End: 3995
• Publication Date: 2022-08
• Subjects: MgO-C refractory -- La2O3 -- Slag resistance -- MgAl2O4 -- Thermal shock resistance; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.03.051
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In order to achieve high-quality and stable production of special steel, the performance of low-carbon MgO-C refractories needs to be further optimized. For this purpose, low-carbon MgO–Al2 O3 –La2 O3 –C refractories with enhanced thermal shock resistance and slag resistance were designed and successfully prepared by introducing Al2 O3 as a reinforcer and La2 O3 as a modifier. The results showed that the refractory samples with additives show better overall performance than those without additives. When 10 wt% of Al2 O3 and La2 O3 were added, the oxidation resistance, thermal shock resistance and slag resistance of the refractory samples coked at 1400 °C are increased by 13.57%, 17.75% and 43.09%, respectively. The analysis found that this can be mainly attributed to the formation of MgAl2 O4, Mg2 SiO4, and 2CaO·4La2 O3 ·6SiO2 and the consequent volume expansion effect and intergranular phase enhancement effect. Therefore, a low-cost and enforceable reinforcement strategy for low-carbon MgO-C refractories is proposed, which is expected to be applied in steelmaking.