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Influence of MgAl₂O₄ Spinel Addition on Properties of Alumina-Chrome Refractory Prepared with Alumina-Chrome Slag

J. Wu, J. Liu, R. Li, Q. Zhen

Journal of Ceramic Science and Technology, Vol. 7, No. 4 (2016), pp. 447-454

DOI: 10.4416/JCST2016-00076

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Abstract

Alumina-chrome refractory was developed using alumina-chrome slag of different grades (5 ∼ 3 mm, 3 ∼ 1 mm, 0.088 mm and 0.045 mm), with added micron-grade MgAl2O4 spinel powders. Batch materials were milled, pressed and sintered at 1500 °C with 22 h soaking. The refractory with 5 wt% MgAl2O4 exhibited the best properties in terms of bulk density and apparent porosity. In all the refractory samples, new phases were formed as a result of slag-refractory and copper-refractory interaction. With the addition of MgAl2O4 spinel, the corrosion resistance of the alumina-chrome refractory was improved remarkably.

Keywords

Alumina-chrome refractory, alumina-chrome slag, MgAl2O4 spinel, slag corrosion, crude copper corrosion

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