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Worn Refractory Bricks – Alko: Resource of Corundum and Mullite Clinkers

The spent linings from the pouring ladle for pig iron transport and steel ladle were investigated. The quality and composition of the particle-size classes were evaluated after crushing of the spent linings. The degree of contamination of refractory masses, the redistribution of the fundamental components (Al2O3, MgO, SiO2, C) into grain fractions of (0–1 mm), (1–2,5 mm) and (2,5–5 mm) and magnetic proportion were observed. The iron particles and Fe- and Ca-compounds are mainly concentrated in the magnetic proportion. 70–75 mass-% of refractory material from spent Alko 80 AMC-S bricks could be effectively recycled. It is possible to obtain the size class of 1–5 mm with content up 80–85 % of Al2O3. The redistribution into size classes during the crushing of the spent Alko 60 A bricks did not occur. After removing the magnetic fraction, the residue contains more than 95 % of (Al2O3+SiO2) with the dominant mullite phase.


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