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Rebonded fused cast AZS block is made of AZS frit or waste fused cast AZS block by adding a small amount of kaolin or alumina as binder. Rebonded fused cast AZS block is composed of A12O3 (50-60%), ZrO2 (20-30%) and SiO2 (14-20%).

When heated to a certain temperature, glass phase exuded by fused cast AZS forms mullite with binding agents. Bricks should be fired at 1600-1700℃. The frits should have homogeneous chemical composition and a low content of glass phase. Waste bricks have non-homogeneous composition and a high content of glass phase (15%-25%).