Abstract:Multi-phase refractory materials were prepared using copper slag tailings and waste high-alumina bricks. Thermodynamic behavior of copper slag tailings during sintering was studied by XRD and TG-MS. Influence of copper slag tailing and waste high-alumina brick content on mechanical properties and high temperature properties of refractory materials were studied. Microstructure and phase transition process of multi-phase refractory materials were studied by SEM-EDS and XRD. Results showed that decomposition product of iron olivine in copper slag tailings reacted in-situ with alumina in waste high-alumina brick, and finally formed a mullite-corundum composite crystal phase combined with Fe-Al intercrystalline phase. When mass fraction of waste high-alumina brick and copper slag tailing was 40% and 10%, respectively, comprehensive performance of refractory material was the best. Compressive strength was 110.4 MPa, refractoriness under load reached 1 399 ℃, and strength retention rate after thermal shock was more than 80%. Research results provided a new prospective for high-value utilization of copper slag tailings and waste high-alumina bricks which are the main solid waste in copper smelting industry.