High-strength 310 lower nozzle brick and preparation method thereof

The invention discloses a high-strength 310 lower nozzle brick. The lower nozzle brick is mainly prepared from the following raw materials in parts by weight: 30-50 parts of homogenized alumina clinker of which Al2O3 is more than or equal to 70% and less than or equal to 90%, 15-25 parts of corundum, 5-15 parts of mullite particles of which Al2O3 is more than or equal to 70% and less than or equalto 90% and Fe2O3 is less than or equal to 2%, 5-10 parts of flint clay of which Al2O3 is more than or equal to 45% and less than or equal to 80% and Fe2O3 is less than or equal to 1%, 1-10 parts of light calcined magnesia powder, and 5-15 parts of white mud of which Al2O3 is more than or equal to 34% and less than or equal to 60% and Fe2O3 is less than or equal to 2%. According to the invention,the heat resistance and the compression resistance of the lower nozzle brick are improved, and the service life is greatly prolonged. The invention further discloses a preparation method of the high-strength 310 lower nozzle b