is a neutral refractory material with **Al₂O₃ content ≥48%**, sintered from bauxite at ≥1500°C, outperforming fireclay bricks in key metrics.  

Key Properties

| Parameter         | Range                    | vs. Clay Brick         

| Al₂O₃ Content | 48%–85% (graded)         | ↑ +30%–100%            

| Refractoriness| 1750°C–1900°C            | ↑ +200°C+              

| Load Softening| 1420°C–1550°C       | ↑ +100°C–150°C         

| Comp. Strength| 50–120 MPa        | ↑ +40%+                

| Slag Resistance| Strong (acidic slag)     | ↑ Significantly better |  

Grade Classification (GB/T 2988-2012)  

| Grade    | Al₂O₃ Content | Service Temp. | Typical Applications          

| LZ-65    | 65%–70%     | 1450°C        | Cement preheaters, lime kilns |  

| LZ-75    | 75%–80%  | 1550°C    | EAF roofs, glass regenerators

| LZ-80    | ≥80%          | 1600°C        | Ladle linings, induction furnaces

Primary Applications

High-temperature furnaces: Blast furnace throats (steel), cement rotary kilns (transition zones), glass tanks  

Specialized fields: Vacuum furnace linings, FCC units (petrochemical)  

Resource Note: China restricts bauxite mining (3% global reserves), promoting recycled high-alumina bricks.