Description
High-alumina bricks are generally classified into high-alumina bricks and low-creep high-alumina bricks.
High-alumina brick is a kind of neutral refractory materials made from bauxite or other raw materials with a high alumina (Al2O3) content, which contain more than 48% alumina and is formed and calcined at high temperatures. They offer excellent high-temperature resistance, corrosion resistance, thermal stability, and slag resistance, making them particularly suitable for equipment and processes running at high temperatures for a long time.
Low-creep high-alumina brick is a kind of high-grade refractory materials made primarily from superior-grade bauxite, fused corundum, and fused mullite. These bricks feature low creep at high temperatures, strong corrosion resistance, and excellent thermal shock stability, making them ideal for demanding high-temperature applications.
Specifications
| Item | Grade | ||||||
| LZ-80 | LZ-75 | LZ-70 | LZ-65 | LZ-55 | LZ-48 | LZ-65G | |
| ω(Al2O3) / % | ≥80 | ≥75 | ≥70 | ≥65 | ≥55 | ≥48 | ≥65 |
| Open Porosity / % | ≤21(23) | ≤24(26) | ≤24(26) | ≤24(26) | ≤22(24) | ≤22(24) | ≤19 |
| CCS / MPa | ≥70(60) | ≥60(50) | ≥55(45) | ≥50(40) | ≥45(40) | ≥40(35) | ≥60 |
| ≥60(50) | ≥50(40) | ≥45(35) | ≥40(30) | ≥35(30) | ≥30(35) | ≥50 | |
| R.U.L.(0.2 MPa T0.6) / ℃ | ≥1530 | ≥1520 | ≥1510 | ≥1500 | ≥1450 | ≥1420 | ≥1500 |
| HPLC / % | 1500℃×2 h 0.4～0.2 | 1450℃×2 h 0.4～0.1 | 1450℃×2 h 0.2～0 | ||||
| Remarks: The data in parentheses are for the lattice bricks and shaped bricks. | |||||||
Specifications of Low-Creep Type
| Item | Grade | |||||||
| DRL-155 | DRL-150 | DRL-145 K | DRL-145 | DRL-140 | DRL-135 | DRL-130 | DRL-127 | |
| ω(Al2O3) /% | ≥75 | ≥75 | ≥65 | ≥65 | ≥65 | ≥60 | ≥50 | |
| ω(Fe2O3) /% | ≤0.8 | ≤1.0 | ≤1.2 | ≤1.5 | ≤1.8 | ≤2.0 | ≤2.0 | |
| ω(TiO2)/% | ≤0.5 | ≤0.8 | ≤1.0 | — | — | — | — | |
| Open Porosity/% | ≤18 | ≤19 | ≤20 | ≤20(22) | ≤20(22) | ≤20(22) | ≤20(22) | ≤21(23) |
| Bulk density/(g/cm³) | ≥2.65 | ≥2.60 | ≥2.50 | ≥2.50 (2.45) | ≥2.45 (2.40) | ≥2.40 (2.35) | ≥2.35 (2.30) | ≥2.30 (2.25) |
| CCS / MPa | ≥70 | ≥70 | ≥60 | ≥65(55) | ≥65(55) | ≥60(50) | ≥60(50) | ≥55(45) |
| 60 | 60 | 50 | 55(45) | 55(45) | 50(40) | 50(40) | 45(35) | |
| 0.2 MPa creep rate (50 h)/% | ≤1550℃ 0.8 | ≤1500℃ 0.8 | ≤1450℃ 0.8 | ≤1400℃ 0.8 | ≤1350℃ 0.8 | ≤1300℃ 0.8 | 1270℃ 0.8 | |
| HPLC / % | 1500℃ ×2 h 0～0.2 | 1500℃×2 h —0.2～0.2 | 1450℃ ×2h —0.2～0.2 | 1450℃×2 h —0.3～0.2 | ||||
| TSR(1100℃, cold water) / Times | ≥15 | ≥15 | ≥30 | ≥15 | — | |||
| Remarks: The data in parentheses are for the lattice bricks. | ||||||||
Applications
High-alumina bricks can be used as linings for electric arc furnaces, glass melting furnaces, cement rotary kilns, and other similar applications. Low-creep high-alumina bricks are suitable for medium and large hot blast stoves, among others.
