Description
High alumina insulating brick is a kind of heat-insulating refractory product made primarily from bauxite, with an Al2O3 content of no less than 48%. They are mainly produced using bauxite clinker, combined with clay as raw materials, and mixed with binders and sawdust. To enhance the product’s performance, industrial alumina, corundum, sillimanite, kyanite and silica are added in fine powder form to produce products with a bulk density of over 0.4 g/cm³. The characteristics of these products include light weight, excellent thermal insulation properties (low thermal conductivity), high refractoriness, excellent thermal stability and mechanical strength.
Specification
| Item | Grade | |||||
| LG140-1.2 | LG140-1.0 | LG140-0.8L | LG135-0.7L | LG135-0.6L | LG125-0.5L | |
| ω(Al₂O₃)/%≥ | 48 | |||||
| ω(Fe₂O₃)/%≤ | 2.0 | |||||
| Bulk Density(g/cm³)≤ | 1.2 | 1.0 | 0.8 | 0.7 | 0.6 | 0.5 |
| CCS / MPa ≥ | 4.5 | 3.5 | 2.5 | 2.2 | 1.6 | 1.2 |
| min4.0 | min3.0 | min2.2 | min2.0 | min1.5 | min1.0 | |
| HPLC / % | 1400℃×12 h —2～1.0 | 1350℃×12 h —2～1.0 | 1250℃×12 h —2～1.0 | |||
| λ [W/m·k] (350±25℃) ≤ | 0.55 | 0.50 | 0.35 | 0.30 | 0.25 | 0.20 |
Applications
Widely used as an insulation layer in reheating furnaces and soaking pits in the steel industry, shuttle kilns and roller kilns in the ceramics industry, and glass melting furnaces in the glass industry. It can also be used as an insulation layer in high-temperature equipment such as cracking furnaces and reforming furnaces in the petrochemical industry.
