High-alumina refractory bricks and special shapes designed for direct-reduction iron shaft iron kilns, rotary pelletizing kilns and pelletizing-furnace burner zones exposed to reducing gases, abrasion, heat and chemical wear.
Refractory Requirements in Reducing Atmospheres
In the upper section of a direct-reduction iron shaft kiln, pellets and reducing gas move through the furnace. The lining must therefore resist pellet abrasion, gas erosion and the chemical effects of carbon monoxide.
The reducing-gas inlet and bustle region is one of the most demanding zones. Refractory selection in this area must balance thermal stability, abrasion resistance and compatibility with the reducing atmosphere.
Three Main Refractory Solutions
The following products cover the principal applications identified for direct-reduction iron shaft kilns, rotary pelletizing kilns and pelletizing-furnace burner ports.
High Alumina (Andalusite) Brick
An andalusite-based high-alumina refractory for zones requiring stable service in a reducing atmosphere and resistance to pellet-related mechanical wear.
Fired Phosphate-Bonded High Alumina (Andalusite) Brick
A fired andalusite high-alumina refractory using a phosphate-bonded system for demanding rotary-kiln lining service.
High Alumina (Alumina-Mullite) Brick
A high-alumina alumina-mullite refractory for special-shaped lining in burner ports and other zones exposed to concentrated thermal loading.
Recommended Refractory Qualities
This table summarizes the three refractory qualities and their principal application areas.
| Refractory Quality | Material Classification | Recommended Application |
|---|---|---|
| High Alumina (Andalusite) Brick | Andalusite-based high-alumina refractory | Bustle, bustle inlet and upper sidewall areas of direct-reduction iron shaft kilns. |
| Fired Phosphate-Bonded High Alumina (Andalusite) Brick | Fired andalusite-based refractory with a phosphate-bonded system | Refractory lining in the rotary kiln of an iron-ore pelletizing system. |
| High Alumina (Alumina-Mullite) Brick | Alumina-mullite high-alumina refractory | Refractory lining in the burner port of a pelletizing furnace. |
Typical Areas of Use
Direct-Reduction Iron Shaft Kiln
High-alumina andalusite bricks for bustle, gas-inlet and upper-sidewall zones exposed to reducing gas, abrasion and erosion.
Rotary Pelletizing Kiln
Fired phosphate-bonded high-alumina andalusite bricks for rotary-kiln lining subjected to mechanical and thermal cycling.
Pelletizing-Furnace Burner Port
Alumina-mullite special-shaped bricks for concentrated heat, thermal shock and burner-side lining service.
Information Required for Product Selection
Final refractory quality and shape should be selected according to the equipment design and actual operating conditions.
Request a Direct Reduction or Pelletizing Refractory Quotation
Send us the equipment type, operating conditions, lining-zone drawings, brick dimensions, required quantity and destination country for technical review.