Magnesium Iron Spinel Brick
1. Excellent adhering coating performance 2. Low thermal conductivity （1000℃，27w/m·k） 3. Small thermal expansion coefficient（1000℃，1..217%） 4. Excellent structural flexibility & strong penetration resistance 5. Anti-erosion to alkali salt content of K2SO4、Na2SO4、NaCl、KCl decomposed by cement material
Brief Introduction
Magnesia iron spinel bricks is a type of new product developed by ourselves independently by the conclusion of years’ working experience and combining the advanced technology of related large scale cement kilns at home and abroad. Which has already obtained the national invention patent. Magnesia Iron Spinel Brick was successfully developed in the year of 2005, which has already been widely used in the firing zone of 5000d/t cement kilns at home and abroad. And we also can customize this brick according to your kiln and your request. 
Technical Datas
| Item | Magnesia-iron spinel brick | High toughness magnesia-iron spinel brick |
| MgO% ≥ | 85 | 88 |
| Fe2O3% | 5-7.5 | 5-6 |
| SiO2% ≤ | 2 | 1.5 |
| Al2O3% ≤ | 3.0-5.0 | 4.0-7.0 |
| apparent porosity% ≥ | 17 | 16 |
| volume density g/cm3 ≥ | 3 | 2.9 |
| cold compressive strength Mpa ≥ | 45 | 55 |
| 0.2MPa refractoriness under load, ℃ ≥ | 1600 | 1650 |
| Thermal shock stability(1100℃~water cooling), times ≥ | 6 | 8 |
| Thermal conductivity W/MK ≤ | 2.6 | 2.6 |
| Thermal expansion % （1400℃） ≤ | 1.6 | 1.7 |
Application
Magnesia-iron spinel brick is mainly used in the firing zone of cement rotary kiln.
