Description of magnesia alumina spinel bricks
Magnesia-alumina spinel bricks are made of alkaline material, the minerals are magnesite and spinel, which are formed by high pressure moulding and high temperature sintering, and excellent mineralising agent is added so that the product is directly bonded between the particles of the crystalline phase. Spinel is characterised by high strength, good resistance to thermal shock and strong resistance to chemical attack. The unique structure of spinel can still maintain stable physical and chemical properties at high temperatures, and the refractory temperature can reach more than 1800°C. At the same time, it has good mechanical strength and thermal shock resistance, and can withstand frequent temperature changes without cracking.
Characteristics of magnesia-alumina-spinel bricks
| Name of indicator | KRSH-1 | KRSH-2 | KRSH-3 | KRSH-4 |
|---|---|---|---|---|
| MgO, %, no less | 88 | 86 | 84 | 82 |
| Al2O3, %, ≥ | 6 | 9 | 9 | 8 |
| SiO2, %, no more | 0,5 | 0,5 | 0,8 | 1,0 |
| Apparent density, g/cm3, no more than | 2.9 | 2.9 | 2.85 | 2.8 |
| Open porosity %, not more than | 18 | 18 | 19 | 20 |
| Compressive strength, N/mm², not less than | 60 | 60 | 50 | 45 |
| Refractorines under load,, 0,2 ,°С, not lower | 1700 | 1700 | 1680 | 1650 |
| Теплостойкость, 1100 ℃ ≥ (раз) | 10 | 10 | 10 | 10 |
| Теплопроводность TC W / m.k | 2.9 | 2.9 | 2.8 | 2.7 |
Application of magnesium-aluminia spinel bricks
Magnesia-alumina spinel bricks have strong resistance to erosion of alkali slag and metal solutions, and are widely used for lining high-temperature equipment such as cement kilns, glass furnaces, iron and steel furnaces, etc., and are especially suitable for harsh working conditions.