Magnesium aluminum bricks have been plastic flowing from 1000 ° C, which is significantly significant at 1200 ° C. The flow accelerates at 1300 ° C. These are similar to the magnesium chromium bricks and are different from magnesium bricks, and the rapid flow temperature of magnesium bricks is 100 to 200 to 200. ℃. When the amount of alumina adds is less than 15%, the effect of magnesium aluminum bricks and iron oxide does not cause expansion, and the amount of adding reaches a micro -expansion when the addition is 15%; at 20%, it is more obvious; the expansion is severe at 28%.
Most of the magnesium bricks are used in the metallurgical industry. Due to good thermal stability and high temperature intensity of magnesium aluminum bricks, it is mainly used for important parts such as steelmaking flat furnaces. High -purity magnesium bricks are used in the easily eroded damage area of refining furnaces outside the furnace and outside the furnace. Magnesium carbon bricks are mainly used for important parts of converter, electric furnace and out -of -furnace refinement furnace. Magnesium silicon bricks or higher magnesium olive bricks containing SIO2 can be used for the heat storage room and cement rotary kiln of the flat furnace and glass melting kiln. The melting particles are combined with magnesium bricks, which are mostly used in the key parts of severe erosion in the electric furnace, out -of -furnace refining furnace and non -ferrous metal smelting furnace.
1. The chemical components of magnesium aluminum bricks vary from the raw materials. ——It is MGO> 81%, Al2O3 8.7%, SIO2 <6.0%, CAO <1.5%, Fe2O3 <1.0%.
2. Magnetic aluminum brick mineral composition. In its mineral composition, the main crystals are mainly magnesium stone. The matrix consists of magnesium, magnesium olives, calcium magnesium olives, and magnesium aluminum spinels.
3. The fire resistance of magnesium aluminum bricks and the softening temperature of the lotus weight. In the magnesium aluminum bricks, magnesium crystals and magnesium aluminum spinels of magnesium aluminum spinels form a network skeleton. It has the ability to resist high temperature and lotus weight. Therefore, the fire resistance and load softening temperature of magnesium and aluminum bricks are relatively high. The refractory resistance can reach 2100 ° C, and the softening temperature of the lotus is 1570 ° C.
4. The thermal expansion and thermal stability of the magnesium aluminum brick. Because the line expansion coefficient of the magnesium and aluminum spinels is small, the line expansion coefficient of magnesiumaluminum bricks is very small. In the range of 20? 1000 ° C, the line expansion coefficient of magnesium aluminum bricks is only 10.6 × 10-6 ℃ -1. Because magnesium aluminum spinels play a role in enhancing heat shocks in the bricks, the heat shock resistance of magnesium aluminum bricks is better, and the number of water cooling is more than 20 times.
5. The anti -slag resistance of magnesium aluminum bricks. Due to the high density of magnesium and aluminum bricks and low pores, Fang Magnesium is surrounded by magnesium and aluminum spinels. The ability to resist acidity and alkaline stab erosion is relatively strong.
