High alumina refractory brick for hot blast furnace

Hot air furnace is insulation and withstand high temperature load, so to determine the various parts of the furnace lining refractory brick material and thickness of, should according to the requirements of masonry bearing temperature, load and heat insulation and flue gas of masonry of physical and chemical action condition and decide.

The has good resistance to creep and corrosion resistance, domestic use of high aluminum brick containing Al2O3 with greater than 65% is adopted abroad of SiO2 94~96% siliceous refractory brick is with or containing Al2O3 72%~76% mullite refractory brick using high temperature zone of the upper 30% to 40% of the height of hot air furnace lining refractory bricks. According to the experiment, under the condition of 0.2MPa, 1550 and 50h, the former is 0%~0.5%, the latter is 0.1%~0.3%, and so the creep resistance is good. The brick arch with the thermal shock resistance is better, so as to avoid peeling and cracking. For the middle and lower part of the refractory brick should be considered to the compressive strength, the general use of clay brick and high alumina brick. Selection of heat insulation material should pay special attention to the work of the hot surface temperature should not be higher than the allowable temperature. Insulation wall and the upper part of the vault generally use diatomite refractory brick or lightweight clay brick.