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.

Refractory materials for aluminium melting furnace

The main equipment for thermal melting aluminum has calcinations sintering furnace, melting furnace and electrolytic cell. The rotary kiln firing with a lining of high aluminum brick masonry are commonly used, other parts available clay brick as a liner, insulation layer close to the furnace shell at laying a layer of refractory fiber felts and masonry a layer of light brick or light weight castable refractory pouring.

The most common aluminum smelting equipment is a reflective furnace. The lining of the molten aluminum contact. In general, the Al2O3 content is 80% ~ 85% of the high aluminum brick masonry, melting high purity aluminum metal, are advised to the mullite brick and corundum mullite brick. Some factories in hearth slope and scrap aluminum material, easy erosion and wear parts, the use of silicon nitride bonded silicon carbide brick masonry. Flow aluminum groove and an opening of the aluminum and other parts, aluminum melt erosion heavier, the general use of self bonding or silicon nitride combined silicon carbide brick masonry, and also useful zircon brick lining. The effect of the refractory fiber cone is better than that of the aluminum outlet. The lining does not contact the molten aluminum, using clay brick, fireclay refractory castable refractory material such as plastic or masonry. In order to speed up the melting speed and save energy, light brick, light refractory and refractory fiber products are widely used in the present work.

Aluminum smelting induction crucible furnace is more commonly used equipment, its lining generally use Al2O3 content is 70% ~ 80% of high alumina castable refractory ramming material production, but also useful for just corundum brick concrete lining of.

Aluminum molten liquid from the furnace outlet, the flow of aluminum trough. The slot liner generally adopts silicon carbide brick, useful also fused silica foam perform. Such as the use of precast block for tank lining, the surface should be coated fused silica or as protective layer with high alumina cement electric fused silica foam refractory castable.