The characteristics of refractory fiber

1 high temperature resistant.

The highest use temperature up to 1250~2500 degrees. The most commonly used asbestos is 

only 500~550 degrees, 580~830 degrees C and slag wool, aluminum silicate fiber reaches more than 1000 DEG C.

2 conductivity is low.

Refractory fiber under high temperature thermal conductivity is very low, such as 1000 DEG C, thermal conductivity of aluminum silicate fiber only for clay brick lightweight clay brick 20%, 38%.

3 small volume densities.

Generally 0.1~0.2g/cm fand, general clay brick lightweight clay brick for 1/20~1/10, 1/10~1/5. Therefore, the application of industrial furnace refractory fiber instead of refractory brick, the furnace body weight, wall thickness. Such as heating furnace lining is reduced by 80%, the furnace wall thickness of 50%.

4 good chemical stability.

In addition to alkali, fluoride, sulphate, almost not affected by chemical erosion.

5 good thermal shock resistances.

Regardless of the fiber material or product, all brick incomparable good thermal shock resistance.

6 low thermal capacity.

1/72 heat capacity of fiber material only light refractory brick, clay brick 1/42. Refractory lining in the afternoon to do, heat loss is small, fuel saving, fast temperature rise, the intermittent operation furnace was love.

7 soft, easy processing.

Can be made into a variety of products and shape of parts, construction is convenient, the labor intensity is low, the effect is good.

Methods to decrease the porosity rate of refractory brick

Production of refractory  brick  is always encountered too many holes, how can we reduce the occurrence of this situation? Today we shall all requirements to introduce how to reduce the rate of porosity of refractory brick.

Selection of high density, low water absorption rate of the raw material, through the reasonable distribution is the key to prepare low porosity refractory brick. Refractory brick is used 50% of the soft clay and 50% hard clay clinker ingredients, according to a certain size requirements, forming, drying, firing at high temperature of 1300~1400 DEG C under the. Refractory mineral is mainly composed of kaolinite (Al2O3 – 2SiO2 – 2H2O) and 6%~7% impurities (potassium, sodium, calcium, titanium, iron oxide). The sintering process is mainly kaolinite continuous dehydration decomposition of mullite (3Al2O3 – 2SiO2) crystallization process. Refractory brick in SiO2 and Al2O3 on the sintering of eutectic of low melting point of silicate and impurities in the formation process of mullite crystals surrounded by around. In the process of baking temperature control at 1350 to 1380 DEG C, appropriate to increase the low porosity clay brick firing temperature (1420 C), refractory brick contraction increased slightly, so that the refractory brick density increases slightly, and low porosity can be reduced.

Refractory materials mainly used what place

Refractory material is the basis of materials in the field of high temperature technology. Department of applied very widely. Which is the most widely used in a variety of thermalequipment and high temperature in the container as resistance to high temperature structural material and lining. In the iron and steel metallurgy industry, coke oven is mainly composed of refractory materials. BF and hot blast furnace iron making steelmaking furnace, heating furnace, soaking pit, are absolutely indispensable in accordance with requirements of various refractory material. Not only the liquid steel casting to consume a large amount of refractory material, casting more need some high quality  refractory materials. Refining outside the furnace refractories have superior species would not be able to achieve. The statistical results show that the iron and steel industry is the most need the Department refractory material, accounting for about 60% of the total output of refractory materials. Smelting and processing of non-ferrous metals is also inseparable from therefractory material. High temperature operation Department of building materials industry and other silicate products, such as all the high temperature furnace glass industry, cement industry, ceramic industry and its lining must be made of refractory material to build. Other such as chemical industry, power, machinery manufacturing and other industrial high temperature operations in a variety of baking furnace, sintering furnace, heating furnace, boiler and flue, a chimney, protective layer must be refractory material.

In short, when some structures, apparatus, equipment or containers, in more than 1000 high temperature operation, because there may be a physical, chemical and mechanical effects, the deformation and the softening and melting material, or erosion, erosion, collapse or damage phenomenon, not only can make the operation could not be sustained. The service interruption, affect the production of materials, processing and pollution, affecting the quality of the products; it must adopt the refractory material with resistance to high temperature.