The difference between anti-peeling high-alumina brick and ordinary high-alumina brick

Refractories are widely used in metallurgy, building materials, chemicals, petrochemicals and machinery manufacturing and other industrial areas, play an active role in the national economy. However, the application of refractories in high-temperature furnace evaluation, in addition to improving the service life, lower kiln energy consumption, it should also contain refractories in the production process of their own energy-saving, that is selected in the production of low-temperature firing, the product has the appropriate Of the high-temperature characteristics and low thermal conductivity.

Compared with the traditional high alumina brick, the thermal shock resistance is high, the strength is high, the chemical resistance is low, the coefficient of thermal expansion is low, the thermal conductivity is low, the firing temperature is low, and the material function is greatly improved. Consumption.

From the following aspects to clarify the problem:

First, the lower firing temperature 150 ~ C. Because of high temperature firing and insulation, especially in the greater than 1450 ℃ after the refractory refractory energy consumption can be infinite, according to the present refractory brick high-alumina brick 300,000 t / a count, estimated savings of 50,000 tons of standard coal.

Second, compared with the traditional high-alumina bricks, anti-shedding high-alumina brick thermal conductivity value of the former 2/3, or even lower, compared with magnesium chrome brick, as long as 1/3 ~ 2/3. Anti-shedding high-alumina brick and adjacent alkaline brick, lower carcass surface temperature 75-98 ℃, preliminary accounting can save nearly 2000t / a standard coal. Saving effect, considerable economic benefits.

Third, the traditional high-alumina brick can not enter the large-scale dry kiln, due to the use of life is too low, repair, stop kiln frequently form considerable energy loss and economic losses. More noteworthy is that it can not overcome the inherent weaknesses in the use of harsh locations.

Fourth, the world today with the rapid development of industry, to the formation of the Earth's environmental pollution infinite economic losses, the serious problems of human health has been more and more people's attention. In order to make a long life, we must take into account the material itself can not be a source of pollution. The excellent function of anti-shedding high-alumina bricks can largely replace the magnesia-chrome bricks. Magnesia-chrome brick in the course of processing and waste brick processing will bring serious "chromium pollution", its scientific component is carcinogenic substances. In Europe and the United States has gradually abandoned the production and use of this material, and quickly developed in the development of chromium-free goods, and anti-shedding high alumina brick is an excellent alternative.

The anti-drop high alumina brick is successfully used in the relevant parts of the cement kiln and used in the large-scale float glass kiln regenerator, instead of the traditional magnesia chrome brick, not only prolongs the kiln service life, but also eliminates the chromium pollution. In addition, the anti-shedding high-alumina brick firing temperature than magnesium-chrome brick low about 300 ℃, energy-saving effect is considerable.

Anti-shedding high-alumina brick as a versatile and efficient new energy-efficient refractory material, the American Ceramic Society magazine will be informed of this material as "the development of a potential by China's new high-alumina refractories." Anti-shedding high-alumina brick in the metallurgical and building materials industry has a wide range of applications.

A Brief Introduction of AOD Refractories

Now magnesia-chromite brick, magnesia-dolomite brick, dolomite brick are the main products used for AOD lining.

There are natural dolomite at good quality in Europe, there calcined dolomite brick to are used generally to construct AOD lining. And magnesia-dolomite brick added with zirconia is used for tuyere, calcined dolomite brick with magnesia is used for slag line. For steel-tapping spout, magnesia carbon materials and magnesia dolomo carbon brick are widely used.

The corrosion resistance ability of magnesia chrome brick is high for high alkaline slag with magnesia and low alkaline residue with chrome, it’s the best choice for furnace whose slag composite changes are big, and it is widely used in Japan and America. While because magnesia chrome brick is expensive and chrome can do damage to the environment, so such kind of refractory brick is used less and less in the recent years. Only a small amount of small converters which don’ t work continuously use magnesia chrome brick.

Compared with the past magnesia chrome brick, dolomite brick is cheaper, but its serving life is also shorter.

Nowadays because magnesia calcium brick has good high-temperature resistance, slagging resistance and thermal shock resistance, and also it can purify molten steel. So it is gradually used in jumbo furnace which works continuously, and a trend of taking place of other refractory bricks seems to happen.