Three classification of refractory material according to temperature

Refractory material is a class of inorganic non metallic materials which the fire degree not lower than 1580 ℃. Refractoriness is refractory cone specimen under no load condition, resistance to high temperature without melting temperature in Celsius. Here we introduce three classification index of refractory material:

Can be divided into the ordinary refractory material: 1580 ~ 1770 ℃ refractoriness, refractoriness 1580 ~ 1770 ℃ is equivalent to Al2O315% ~ SiO2-Al2O3 two yuan in 45% refractory products, the main mineral composition of raw materials are the kaolinite.

Can be divided into high-grade  refractory materials:refractoriness 1770 ~ 2000 ℃, high aluminum bricks, magnesia brick, Mo to ordinary products, magnesia brick, of common magnesia chrome brick, brick belongs to this class of olive.

Can be divided into super refractory material: Refractory degree is higher than 2000 ℃, pure oxide products, casting products, high purity magnesia chrome brick, magnesia spinel brick, non oxide products belonging to this class.

Application of unshaped refractory materials

Unshaped refractory material is composed of reasonable distribution in the granular and powder and binder not forming and firing directly use of the refractories. Then what is the different unshaped refractory material application area, let us see it.

1. Ironmaking system.

• Alumina silicon carbide carbon refractory castable for blast furnace trough.
• As with hot-air burner refractory pouring castable lining.
• Torpedo type iron waterwheel partial or full using refractory castable, can also use refractory coating to repair.

2. Rolling system.

• All available unshaped refractory lining, steel forging heating furnace.

3. The steelmaking system.

• The cement rotary kiln.
• Glass tank furnace.
• Ceramic kiln.

4. Other industrial system.

• Petrochemical industry, ferrous metallurgy, fluidized bed boiler.

5. Building system.

• Refractory coating repair of BOF and eaf.
• Slag splashing.
• Alumina magnesia castable making converter lining.

Above is the simple introduction application of unshaped refractory materials, thank you for reading, more detailed information can contact us, we will try our best to answer your questions.

Application of refractory aggregate and powder in castable.

The unshaped refractory castable, refractory aggregate amount is generally 63%~73%, acting as a framework, can significantly affect the performance. Refractory powder dosage is 17%~37%, filling aggregate porosity and improve the construction resistance and so on. Some refractory powder, such as clay and ultra – fine powder, or a good bond. The ideal particle gradation is the gap caused by the coarse aggregate is just fine aggregate void filling, between the two has been refractory powder filled, no no surplus, to achieve the greatest packing density, in order to get the best performance.

Refractory aggregate divided into coarse and fine aggregate. Average particle size greater than 5mm is referred to as the coarse aggregate; 5mm and 5mm to 0.09mm is referred to as the fine aggregate. Habit will 5~0.15mm particles known as fine aggregate. Aggregate critical particle size depends on the thickness of the lining of the body, as shown in the following table. At present, the refractory critical particle size is reduced tendency, generally use 8mm or 5mm, pump feeding with 3mm. It should be noted that, in the preparation of unshaped refractory materials, the refractory aggregate gradation shall request the composite table technology.

In the production of unshaped refractory materials used as refractory materials, refractory aggregate and powder: bauxite, clay material, semi silica raw material, silicon material, magnesium material, kyanite group mineral raw materials, mullite, alumina, corundum, spinel raw material, silicon carbide, silicon nitride, chromium iron, zircon etc..

After the destruction of these refractory raw material, crushing, unshaped refractory materials to prepare the composite requirements of raw materials, to ensure the quality of the product, before use must be tested raw materials.

The development prospects of refractory ceramic fiber

Due to rising energy prices, fuel costs will become a bottleneck for the development of ceramic industry control, energy conservation is more important. The more people concerned about the furnace heat loss and, some directly in the original lining layer adhered to the refractory ceramic fibers to enhance thermal efficiency. In the add must be before the kiln wall obvious cracks or spalling parts repair. But the insulating refractory bricks and refractory fiber can not be arbitrary abuse. So far as the basic oxygen steelmaking furnace,

cement rotary kiln lining, due to the high temperature chemical erosion, temporarily can not be used for lining of fiber.

For the continuous heating equipment such as ceramic tunnel kiln, have realized the refractory ceramic fibers used as continuous heating equipment lining, according to some reports, the rapid push board kiln and tunnel kiln energy saving effects of the refractory ceramic fibers are very significant. Especially the ultra high temperature heating, such as sintering temperature in the furnace is 1538 ℃ - 1649 ℃, the best energy saving effects of the refractory fiber.

At present, the ceramic kiln equipment in Europe and America and Japan using all ceramic fiber lining. Not long ago, Japan will gas tunnel kiln decomposition such as carriage structure of segmented manufacturing, then to porcelain factory construction site assembly, all of this is due to the use of ceramic fiber material, greatly saves the cost of more convenient because of the kiln. To promote the study of effect of energy-saving ceramic fiber material modification products from the ongoing.