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White Fused Alumina For Refractory Suppliers China

When the cooling pipe is installed on the bottom sealing plate(best alumium oxide for glass blasting), oil can be used as the bottom cooling medium in order to prevent pipeline accidents and damage the carbon brick after water leakage. The main feature of the ceramic cup is to block the 1150 ℃ isotherm in the ceramic layer with the ceramic material of low heat conduction(white aluminium oxide 180/220), so that the carbon brick can avoid the brittle fracture zone of 800 ~ 1100 ℃.

White Fused Alumina For Refractory Suppliers China MOQ: 1 Ton! 19 Years Experience White Fused Alumina Supplier, 35,000m² Workshop Area, Free Samples, Fast Delivery!

If you want to buy white fused alumina for refractory, please click our products: White Aluminium Oxide for more information!

NMA bricks are used from above the bottom of the comprehensive furnace to below the level of the iron port (i.e. the dead iron layer area), and a layer of high aluminum protective bricks are laid in front to form a "simple ceramic cup" structure(brown fused alumina price), so as to avoid all kinds of damages to the NMA bricks at the beginning of the furnace opening(aluminum oxide blast media). The hearth wall is composed of two independent rings separated by a thick layer of mortar joint (about 60mm).

By September 1993, the average temperature difference between the inlet and outlet of the second section of the cooling wall is 0.3 ℃(black corundum), the heat flow intensity of 75% of the cooling wall is 6970w / m2, the hot metal does not contact with the carbon brick directly, and the temperature of the thermocouple at the furnace bottom has been stable between 100 ℃ and 200 ℃(silicon carbide 180 grit), which means that The function of Ming NMA brick has been shown. 

In the early 1980s, Savoie refractory company in France developed and installed a new type of composite lining in the blast furnace of Thyssen marketing company in Germany, which is called "ceramic cup"(pink corundum). When the NMA brick is not used in the blast furnace, the titanium bearing material is usually added to protect the furnace in about 9 months after the start-up(brown aluminum oxide 80 grit), and the titanium bearing material is put into the furnace in 18 months after the start-up (October 24, 1992).

Because of the existence of the ceramic cup, which alleviates the penetration and erosion damage of the hot metal and alkali metal to the carbon brick from the structural design(black silicon carbide manufacturers); At the same time, dianlai stone and brown corundum are all ceramic materials with low thermal conductivity, which have high permeability and erosion resistance(100 grit aluminum oxide). The lower end of the furnace bottom is the circulating water (or oil) cooling system, and the cooling pipe is buried in the carbon tamping layer.

The advantages of ceramic cup technology include: preventing molten iron from permeating(white fused alumina); reducing the circulating erosion of molten iron (with reasonable depth of dead iron layer); improving the overflow of molten iron (18-25c) and the thermal shock resistance of hearth. Because the ceramic cup has the above advantages, many new or overhauled blast furnaces abroad adopt this new structure. Compared with mullite brick, corundum block has better slag corrosion resistance.

When the cooling pipe is installed under the bottom sealing plate, circulating water cooling is generally used, and air cooling can also be used(white aluminum oxide). The lower part of furnace bottom masonry is vertical or horizontal carbon brick, and the upper part of carbon brick is mullite brick. The thermodynamic calculation shows that the best thickness ratio of high thermal conductivity material to low thermal conductivity material is 2 ~ 2.5(brown fused aluminum oxide manufacturers).

In order to maintain this proportion, the number of mullite brick layers is 1-2(white corundum). The outer ring is carbon brick (generally carbon brick or microporous carbon brick), and the inner ring is made of corundum. The thickness of radial brick in the iron port area is increased(120 grit aluminum oxide). The distance from the center line of the iron port to the upper surface of the bottom brick, i.e. the depth of the dead iron layer, is generally taken as 20% of the hearth diameter.

white aluminium oxide
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Brown Fused Alumina And White Fused Alumina MOQ: 1 Ton! 19 Years Manufacturing Exprience, 35,000m² Workshop Area, Factory Price, Free Samples, Fast Delivery!

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