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Black Silicon Carbide Powder Manufacturers Germany

Its use effect and life are directly related to the normal production of the blast furnace and the life of the first generation(brown fused alumina). Therefore, countries generally pay attention to the selection of the material of the cooling wall, the improvement of the structure, etc., the purpose is to extend the service life of the cooling wall(green silicon carbide). The cooling wall is a wall-shaped cooler wrapped around the furnace lining and bolted to the furnace shell.

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Stave is an important cooling device for the blast furnace cooling system(brown aluminum oxide). It is mainly used in the blast furnace body, waist, belly, hearth and other parts. It uses HT15 ~ 33 gray cast iron to cast cold-drawn seamless steel pipe of No. 20 steel. The outer diameter of the steel pipe is 34 ~ 44.5mm and the wall thickness is 4.5 ~ 6mm(aluminum oxide abrasive).  From the original (first generation) stave to the second generation, Nippon Steel has enhanced corner cooling and forced water cooling instead of steam cooling.

It is made into a serpentine pipe with a center distance of 100 ~ 200mm, which is generally protected by cast iron(brown aluminium oxide). The thickness of the layer is 25 ~ 39mm, so the thickness of the smooth cooling wall is usually 80 ~ 110mm(aluminum oxide grit). The lead-out part of the water pipe must be cast into a protective sleeve and welded to the furnace shell to prevent the expansion of the cooling pipe to cut off the water pipe after the furnace is opened, and then re-cast the mold.

In order to avoid brittle cracking caused by high temperature molten iron carburizing the steel pipe during casting, it is necessary to apply a quartz powder coating to the pipe wall after rust removal(brown fused alumina price). The temperature of the molten iron should be lowered to 1220 ℃ and then cast(synthetic corundum). Due to the good thermal conductivity of cast iron, ferrite ductile iron is used instead of high chromium cast iron; the water pipe cooling wall need not be arranged too densely.

The smooth plate cooling wall is generally used in the hearth, and has been verified by most blast furnaces to meet the requirements(white alumina). Compared with the smooth plate cooling wall, it is wear-resistant, scour-resistant, and easily generates slag skin. The larger the heat flow, the thicker the brick entanglement, and the larger the area of the brick, the higher the temperature of the cast iron rib(emery abrasive). Generally, it is preferably not greater than 500 ° C. 

 Nippon Steel's improvements to the first to fourth generations of the former Soviet Union's stave(black corundum). This improvement promotes larger furnaces cooled by staves. Generally, the area of inlaid tiles is about 50%, thickness is 150 ~ 230mm, too thin and easy to fall off, too thick will cause the casting stress between the cast iron bars and the cast iron plate to be too large and crack, and the iron bars will burn out when the heat flow fluctuates(white fused alumina for refractory). Burn out.

After practical application, the damage of the four corners of the cooling wall has improved, but there is still more damage between the upper and lower cooling walls(pink corundum). Therefore, the brick-inlaid cooling wall is mostly used for the furnace belly, the furnace waist, and the lower part of the furnace body(brown aluminium oxide 24 mesh). The research and development of cooling stave in Japan has gone through the first, second, third and fourth generation processes.

The Nippon Steel Cooling Wall (second generation) has made the following improvements: the bending radius of the water pipe in the cooling wall is minimized(silicon carbide abrasive); the texture of the braided brick is changed from clay brick to high alumina brick; The "1" shaped part of the masonry is cooled by a separate system of water pipes(white aluminum oxide grit). In terms of the thermal aspects of the mosaic cooling wall, the surface temperature of the casting rib is an important parameter.

white aluminium oxide
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