EAF roof damage mechanism and applicated refractory materials

It is mad of high temperature' electrical calcined anthracite as main a material, medium temperate pitch as binder, through forming, high temperature baking, final precision machining. It features good thermal conductivity and alkaline resistance. It is economic and practical, and mainly applied for blast furnace bottom.

EAF Roof is a spherical structure with electrode hole and smoke output hole. Out part is called main roof, and the mid part is called small roof (also called triangle). When loading raw material, the roof can be removed. EAF process is extremely complex, triangle preform conditions are very harsh. Mainly by the electrode arc radiation, thermal shock, high-speed air stream of molten steel ....................

read more:
http://www.yilongrefractory.com/news/EAF%20roof%20damage%20mechanism%20and%20applicated%20refractory%20materials.html

How to recycle refractories?

In a word: Recycle the refractory materials by decomposing them.

The type of refractory materials used in a furnace differs by the position. All kinds of used refractories mixed together make it hard to keep good quality, so it is necessary to classify refractories before reusing them. They can be classified by magnesia, alumina, carbon-based, non-carbon-based.

In addition, for the dissimilar materials or iron mixed in, we can use some ways to pick them out, such as the method of magnetic separation. First, the used refractory materials should be crushed to 200mm~ 400mm, and then reduce to smaller than 20mm after impacting, compression or snipping, so as to be easy used.

For the refractories mixed with iron, we can use the way of electromagnetic separation, on the effect of magnetic strength higher than 12000 GS, making the content of iron in the used refractories with the size of 5~10mm less than 2%. While reusing the slit after crushing and after removal of iron powder as raw materials, we should classify them by particle size. The classification is generally done by using some metal mesh sieves, put the large mesh screen in the above and the small mesh screen under the large ones, keep continuously screening. In the process of crushing, grinding and classification, we should notice that not let the dust spread, sealing the device and recycling refractories in duster. The left dust also can be added to raw materials of landscape bricks.