Electric furnace roof prefabricated with special high-alumina materials, fused corundum, chromium oxide and a variety of additives as the main raw material, the prefabricated, dry and other processes from the production. With high temperature strength, anti-peeling performance and slag erosion performance, easy assembly, long service life. It is suitable for use in the top triangular area of the furnace and the working area of LF furnace.
Electric furnace cover with refractory bricks require good thermal shock resistance, high temperature splash on the erosion resistance, as well as good integrity, solid structure is not crack and so on.
Electric furnace lid with refractory material development trend is: brick - prefabricated block - the overall pouring, the specific conditions of different countries, the use of materials are not the same.
For alkaline firebrick cover, electric tile with magnets. In order to ensure the stability of the furnace cover structure and reduce the deformation and peeling of magnesia, the use of iron plaster or masonry insert iron. As the metal induced current (especially high power electric furnace cover), the formation of local overheating to non-magnetic steel brick, on the other hand pure magnesia brick linear expansion coefficient is too large, the amount of small.
In addition, the whole pouring the lid. The use of the overall casting furnace lid to promote the life of the furnace to further improve. After the water is cooled, the electrode is also water-cooled around the electrode, and the high-alumina ultra-low cement castable containing 3% Cr2O3 is added from the material and the stainless steel fiber is added. The furnace cover is used in the case of slightly repaired 594 furnace and service life is 4 times than before.