Refractory fire bricks for DC EAF bottom

There are two main types of DC EAF bottom anodes: conductive refractory type and metal element conductive type (steel rod type, multi-contact pin type, steel sheet type). No matter which type, it is characterized by refractory as the main conductor, and the life of the anode at the bottom of the DC EAF is actually the life of the refractory at the bottom of the furnace. Therefore, the conductive refractory material at the bottom of the furnace is one of the key materials for the normal operation of the DC EAF. There are two main types of DC EAF bottom anodes: conductive refractory type and metal element conductive type (steel rod type, multi-contact pin type, steel sheet type). No matter which type, it is characterized by refractory as the main conductor, and the life of the anode at the bottom of the DC EAF is actually the life of the refractory at the bottom of the furnace. Therefore, the conductive refractory material at the bottom of the furnace is one of the key materials for the normal operation of the DC EAF.
As a furnace bottom conductive refractory material, it should meet the following conditions:
①Low resistivity;
② low thermal conductivity;
③The change of resistance with temperature is small;
④Good thermal shock resistance and slag resistance;
⑤ Long service life and low consumption.
In order to meet the above conditions, conductive magnesia carbon bricks are directly built on the copper plate of the conductive furnace bottom, and a layer of ramming material with good conductivity is covered on the built furnace bottom with a thickness of about 150mm. In the production process, it can be repaired with carbon-containing magnesium materials. This kind of refractory furnace bottom can be repaired both cold and hot, and its service life is longer than other furnace types.

For magnesia-carbon bricks that meet the requirements of the above-mentioned conductive furnace bottoms of DC EAFs, only when the key material (graphite) in MgO-C bricks reaches a certain amount of residual carbon, and a carbon-containing bonding matrix is used, higher conductivity can be obtained.