In order to make balance the damage of the furnace wall and prolong the service life, furnace wall is also used inlaid water cooling box or water cooling measures. The inner surface of the furnace is sprayed with a layer of fire-resistant coating to make the dross form a protective layer, which can reduce the unit consumption of the refractory material. effectively. But the energy consumption is relatively increased.
(3) Refractories for bottom of electric ARC furnace
Knotted lining use good sintered magnesia or fused magnesia, there is working lining and permanent lining under the ramming layer.The working lining use tar pitch bonded magnesium bricks magnesia brick, and permanent lining is generally use magnesia brick. The slag line parts upper the dike slag line parts,as slag erosion is serious,now more use the lining brick what same or similar the furnace wall hot spots,such as casting magnesia-chrome brick or re-combination magnesia-chrome brick. The effect is better when use of magnesia carbon brick, the service life can be as high as 100 to 200 furnace times.
The anode end of the direct current electric arc furnace is connected with the contact piece of the furnace bottom, the bottom of furnace use thermal conductivity refractory material or metal components to solve the problem of conduction, the main requirements of the conductive refractory is low resistance (10-4 ~ 10-2 Omega . m) and the resistance must be stable, usually using combination asphalt with resin ,magnesia-carbon bricks having a carbon content of preferably 10% to 18% are used as the conductive refractory, and include permanent lining, working lining and a protective coating. Working lining use magnesia ramming compound.
(4) Refractories for taphole
In 1980s, the advantages of tapping port are: The tilting electromechanical equipment has been canceled, the area of the water-cooling wall has been expanded, the damage of lining has been eased, the temperature of tapping steel can be reduced and the time of tapping can be reduced, thus reducing investment and saving electric energy. people use resin-bonded magnesia-carbon brick as taphole bricks, magnesia carbon brick as tube brick, and people use magnesia carbon brick or Al2O3-C-SiC brick as end brick. In order to make the melton steel flow out more successfully, usually people use olivine-based coarse sand as drainage material.