Electric Arc Furnace Lower Sidewalls

Electric arc furnace lower sidewalls can be constructed with the same quality refractory brick as used in the sub-hearth. The brick selected for the application should be in the 95% to 98% MgO class such as Perecon & Oxiline H. Lower sidewalls are usually referred to as the lower portion of the furnace sidewall from the bottom transition up to a number of courses below the slag line. 

When constructing lower sidewalls, the following sequence should be used:

1. Determine the required height from the construction drawing or from experience and place a mark at this point on the shell.
2. Determine the number of full courses required (keeping in mind the taphole elevation required) starting tap hole opening in the same manner as step 1.
3. In contoured subhearth construction was used, make sure lower sidewall base is level and that all voids have been filled.
4. Lay first-course snug, allowing a 1” space between the brick cold face and the steel shell for expansion.This space should be loosely filled with Rescomag Mix. Brick should be laid dry.
5. Continue laying each additional course in the same manner until the desired height is reached. Cut a brick to key rings

Electric Arc Furnace Slag line

Slag lines are generally referred to as the sidewall area that comes in contact with molten slag during the refining process. While this is normally considered to be the three courses below the sill line, the person in charge of operating the furnace should be consulted in locating this area. The slag line is one of the most severe wear areas in the furnace lining, magnesia-carbon brick such as Nuline 10-99 or Nuline 15 DFP is used. 

Electric Arc Furnace – Upper Sidewalls

The upper sidewall area is generally referred to as the part of the sidewall above the furnace slagline. Magnesia-carbon products such as Nuline 10-99 or Nuline 15 DFP are used.