Due to the special design dimensions of refractory bricks for the bottom of the converter, a large amount of processing, polishing and adjustment is required during masonry. If the operation is directly carried out in the converter of a steel plant, it is difficult and cumbersome to operate. Therefore, after the general refractory company has produced the furnace bottom bricks, it needs to pre-lay (referred to as pre-laying) in the company, and perform preliminary processing and adjustment to meet the furnace bottom design requirements. Ramming material