采用轻烧镁粉、轻烧白云石粉或加入含碳原料高压成球。用于转炉溅渣护炉，可大幅度提高转炉炉衬寿命，改质剂可以调整炉渣成份。
     It’s made from caustic calcined magnesite powder、caustic calcined dolomite powder\adding carbon material,high pressure pellet,mainly used in protection furnace in splashing slag with long service life.