Caustic calcined magnesite (Magnesium ball ) is made of ordinary light – burning magnesium powder after mixing. It is mainly used for BOF steelmaking and slag splashing to protect the BOF. The production of magnesium ball is mixed by 80% MgO powder with 20% water, then put it into a mixing mill for rolling, stirring and mixing 15 ~ 20 min to form a mixture, send people to press the ball mechanism through the belt conveyor to prepare products, and then pile up.