Increasing the crystal size of periclase in magnesia can reduce the reactivity of magnesium oxide with carbon slag. Magnesia-calcium sand is beneficial to improve the slag resistance service life of refractories. Magnesium-calcium synthetic sand In recent years, large crystalline magnesia has attracted more more attention. Figure 1 shows the resin-bonded asphalt-bonded MgO-C bricks produced sintered magnesia used for the trunnion upper cone of the alkaline oxygen converter The relationship between the crystal size of periclase the erosion rate when it is used. It clearly shows that the use of large crystalline magnesia can reduce the erosion rate of MgO-C bricks by one third.