Used in refractories, ceramics, polishes, adhesives, paint, etc. Light magnesium oxide is mainly used for preparation of ceramic, enamel, refractory crucible ... and raw materials for refractory bricksHeavy magnesium oxide grinding rice industry for the firing and semi-rollerMedicine as ... .2 0.3 Fe % ≤0.05 0.05 0.06 magnesium oxide