Appliion of Magnesium Chloride. Magnesium chloride used for Polishing abrasive bricks for Marble, granite, tiles, vitrified tiles, and other country stones, animal feed supplement (veterinary), Mgo fire proof board as well as decorative boards, known as Oxychloride bond, bonded emery stones, construction materials, animal nutrition veterinary, antacids – pharmaceuticals, danish stones ...