... ceiling, floor tile, magnesium oxide cement, ventilation pipes, security covers, fireproof doors, fireproof board, wall panels, ... to produce high-quality magnesium-watt, high-quality fireproof board, magnesium system, packing, magnesium system, decorative board, light wall, ... Agriculture: It can be used as magnesium fertilizer, potassium magnesium fertilizer and cotton defoliants.3. Transportation. ...