关键词: 氯化镁, 氧化镁, 无水氯化镁, 六氨氯化镁, 水氯镁石, 金属镁, 脱水

Abstract: Anhydrous magnesium chloride is the raw material of electrolyzed metal magnesium and an important intermediate of some catalyzers or medicines. Anhydrous magnesium chloride may be prepared from materials containing magnesium chloride such as magnesium chloride hydrate, carnallite or bittern by different dehydrating methods of organic solvent distillation or molecular sieve absorption, gas protective heating, discomposing the MgCl2-NH3 complex that can be composed from high boiling-point polar-solvent system, water-ammonia system, low boiling-point mixed-solvent system. On the other hand, anhydrous magnesium chloride may also be prepared by chloridizing magnesium oxide, which converted from magnesite, brucite, or Mg(OH)2, in gaseous medium, or molten salt medium. For several decade innovation, some progress has been made for the anhydrous magnesium chloride preparation. However it still needs more deep study to change the traditional technology from complex process, high cost, serious pollution and grievous eroding, into the green technology with simple process, low cost, non-pollution and non-eroding.

Key words: magnesium chloride, magnesium oxide, anhydrous magnesium chloride, magnesium chloride hexammoniate, bischofite, metal magnesium, dehydration