引用本文:
周宁波, 陈白珍, 何新快, 李义兵. 铵光卤石气固反应法制备无水氯化镁[J]. 应用化学,
2005, 22(8): 874-878.
Citation: ZHOU Ning-Bo, CHEN Bai-Zhen, HE Xin-Kuai, LI Yi-Bing. Preparation of Anhydrous Magnesium Chloride via Gas-solid Reaction of Ammonium Carnallite[J]. Chinese Journal of Applied Chemistry, 2005, 22(8): 874-878.
Citation: ZHOU Ning-Bo, CHEN Bai-Zhen, HE Xin-Kuai, LI Yi-Bing. Preparation of Anhydrous Magnesium Chloride via Gas-solid Reaction of Ammonium Carnallite[J]. Chinese Journal of Applied Chemistry, 2005, 22(8): 874-878.
铵光卤石气固反应法制备无水氯化镁
English
Preparation of Anhydrous Magnesium Chloride via Gas-solid Reaction of Ammonium Carnallite
Abstract:
Ammonium carnallite was synthesized with a >85% yield by a process in which a mixture of hydrated magnesium chloride from the salt lake and ammonium chloride solution at a 11 molar ratio was dehydrated to some extent at 160℃ for about 4 h.Dehydrated ammonium carnallite and solid ammonium chloride were mixed at a 14 mass ratio,and the ammonium chloride in the mixture was decomposed into NH3 and HCl,in which the pressure of NH3 reached 30.5 kPa and dehydrated ammonium carnallite was dehydrated by NH3 at 410℃,and finally the anhydrous magnesium chloride was calcined at 700℃.The result shows that magnesium oxide in the anhydrous magnesium chloride was less than 0.1% by mass.The XRD pattern and SEM micrograph demonstrate that the ammonium carnallite and the anhydrous magnesium chloride crystals were respectively homogeneous,the grains of them big and well-distributed.The anhydrous magnesium chloride thus produced can be used for the production of magnesium metal through electrolysis.
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Key words:
- ammonium carnallite
- / gas-solid reaction
- / anhydrous magnesium chloride
- / preparation
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