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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. shu

Preparation of Anhydrous Magnesium Chloride via Gas-solid Reaction of Ammonium Carnallite

1.
a School of Metallurgical Science and Technology, Central South University, Changsha 410083;
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b Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414000;
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c Zhuzhou Institute of Technology, Zhuzhou

Corresponding author: ZHOU Ning-Bo,
Received Date: 6 September 2004
Available Online: 29 March 2005
Fund Project: 青海省重大科技攻关项目(2002-G-101) (2002-G-101)

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.
- ammonium carnallite,
- gas-solid reaction,
- anhydrous magnesium chloride,
- preparation
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