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Materials and Manufacturing Processes Volume 28, 2012 - Issue 1
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Original Articles

Preparation of Anhydrous Magnesium Chloride from Ammonium Carnallite

Zhimin Zhang State Key Laboratory of Multiphase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, China; Graduate University of Chinese Academy of Science, Beijing, China
,
Xuchen Lu State Key Laboratory of Multiphase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, China; United Research Center for Resource and Materials, Wuhai, ChinaCorrespondence[email protected]
,
Suping Yang State Key Laboratory of Multiphase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, China; Graduate University of Chinese Academy of Science, Beijing, China
,
Feng Pan State Key Laboratory of Multiphase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, China; Graduate University of Chinese Academy of Science, Beijing, China
&
Yun Wang State Key Laboratory of Multiphase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, China; Graduate University of Chinese Academy of Science, Beijing, China
Pages 5-9 | Received 19 Jun 2012, Accepted 26 Jul 2012, Published online: 10 Jan 2013
 
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Abstract

High-purity anhydrous magnesium chloride was prepared by using ammonium carnallite as starting material and alumina as covering agent. X-ray diffraction (XRD) analysis and thermogravimetric analysis and differential calorimetry analysis (TG-DSC) analysis were employed to characterize the process. The mechanism involved in the process was proposed and discussed. The factors affecting the purity of anhydrous magnesium chloride were investigated. The results reveal that the mass fraction of magnesia in anhydrous magnesium chloride could reach 0.08% under the optimum conditions: alumina with the thickness of 1.3 cm was put on top of dehydrated ammonium chloride (NH4Cl · MgCl2 · 1.2H2O), and then the sample was maintained at 450°C for 1.5 h. After that, the sample was calcined at 700°C for 1 h.

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