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Preparation of Anhydrous Magnesium Chloride from Magnesium Chloride Hexahydrate

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Abstract

A method was proposed for the preparation of high-purity anhydrous magnesium chloride by using magnesium chloride hexahydrate and ammonium chloride as raw materials, and alumina as covering agent. X-ray diffraction was employed to investigate the process. The mechanism involved in the process was proposed. The factors affecting the purity of anhydrous magnesium chloride were investigated. Dehydrated ammonium carnallite was formed in the process to facilitate the dehydration process. Alumina as covering agent can guarantee that the formation of high-purity anhydrous magnesium chloride was obtained. The content of magnesia in anhydrous magnesium chloride was 0.02 pct under the optimum conditions: molar ratio of ammonium chloride to dehydrated magnesium chloride was 2:1, thickness of alumina 1.3 cm, reaction temperature 723 K (450 °C), reaction time 1 hour, and the number of crystallized water 0.6 to 2.2.

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Authors and Affiliations

  1. State Key Laboratory of Multi-Phase Complex Systems, Institution of Process Engineering, Chinese Academy of Science, Haidian District, Beijing, 100190, P.R. China

    Zhimin Zhang (Ph.D.), Xuchen Lu (Professor), Feng Pan (Ph.D.), Yun Wang (Master) & Suping Yang (Master)

  2. Graduate University of Chinese Academy of Science, Beijing, 100049, P.R. China

    Zhimin Zhang (Ph.D.), Feng Pan (Ph.D.), Yun Wang (Master) & Suping Yang (Master)

  3. United Research Center for Resource and Materials, Wuhai, 016000, P.R. China

    Xuchen Lu (Professor)

Authors
  1. Zhimin Zhang
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  2. Xuchen Lu
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  3. Feng Pan
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  4. Yun Wang
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  5. Suping Yang
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Correspondence to Xuchen Lu.

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Manuscript submitted April 23, 2012.

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Zhang, Z., Lu, X., Pan, F. et al. Preparation of Anhydrous Magnesium Chloride from Magnesium Chloride Hexahydrate. Metall Mater Trans B 44, 354–358 (2013). https://doi.org/10.1007/s11663-012-9777-5

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