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Preparation of anhydrous magnesium chloride in a gas-solid reaction with ammonium carnallite |
| Zhou Ningbo1, Chen Baizhen2, Li Yibing2, He Xinkuai3 |
| 1.Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China; School of Metallurgical Science and Technology, Central South University, Changsha 410083, China;; 2.School of Metallurgical Science and Technology, Central South University, Changsha 410083, China;; 3.School of Metallurgical Science and Technology, Central South University, Changsha 410083, China; Zhuzhou Institute of Technology, Zhuzhou 412008, China; |
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Abstract Dehydrated ammonium carnallite was synthesized with bischofite from salt lake and ammonium chloride solution in a 1:1 molar ratio of MgCl2:NH4Cl, dehydrated at 160ºC for about 4 h. The yield was above 85%. The product was then mixed with solid-state ammonium chloride with a 1:4 mass ratio for the further dehydration at 410ºC. The decomposition of NH4Cl made a pressure of NH3 at 30.5 kPa to prevent the hydrolysis of ammonium carnallite. The anhydration of magnesium chloride was achieved at 700ºC. The results showed that anhydrous magnesium chloride contains magnesium oxide in an amount that was less than 0.1% by weight. XRD pattern and SEM micrograph showed a good dispersion of ammonium carnallite and anhydrous magnesium chloride crystals with well-distributed big grains, just enough to meet the need for the production of magnesium metal in the electrolysis process.
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Issue Date: 05 December 2006
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