【摘要】 采用盐湖水氯镁石和生产镁砂副产的氯化铵为原料按MgCl2与NH4Cl的量比为1∶1混合,在一定条件下合成铵光卤石,铵光卤石产率大于85%。铵光卤石在160℃脱水4h成低水铵光卤石。低水铵光卤石与固体氯化铵按质量比为1∶4混合,高温下使反应体系中NH3的分压达30.5kPa以上,在410℃脱水和700℃煅烧成无水氯化镁。分析结果表明,制得的无水氯化镁中氧化镁的质量分数小于0.1%。X射线衍射和电镜测试技术结果证明,制得的铵光卤石和无水氯化镁无杂相,颗粒大而均匀,分散性好,适合于电解制备金属镁。更多还原

【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.更多还原