中文摘要：

针对盐湖氯化钾与氯化镁资源的综合开发,提出以氯化铵做盐析剂分离氯化钾与氯化镁的设想,采用等温法测定了NH4Cl-MgCl2-KCl-H2O四元体系0℃时的稳定相平衡数据,依据湿渣法与X射线衍射相结合的方法对平衡固相组成进行鉴定,绘制了该体系0℃的稳定相图,发现存在7个共饱点和8个结晶区：MgCl2·6H2O、KCl、NH4Cl、KCl·Mg Cl2·6H2O、NH4Cl·MgCl2·6H2O、（K1-n,NH（4n））Cl、（NH4n,K1-n）Cl和（NH4n,K1-n）Cl·MgCl2·6H2O。依据相图分析和计算,设计了光卤石和NH4Cl为原料分离制备铵光卤石的新工艺,铵光卤石可用于无水氯化镁的生产。

英文摘要：

Ammonium chloride was used as a salting-out agent to separate magnesium chloride and potassium chloride for application of magnesium chloride and potassium chloride in salt lakes. Phase diagram of the NH4Cl-MgCl2-KCl-H2O quaternary system at 0℃ was studied isothermally. There are seven invariant points and eight solid phase crystallizing fields, which are： Mg Cl2·6H2O, KCl, NH4Cl, KCl·MgCl2·6H2O, NH4Cl·MgCl2·6H2O,（K1-n,NH4n）Cl,（NH（4n）,K1-n）Cl and（NH（4n）,K1-n）Cl·MgCl2·6H2O. Salt addition considerably enlarges crystallization areas of KCl and NH4Cl·MgCl2·6H2O. A new process to produce ammonium carnallite is designed based on the phase diagram, which can be used in the production of anhydrous magnesium chloride.