NH_4Cl-CaCl_2-H_2O三元体系相平衡研究  

Phase equilibrium of the ternary system of NH_4Cl-CaCl_2-H_2O at 25℃,50℃ and 75℃

作　　者：袁俊生[1,2] 李霞[2] 刘燕兰[1,2] 

机构地区：[1]海水资源高效利用化工技术教育部工程研究中心,天津300130 [2]河北工业大学,天津300130

出　　处：《化工矿物与加工》2010年第6期4-8,共5页Industrial Minerals & Processing

基　　金：国家科技支撑计划项目(2006BAB03A10);河北省自然科学基金项目(B2007000008)资助项目

摘　　要：采用湿渣法测定了NH4Cl-CaCl2-H2O三元体系在25℃、50℃和75℃时的相平衡数据,并绘制了相图。结果表明,在25℃时,该体系相图存在NH4Cl和CaCl2.6H2O两个单结晶区、NH4Cl与CaCl2.6H2O共晶区。在50℃和75℃时,该体系相图存在NH4Cl、2NH4Cl.CaCl2.3H2O和CaCl2.2H2O三个单结晶区,NH4Cl与2NH4Cl.CaCl2.3H2O及2NH4Cl.CaCl2.3H2O与CaCl2.2H2O两个共结晶区。在该三元体系中首次发现了一种新的水合复盐2NH4Cl.CaCl2.3H2O。The equilibrium data on the ternary system of NH4Cl- CaCl2 - H2O at 25 ℃, 50 ℃ and 75 ℃ were investigated by using the wet - residue method, and the phase diagrams of the system were plotted. The experimental results show that there are two pure phase crystal areas of NH4Cl and CaCl2 ·6H2O and their mixture phase crystal areas at 25 ℃, and there are three pure phase crystal areas of NH4Cl, 2NH4ClCaCl2·3H2O and CaCl2·2H2O, two mixture phase crystal areas of NH4Cl and 2NH4Cl·CaCl2 ·3H2O, and 2NH4Cl-CaCl2 ·3H2O and CaCl2·2H2O in the system at 50 ℃ and 75 ℃ A newhydration double salt （2NHCl· CaCl2· 3H2O） was found in the ternary equilibrium system for the first time.

关 键 词：氯化钙 氯化铵 相平衡 

分 类 号：TD971[矿业工程—选矿]