无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (4): 100-103.doi: 10.19964/j.issn.1006-4990.2021-0384

• 研究与开发 • 上一篇    下一篇

三元体系NH4Cl+MgCl2+H2O 323.2 K相平衡研究

陈帅1(),杨博1,陈念粗1,罗军1,任思颖1,曾英1,2,于旭东1,2()   

  1. 1.成都理工大学材料与化学化工学院,四川成都 610059
    2.矿产资源化学四川省高等学校重点实验室
  • 收稿日期:2021-06-18 出版日期:2022-04-10 发布日期:2022-04-18
  • 通讯作者: 于旭东
  • 作者简介:陈帅(1995— ),男,硕士,研究方向为相平衡与相图;E-mail: chenshuaic413@126.com
  • 基金资助:
    四川省科技厅应用基础面上项目(2017JY0191);四川省大学生创新创业训练计划项目(202110616004)

Study on phase equilibria of ternary system NH4Cl+MgCl2+H2O at 323.2 K

CHEN Shuai1(),YANG Bo1,CHEN Niancu1,LUO Jun1,REN Siying1,ZENG Ying1,2,YU Xudong1,2()   

  1. 1. College of Materials and Chemistry & Chemical Engineering,Chengdu University of Technology,Chengdu 610059,China
    2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institution
  • Received:2021-06-18 Online:2022-04-10 Published:2022-04-18
  • Contact: YU Xudong

摘要:

采用等温溶解平衡法开展了323.2 K时三元体系NH4Cl+MgCl2+H2O的相平衡研究,测定了平衡固液相组成及密度,并绘制了该三元体系相图。研究发现:该体系323.2 K时有复盐NH4Cl·MgCl2·6H2O生成,相图包含2个共饱点(F1F2)、3条单变量曲线(AF1F1F2F2B)、3个结晶区(NH4Cl、MgCl2·6H2O、NH4Cl·MgCl2·6H2O)。对比该体系273.2、298.2、323.2 K时的相图可知:随着温度升高,NH4Cl和MgCl2·6H2O结晶区变小,NH4Cl·MgCl2·6H2O结晶区变大,同时NH4Cl·MgCl2·6H2O由不相称复盐转变为相称复盐,对应的不相称共饱点转变为相称共饱点。

关键词: 相平衡, 三元体系, 溶解度, 铵光卤石

Abstract:

The stable phase equilibria of the ternary system NH4Cl+MgCl2+H2O was determined by isothermal dissolution equilibrium method at 323.2 K.The density,equilibrium composition solid and liquid phase were determined and the phase diagram of the ternary system was plotted.The results showed that double salt NH4Cl·MgCl2·6H2O was formed at 323.2 K,and its phase diagram consisted of two invariant points(F1,F2),three univariate curves(AF1,F1F2,F2B) and three crystallization zones(NH4Cl,MgCl2·6H2O,NH4Cl·MgCl2·6H2O).By comparing the phase diagrams at 273.2,298.2,323.2 K,it could be found that with the increase of temperature,the crystallization zones of NH4Cl and MgCl2·6H2O becomed smaller,the crystallization zone of NH4Cl·MgCl2·6H2O becomed larger.Meanwhile,the type of double salt NH4Cl·MgCl2·6H2O changed from the incommensurate to the commensurate type,therewith,the corresponding incommensurate invariant point changed to the commensurate type.

Key words: phase equilibria, ternary system, solubility, ammonium carnallite

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