高等学校化学学报

高等学校化学学报

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298.16 K时Na+, Mg2+//Cl-, SO42-, NO3-, H2O体系中NaCl饱和区域相平衡

黄雪莉, 马凤云, 孙红梅   

  1. 新疆大学化学化工学院, 乌鲁木齐 830046
  • 收稿日期:2007-05-28 修回日期:1900-01-01 出版日期:2008-02-10 发布日期:2008-02-10
  • 通讯作者: 黄雪莉

Liquid-solid Phase Equilibrium for the Quinary System Na+, Mg2+//Cl-, SO42-, NO3-, H2O Saturated with NaCl at 298.16 K

HUANG Xue-Li*, MA Feng-Yun, SUN Hong-Mei   

  1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
  • Received:2007-05-28 Revised:1900-01-01 Online:2008-02-10 Published:2008-02-10
  • Contact: HUANG Xue-Li

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摘要： 采用等温溶解平衡法研究了五元体系Na+, Mg2+//Cl-, SO42-, NO3-, H2O在298.16 K下氯化钠饱和平衡体系的溶解度, 获得了相应的投影干盐图、氯图和水图. 研究结果表明, 在298.16 K下氯化钠饱和时, 该五元体系投影干盐图由8个二盐共饱和的双变面、13条三盐共饱的单变线和6个四盐共饱的零变点构成, 存在两种复盐, 8个二盐共饱双变面分别对应于NaCl+NaNO3, NaCl+Na2SO4, NaCl+MgCl2·6H2O, NaCl+MgSO4·Na2SO4·4H2O, NaCl+Mg(NO3)2·6H2O, NaCl+NaNO3·Na2SO4·2H2O, NaCl+MgSO4·7H2O 和NaCl+MgSO4·(1—6)H2O. 讨论了该相图在新疆硝酸盐矿开发利用过程中的应用.

关键词: 五元体系, 卤水, 硝酸盐, 相平衡

Abstract: Solubilities in the system Na+, Mg2+//Cl-, SO42-, NO3-, H2O saturated with NaCl were investi-gated by isothermal method at 298.16 K. According to the experimental data, the solvent-free, NaCl-free and water projection phase diagrams of this system were plotted. In this system, eight crystallization fields with two saturated salts were observed: MgSO4·Na2SO4·4H2O+NaCl, NaNO3+NaCl, NaNO3·Na2SO4·2H2O+NaCl, MgCl2·6H2O+NaCl, Na2SO4+NaCl, Mg(NO3)2·6H2O+NaCl, NaCl+MgSO4·7H2O and MgSO4 ·(1—6)H2O+NaCl. The respective crystallization areas are being separated from each other by thirteen univariant curves with three saturated salts which intersect in six invariant points corresponding to NaCl+Na2SO4+Na2SO4·MgSO4·4H2O+Na2SO4·NaNO3·2H2O, NaCl+NaNO3+Na2SO4·MgSO4·4H2O+Na2SO4·NaNO3·2H2O, NaCl+NaNO3+Na2SO4·MgSO4·4H2O+MgSO4·7H2O, NaCl+NaNO3+Mg(NO3)2·6H2O+MgSO4·7H2O, MgSO4·(1—6)H2O+Mg(NO3)2·6H2O+MgSO4·7H2O+NaCl, MgSO4·(1—6)H2O+NaCl +MgCl2·6H2O+Mg(NO3)2·6H2O. Application of these phase diagrams were discussed for industry.

Key words: Quinary system, Brine, Nitrate, Phase equilibrium

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