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

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.

Liquid-soid Phase Equilibrium for the Quinary system Na+,Mg2+//Cl-,SO2-4,NO-3,H2O Saturated with NaCl at 298.16 K

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.