【摘要】 基于盐的溶解平衡条件及稳定共饱点的判别原理 ,用 Pitzer模型的 HW公式对四元体系 Na+ ,K+ /Cl- ,HCO-3-H2 O和 Na+ ,K+ /SO2 -4,HCO-3-H2 O在 2 98K的溶解度进行了预测 ,并绘出了这两个体系的相图 :前者有两个共饱点 ,Na Cl,Na HCO3,KCl和 KHCO3四个相区 ;后者有三个共饱点 ,Na2 SO4 · 1 0 H2 O,K3Na(SO4 ) 2 ,K2 SO4 ,Na HCO3和 KHCO3五个相区更多还原

【Abstract】 Based on the condition of dissolution equilibria of salts and the discrimination of stable invariant points, the solubilities and phase diagrams of the two quarternary systems Na +,K +/Cl -,HCO - 3 H 2O and Na +,K +/SO 2- 4,HCO - 3 H 2O at 298 K were predicted by using Harvie Weare equation (1980). Two invariant points and four regions of crystallization: NaCl, NaHCO 3, KCl and KHCO 3 are found in the phase diagram of the first system, and three invariant points and five regions of crystallization: Na 2SO 4·10H 2O, K 3Na(SO 4) 2, K 2SO 4, NaHCO 3 and KHCO 3 in that of the second system. Consistent with the solubilities of the ternary subsystems in literatures, the results are of practical significance in studying the formation and evolution of the salt deposit in alkaline salt lakes and designing salt chemical production.更多还原