论文部分内容阅读
研究得出 (Na+ ,K+ ,Mg2 +∥ Cl-,SO2 -4 -H2 O)五元体系 3 5℃时的介稳溶解度数据 ,绘制了该体系 3 5℃的介稳相图 ,共有 9个为氯化钠所饱和的结晶区域 :氯化钾、钾芒硝 (3 K2 SO4 · Na2 SO4 )、钾镁矾 (K2 SO4· Mg SO4 · 4 H2 O)、钾盐镁矾 (KCl· Mg SO4 · 2 .75H2 O)、光卤石 (KCl· Mg Cl2 · 6H2 O)、白钠镁矾 (Na2 SO4· Mg SO4 · 4 H2 O)、硫酸钠、六水硫酸镁 (Mg SO4 · 6H2 O)和水氯镁石 (Mg Cl2 · 6H2 O) .所得 3 5℃介稳相图与 Van t Hoff2 5℃稳定相图比较有较大区别 :软钾镁矾 (K2 SO4 · Mg SO4 · 6H2 O)、七水硫酸镁、五水硫酸镁及四水硫酸镁结晶区域消失 ,钾镁矾和钾盐镁矾结晶区域显著扩大 .所得 3 5℃介稳相图与 2 5℃介稳相图区别很大 :软钾镁矾和七水硫酸镁结晶区域消失 ,同时出现了钾镁矾和钾盐镁矾的结晶区域 .在该五元体系 3 5℃介稳相平衡研究中发现析出的是钾盐镁矾的低水化合物 (KCl·Mg SO4 · 2 .75H2 O)
Metastable solubility data were obtained at 35 ℃ for the (Na +, K +, Mg2 + ∥Cl-, SO2-4 -H2O) five-element system. The metastable phase diagram of the system was obtained at 35 ℃. A total of nine The crystallization zone saturated with sodium chloride is potassium chloride, kesterite (3 K2 SO4 Na2 SO4), K2 SO4 MgSO4 A4 H2 O, KCl MgSO4 2 .75H 2 O), carnallite (KCl · MgCl 2 · 6H 2 O), sodium white sulfate (MgSO 4 · 4H 2 O), sodium sulfate, magnesium sulfate hexahydrate Chromite (Mg Cl2 · 6H2 O). The obtained stable phase diagram at 35 ℃ is quite different from the stable phase diagram at Van T Hoff2 5 ℃: K 2 SO 4 .Mg SO 4 .6H 2 O, The crystallization zone of magnesium sulfate heptahydrate, magnesium sulfate pentahydrate and magnesium sulfate tetrahydrate disappeared, and the crystallization zone of alum-alum and potassium-potassium magnesia expanded significantly.The obtained stable phase diagram at 35 ℃ was very different from the stationary phase diagram at 25 ℃ : The crystallization zone of soft magnesia and heptahydrate magnesium sulfate disappeared, and the crystallization zone of magnesia and potassium alum was appeared at the same time.It was found in the study of metastable phase equilibrium at 35 ℃ of the quaternary system that potassium magnesium Alum low water compounds (KCl · Mg SO4 · 2.75H2O)