Stable Phase Diagram of the Quaternary Water–Salt System Li+, Na+, Rb+//SO42–·H2O at 298.2 and 323.2 K (P = 94.5 kPa),Journal of Chemical & Engineering Data

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Stable Phase Diagram of the Quaternary Water–Salt System Li+, Na+, Rb+//SO42–·H2O at 298.2 and 323.2 K (P = 94.5 kPa)
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-03-24 , DOI: 10.1021/acs.jced.0c01019
Wannian Ying ₁ , Ying Zeng _{1,

2} , Xinxin Lv ₁ , Hanlin Tong ₁ , Wenzhang Zuo ₁ , Pan Xu ₁ , Xudong Yu _{1,

2}

Affiliation

The stable phase equilibrium of the quaternary system Li⁺, Na⁺, Rb⁺// SO₄^2– – H₂O at T = 298.2 and 323.2 K (P = 94.5 kPa) was studied by an isothermal dissolution equilibrium method. The solubilities, density, and refractive index of equilibrated solution were determined. It is found that the projected phase diagrams of the quaternary system at 298.2 and 323.2 K (P = 94.5 kPa) both contain four invariant points, nine univariant curves, and six crystallization regions. By comparing the phase diagrams at 298.2 and 323.2 K, it is found that at 298.2 K, the region of single salt Rb₂SO₄ is the largest one and that of Li₂SO₄·H₂O is the smallest one. At T = 323.2 K, the single salt Na₂SO₄·10H₂O transforms into Na₂SO₄ and the lithium sodium double salt is transformed from 3Na₂SO₄·Li₂SO₄·12H₂O to Li₂SO₄·Na₂SO₄. Meanwhile, the maximum phase region shifts from Rb₂SO₄ to Li₂SO₄·Na₂SO₄. This indicates that with the rise of temperature, the solubilities of Rb₂SO₄ and Li₂SO₄·Na₂SO₄ changed significantly and the lithium sodium double salt will be crystallized out from the system in the form of Li₂SO₄·Na₂SO₄, with a higher lithium sodium ratio. In other words, it is unfavorable to extract rubidium sulfate from sulfate brine, while it has obvious promoting effects on extracting lithium sulfate.

中文翻译：

四元水盐系统Li ⁺，Na ⁺，Rb ⁺ // SO ₄^2– ·H ₂ O在298.2和323.2 K时的稳定相图（P = 94.5 kPa）

采用等温溶解平衡法研究了四元体系Li ⁺，Na ⁺，Rb ⁺ // SO ₄^2- – H ₂ O在T = 298.2和323.2 K（P = 94.5 kPa）时的稳定相平衡。测定平衡溶液的溶解度，密度和折射率。发现在298.2和323.2 K（P = 94.5 kPa）处的四元体系投影相图都包含四个不变点，九个单变量曲线和六个结晶区域。通过比较在298.2 K和323.2 K处的相图，可以发现在298.2 K处，单盐Rb ₂ SO的区域₄是最大的，Li ₂ SO ₄ ·H ₂ O是最小的。在T = 323.2 K时，单盐Na ₂ SO ₄ ·10H ₂ O转化为Na ₂ SO ₄，锂钠复盐从3Na ₂ SO ₄ ·Li ₂ SO ₄ ·12H ₂ O转化为Li ₂ SO _4。 ·Na ₂ SO ₄。同时，最大相区从Rb ₂ SO ₄变为Li ₂SO ₄ ·Na ₂ SO ₄。这表明随着温度的升高，Rb ₂ SO ₄和Li ₂ SO ₄ ·Na ₂ SO ₄的溶解度发生明显变化，锂钠复盐将以Li ₂ SO ₄ ·的形式从体系中结晶出来。Na ₂ SO ₄，具有较高的锂钠比。换句话说，不利的是从硫酸盐盐水中提取硫酸rub，同时对提取硫酸锂具有明显的促进作用。

更新日期：2021-04-08

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