Measurements and predictions of mineral solubilities in the quaternary systems NaCl + KCl + SrCl2 + H2O, NaCl + MgCl2 + SrCl2 + H2O and KCl + MgCl2 + SrCl2 + H2O at 308 K

Gao, Yun‐Yun; Sang, Shi‐Hua; Liu, Zhuo-Min; Qu, Shanshan; Yang, Wei

doi:10.1016/j.fluid.2022.113505

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…Tursunbadalov , constructed a total phase equilibria diagram for the Na, K, Mg//Cl, SO 4 –H 2 O seawater system at 0 and 25 °C. Deng investigated simulation calculations on metastable phase equilibria in the aqueous ternary systems NaCl–MgCl 2 –H 2 O and KCl–MgCl 2 –H 2 O at 308.15 K. Yang researched on the phase diagrams and Pitzer model representations for the system KCl + MgCl 2 + H 2 O at 323.15 and 348.15 K. Cheng studied the metastable phase equilibrium of the quaternary system K + , Mg 2+ , Ca 2+ //Cl – –H 2 O at 298.2 K. Xu investigated metastable phase equilibria in the ternary systems KCl–MgCl 2 –H 2 O and MgB 4 O 7 –MgCl 2 –H 2 O at 273 K. Gao described the measurements and predictions for mineral solubilities in the quaternary systems NaCl + KCl + SrCl 2 + H 2 O, NaCl + MgCl 2 + SrCl 2 + H 2 O, and KCl + MgCl 2 + SrCl 2 + H 2 O and subsystem MgCl 2 + SrCl 2 + H 2 O at 308 K. Sang studied the solid–liquid-phase equilibrium of quaternary system Mg 2+ , K + //Cl – , B 4 O 7 2– –H 2 O at 288 K. Guo studied the phase equilibria of the quaternary system K + , Mg 2+ //Cl – , borate–H 2 O at 298 K. Li , investigated the phase equilibrium data of the quaternary system NH 4 Cl–MgCl 2 –NaCl–H 2 O at 348.15 K and quaternary system K + , NH 4 + //Cl – , SO 4 2– –H 2 O at 273.15 K for the chloride-free potash production by carnallite. Li drew a conclusion that controlling the sodium chloride content in K-carnallite ore can increase the yield of potassium chloride and also economize a lot of water in the process.…”

Section: Introductionmentioning

confidence: 99%

Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

et al. 2023

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The solid–liquid-phase equilibria of quaternary system K+, Mg2+, Na+//Cl––H2O and its three ternary subsystems K+, Mg2+//Cl––H2O; Mg2+, Na+//Cl––H2O; and K+, Na+//Cl––H2O at 278.15 and 288.15 K were studied by an isothermal solution equilibrium method. The quaternary system K+, Mg2+, Na+//Cl––H2O includes two invariant points, five univariant curves, and four crystallization regions. The double salt KCl·MgCl2·6H2O is found in the quaternary system but no solid solution. Based on the experimental results and the multitemperature comparison, the order of the solubilities of the single salts is KCl < NaCl < MgCl2 within a certain temperature range. As the temperature decreases from 288.15 to 278.15 K, all of the solubilities of KCl, MgCl2·6H2O, and NaCl decrease. The dissolution of MgCl2 and NaCl can affect the crystallization of KCl. From a thermodynamic point of view, low temperatures are beneficial to the crystallization of potassium chloride from the system. Therefore, it is important to control the low operating temperature, low concentration of NaCl, and high concentration of MgCl2 in the production process. The data obtained in this work have important implications for the design and optimization of the production process of potassium chloride from K-carnallite in low-temperature conditions.

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Section: Introductionmentioning

confidence: 99%

Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

et al. 2023

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Measurements and predictions of phase equilibria in quinary system NaCl + KCl + MgCl₂ + SrCl₂ + H₂O (saturated with NaCl) at 308.2 K

Sang

Yang

Feng

et al. 2023

Asia-Pacific J Chem Eng

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Sichuan Basin of China is a typical underground brine enrichment area. In order to develop and utilize the brine resource, it is necessary to study the phase equilibria and phase diagram of brine systems. In this work, the phase equilibria of the quinary system NaCl + KCl + MgCl2 + SrCl2 + H2O (saturated with NaCl) at 308.2 K of the underground brines in Sichuan Basin are measured experimentally by isothermal dissolution equilibrium method. The phase diagram, water content diagram, and sodium chloride content change diagram of the quinary system with NaCl saturated are also drawn, respectively. The results show that the phase diagram of the quinary system contains three invariant points, seven isothermal solubility curves, and five solid crystal zones at 308.2 K. In the phase diagram, the KCl crystallization area is the largest, followed by SrCl2·6H2O, KCl·MgCl2·6H2O, and SrCl2·2H2O, while MgCl2·6H2O has the smallest crystallization area. Magnesium chloride in the quinary system has the largest solubility and has strong salting‐out effect on other salts. Furthermore, the unreported mixed ion interaction parameters θMg, Sr and ΨMg, Sr, Cl of Pitzer model are fitted, respectively. Consequently, the solubilities of the quinary system NaCl + KCl + MgCl2 + SrCl2 + H2O at 308.2 K are predicted using the Pitzer model, and the calculated phase diagram at 308.2 K is also plotted in detail. The predicted solubilities of the quinary system were in good agreement with the experimental solubilities. Finally, the study on the phase equilibrium of the quinary system can provide phase equilibrium data for the development and utilization of liquid mineral resources.

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Measurements and Calculations of Phase Equilibria in the Quaternary Systems NaCl–MgCl₂–SrCl₂–H₂O and KCl–MgCl₂–SrCl₂–H₂O at 298.2 K

Zheng,

Sang,

Guo

et al. 2024

J. Chem. Eng. Data

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Underground brines are important liquid mineral resources, and the phase equilibria of the salt−water system on underground brines are conducive to the development and utilization of the rich mineral resources in brines. The phase equilibrium studies of the quaternary systems NaCl−MgCl 2 − SrCl 2 −H 2 O and KCl−MgCl 2 −SrCl 2 −H 2 O at 298.2 K were carried out using the isothermal dissolution equilibrium method. The solubility of each salt in the equilibrium liquid phase was measured, and the corresponding equilibrium solid phases were identified by XRD. The results showed that the quaternary system NaCl− MgCl 2 −SrCl 2 −H 2 O contained five isothermal solubility univariate curves, two invariant points, and four equilibrium solid-phase crystallization regions (SrCl 2 •2H 2 O, SrCl 2 •6H 2 O, MgCl 2 •6H 2 O, and NaCl). The phase diagram in the quaternary system KCl− MgCl 2 −SrCl 2 −H 2 O has three invariant points, seven isothermal solubility univariate curves, and five equilibrium solid-phase crystallization regions (SrCl 2 •6H 2 O, SrCl 2 •2H 2 O, MgCl 2 •6H 2 O, KCl•MgCl 2 •6H 2 O, and KCl). The phase equilibrium relationships of these two quaternary systems at different temperatures were also analyzed detailedly. Furthermore, the Pitzer model was used to calculate the solubilities of salts in the above systems. The calculations and experimental results are compared, and the calculated phase diagram agrees well with the experimental phase diagram.

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Measurements and predictions of mineral solubilities in the quaternary systems NaCl + KCl + SrCl2 + H2O, NaCl + MgCl2 + SrCl2 + H2O and KCl + MgCl2 + SrCl2 + H2O at 308 K

Cited by 3 publications

References 26 publications

Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

Measurements and predictions of phase equilibria in quinary system NaCl + KCl + MgCl₂ + SrCl₂ + H₂O (saturated with NaCl) at 308.2 K

Measurements and Calculations of Phase Equilibria in the Quaternary Systems NaCl–MgCl₂–SrCl₂–H₂O and KCl–MgCl₂–SrCl₂–H₂O at 298.2 K

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Measurements and predictions of mineral solubilities in the quaternary systems NaCl + KCl + SrCl2 + H2O, NaCl + MgCl2 + SrCl2 + H2O and KCl + MgCl2 + SrCl2 + H2O at 308 K

Cited by 3 publications

References 26 publications

Solid–Liquid-Phase Equilibria of Quaternary System K+, Mg2+, Na+//Cl––H2O at 278.15 and 288.15 K

Solid–Liquid-Phase Equilibria of Quaternary System K+, Mg2+, Na+//Cl––H2O at 278.15 and 288.15 K

Measurements and predictions of phase equilibria in quinary system NaCl + KCl + MgCl2 + SrCl2 + H2O (saturated with NaCl) at 308.2 K

Measurements and Calculations of Phase Equilibria in the Quaternary Systems NaCl–MgCl2–SrCl2–H2O and KCl–MgCl2–SrCl2–H2O at 298.2 K

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Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

Solid–Liquid-Phase Equilibria of Quaternary System K⁺, Mg²⁺, Na⁺//Cl^––H₂O at 278.15 and 288.15 K

Measurements and predictions of phase equilibria in quinary system NaCl + KCl + MgCl₂ + SrCl₂ + H₂O (saturated with NaCl) at 308.2 K

Measurements and Calculations of Phase Equilibria in the Quaternary Systems NaCl–MgCl₂–SrCl₂–H₂O and KCl–MgCl₂–SrCl₂–H₂O at 298.2 K