Measurements and calculations of solid-liquid equilibria in two quaternary systems: LiCl–NaCl–SrCl2–H2O and LiCl–KCl–SrCl2–H2O at 298 K

Studies on Phase Equilibria in Ternary System LiCl–SrCl2–H2O at 288.15 K and Quaternary System LiCl–KCl–SrCl2–H2O at 288.15 and 323.15 K

“…For example, Sherali Tursunbadalov used the translation method to study the phase equilibria of the quinary system LiCl–NaCl–KCl–SrCl 2 –H 2 O at 298.15 K; Meng et al reported the strontium-containing system LiCl–NaCl–KCl–SrCl 2 –H 2 O at 298.15 K and some of the subsystems (273.15, 288.15 K). − According to relevant phase equilibrium studies, when lithium chloride is saturated, the solubilities of strontium salts are very small, indicating that lithium chloride has a strong salting-out effect on strontium chloride. On the basis of previous studies, our research team has carried out some phase equilibrium studies of ternary, quaternary, and quinary systems containing lithium, potassium, and strontium in the underground brines of the Sichuan Basin. − For the ternary system LiCl–SrCl 2 –H 2 O, many scholars have carried out stable phase equilibrium studies, Wang et al and Yang et al studied the phase equilibria at 273.15 and 288 K; , the results show that when temperature T ≤ 288.15.15 K, lithium chloride can crystallize from saturated solution stably in the form of LiCl·2H 2 O. Nie and Li et al also measured the phase equilibria of the ternary system at 298.15 and 308.15 K, , and their results show lithium chloride can crystallize from saturated solution of LiCl·H 2 O at 308.15 K, and SrCl 2 ·2H 2 O and SrCl 2 ·6H 2 O can exist simultaneously in the system at T ≤ 308.15 K. Li et al reported the phase equilibria of the LiCl–SrCl 2 –H 2 O system at 323.15 and 348.15 K, and their results show that SrCl 2 ·6H 2 O, SrCl 2 ·2H 2 O, and SrCl 2 ·H 2 O appeared simultaneously in the ternary system at 323.15 K, and only SrCl 2 ·2H 2 O and SrCl 2 ·H 2 O crystallize at 348.15 K. Assarsson studied the coexistence system of magnesium and strontium, and the results show that SrCl 2 ·6H 2 O dehydrates to SrCl 2 ·2H 2 O at 19.4 °C; when lithium chloride and strontium chloride coexisted in saturated solution, SrCl 2 ·6H 2 O dehydrates and forms SrCl 2 ·2H 2 O at 273.15 K . It can be concluded that the dehydration of strontium chloride hydrate is affected not only by temperature conditions, but also by coexisting ions in saturated solution.…”

Phase Equilibria in the Quaternary System LiCl–NaCl–SrCl2–H2O at 273 and 323 K

“…Some phase equilibria containing lithium chloride or strontium chloride have been reported, such as the following systems, the ternary system LiCl–NaCl–H 2 O at 273, 288, 308, 323, 333, and 348 K, − LiCl–KCl–H 2 O at 273, 288, 308, 323, and 333 K, , LiCl–SrCl 2 –H 2 O at 273, 308, and 323 K, − NaCl–KCl–H 2 O at 293–360 K, and NaCl–SrCl 2 –H 2 O at 273, 288, 323, 333, and 373 K, − as well as the quaternary systems NaCl–KCl–SrCl 2 –H 2 O at 323, 348, and 373 K, − and LiCl–NaCl–SrCl 2 –H 2 O at 308, 288, and 298 K, ,, and the multicomponent system LiCl–NaCl–KCl–SrCl 2 –H 2 O at 298 K . Our research group has been committed to the study of the phase equilibria of the water–salt system.…”

“…Some of the ternary, quaternary, and quinary subsystems of the water–salt system Li + , Na + , K + //CO 3 2– , SO 4 2– , B 4 O 7 2– –H 2 O at 273, 288, 298, 323, and 373 K − are reported. In addition, we also added calculations to verify the experimental data, such as the calculation of some ternary and quaternary subsystems of the quinary systems LiCl–NaCl–KCl–SrCl 2 –H 2 O and NaBr–KCl–MgBr 2 –SrBr 2 –H 2 O. ,, …”

“…Secondly, the study of multi-temperature phase balance can find and excavate some or all of the mother liquor in the chemical production process to recycle rationally, improve the recovery rate of active ingredients in the mother liquor, and achieve the purpose of saving resources, energy saving, and emission reduction. For experimental and theoretical research of water–salt systems including lithium chloride, sodium chloride, and strontium chloride, only the quaternary system LiCl–NaCl–SrCl 2 –H 2 O at 308, 288 and 298 K was studied. ,, In this work, the solubility data were obtained, water-content diagrams were drawn, and the X-ray powder diffraction (XRD) patterns were gained at some invariant points of the quaternary system LiCl–NaCl–SrCl 2 –H 2 O at 273 and 323 K.…”

“…"salt lakes lithium" reserves in China include about 19.82 million tons of lithium chloride in Qinghai salt lakes, and salt lakes in Tibet have identified more than 17.4 million tons. 7,8 Some phase equilibria containing lithium chloride or strontium chloride have been reported, such as the following systems, the ternary system LiCl−NaCl−H 2 O at 273, 288, 308, 323, 333, and 348 K, 9−12 LiCl−KCl−H 2 O at 273, 288, 308, 323, and 333 K, 12,13 LiCl−SrCl 2 −H 2 O at 273, 308, and 323 K, 14−16 NaCl−KCl−H 2 O at 293−360 K, 17 and NaCl−SrCl 2 −H 2 O at 273, 288, 323, 333, and 373 K, 18−21 as well as the quaternary systems NaCl−KCl−SrCl 2 −H 2 O at 323, 348, and 373 K, 21−23 and LiCl−NaCl−SrCl 2 −H 2 O at 308, 288, and 298 K, 18,24,25 and the multicomponent system LiCl−NaCl−KCl−SrCl 2 −H 2 O at 298 K. 26 Our research group has been committed to the study of the phase equilibria of the water−salt system. Some of the ternary, quaternary, and quinary subsystems of the water−salt system Li + , Na + , K + //CO 3 2− , SO The study of multi-temperature phase equilibria can provide theoretical support for comprehensive and efficient utilization of salt lake brine resources.…”