Phase Equilibria for the Reciprocal Aqueous Quaternary System Li+, Rb+//Cl−, Borate–H2O at 323.2 K

Solid–Liquid Equilibria of the Quinary System Li+, K+, Mg2+//Cl–, B4O72––H2O at 323.2 K

“…−H 2 O, 10 Li + , Mg 2+ //Cl − − H 2 O, 11,12 Li + , K + //Cl − −H 2 O, 12 K + , Rb + //Cl − −H 2 O, 13 and K + , Mg 2+ //Cl − −H 2 O; 13 quaternary systems Li + , K + , Rb + // borate−H 2 O, 14 K + , Rb + //Cl − , borate−H 2 O, 15 Li + , Rb + //Cl − , borate−H 2 O, 16 and Li + , Mg 2+ //Cl − , borate−H 2 O; 17 quinary systems Li + , K + , Rb + , Mg 2+ //borate−H 2 O, 18, 19 Li + , K + , Rb + , Mg 2+ //Cl − −H 2 O, 20 Li + , K + , Rb + //Cl − , borate−H 2 O, 21 and Li + , Na + , Mg 2+ //Cl − , B 4 O 7 2− −H 2 O. 22 The results of studies show that lithium carnallite LiCl•MgCl 2 •7H 2 O is easily produced in the chloride coexistence system of lithium and magnesium, carnallite KCl•MgCl 2 •6H 2 O is formed in the coexistence system of potassium and magnesium, rubidium carnallite RbCl•MgCl 2 •6H 2 O is found in the chloride type system containing magnesium and rubidium, and solid solution [(K, Rb)Cl] is formed in the coexistence system of potassium and rubidium.…”

“…According to the composition characteristics of potassium-rich brine in Sichuan Basin (especially Pingluoba brine), it can be simplified as the system Li + , Na + , K + , Rb + , Mg 2+ //Cl – , B 4 O 7 2– –H 2 O. For the system, there have been some studies on the phase equilibria of its subsystems, − for example, ternary systems Li + //BO 2 – , B 4 O 7 2– –H 2 O, Li + , Mg 2+ //Cl – –H 2 O, , Li + , K + //Cl – –H 2 O, K + , Rb + //Cl – –H 2 O, and K + , Mg 2+ //Cl – –H 2 O; quaternary systems Li + , K + , Rb + //borate–H 2 O, K + , Rb + //Cl – , borate–H 2 O, Li + , Rb + //Cl – , borate–H 2 O, and Li + , Mg 2+ //Cl – , borate–H 2 O; quinary systems Li + , K + , Rb + , Mg 2+ //borate–H 2 O, , Li + , K + , Rb + , Mg 2+ //Cl – –H 2 O, Li + , K + , Rb + //Cl – , borate–H 2 O, and Li + , Na + , Mg 2+ //Cl – , B 4 O 7 2– –H 2 O . The results of studies show that lithium carnallite LiCl·MgCl 2 ·7H 2 O is easily produced in the chloride coexistence system of lithium and magnesium, carnallite KCl·MgCl 2 ·6H 2 O is formed in the coexistence system of potassium and magnesium, rubidium carnallite RbCl·MgCl 2 ·6H 2 O is found in the chloride type system containing magnesium and rubidium, and solid solution [(K, Rb)­Cl] is formed in the coexistence system of potassium and rubidium.…”

Solid–Liquid Equilibria (SLE) of the Quinary Reciprocal Aqueous System Li+, K+, Rb+//Cl–, Borate-H2O at 323.2 K

“…Accordingly, a series of phase equilibria studies have been done aimed at different types of brine. − As for the main components of the Pingluo brine, they can be simplified as the Li + , Na + , K + , Rb + , Mg 2+ //Cl – , Borate-H 2 O system. Therefore, to understand the thermodynamic behaviors of the complex system, phase diagrams of some subsystems have been measured. − For the borate-containing system, the crystalline form of boron appears in many polymeric forms such as BO 2 – , B­(OH) 4 – , B­(OH) 3 , B 4 O 7 2– , and B 5 O 8 – when the coexisting ions and temperature change. , As for the quinary system Li + , K + , Rb + //Cl – , Borate-H 2 O at 323.2 K, the corresponding nine ternary subsystems and five quaternary subsystems at 323.2 K have been studied. − The research results show that two boron species, B 4 O 7 2– and B 5 O 8 – , were found in the borate system containing potassium/lithium and rubidium; the solid solution [(K, Rb)­Cl] was formed in the chloride type system containing potassium and rubidium; and the rubidium carnallite RbCl·MgCl 2 ·6H 2 O was found in the chloride type system containing magnesium and rubidium. Commonly, the coexisting ions in the solution have a direct effect on the crystallization form of salts.…”

Solid–Liquid Phase Equilibria of the Quaternary system Li2SO4–LiBO2–Li2B4O7–H2O and the Ternary Subsystem LiBO2–Li2B4O7–H2O at T = 288.15 K and p = 0.1 MPa

“…In recent years, a large number of studies have been carried out on the phase equilibria of brine systems containing different borates, such as the systems Li + , K + , Mg 2+ //Cl – , B 4 O 7 2– –H 2 O at 273.15 K, Li + , K + , Rb + , Mg 2+ //B 4 O 7 2– –H 2 O at 323.15 K, and NaCl–NaBO 2 –Na 2 B 4 O 7 –H 2 O at 298.15 K . The main brine systems containing borates reported in the literature were also summarized in the literature. , However, the phase equilibria in the system Li 2 SO 4 –LiBO 2 –Li 2 B 4 O 7 –H 2 O, which is the important system containing two lithium borates, were not reported in the literature. The phase diagrams of its subsystems Li 2 SO 4 –LiBO 2 –H 2 O at 288.15, 298.15, and 323.15 K, − Li 2 SO 4 –Li 2 B 4 O 7 –H 2 O at 273.15, 288.15, and 323.15 K, − and LiBO 2 –Li 2 B 4 O 7 –H 2 O at 298.15 and 323.15 K were reported.…”