Solid–Liquid Phase Equilibria in the Ternary Systems (LiBO2 + NaBO2 + H2O) and (LiBO2 + KBO2 + H2O) at 288.15 K and 0.1 MPa

Speciation and Phase Equilibria of Aqueous Boric Acid and Alkali Metal Borates from Ambient to Hydrothermal Conditions: A Comprehensive Thermodynamic Model

“…Solubility in the KBO 2 + H 2 O system as a function of temperature. Symbols are literature data; ,,, lines are calculated from the MSE model.…”

“…The metal borate systems are generally denoted by B 2 O 3 + M 2 O + H 2 O (M = Na, Li, K), which encompasses binary systems of alkali metal borates with different ratios of B:M, e.g., LiBO 2 + H 2 O, Li 2 B 4 O 7 + H 2 O, and LiB 5 O 8 + H 2 O, where B:Li are 1, 2, and 5, respectively. Depending on the temperature and ratio of B:M in the mixtures, multiple solid phases have been experimentally identified under varying conditions for each of the alkali metal borate systems studied here. ,,,− ,,,,,, The inclusion of solid phases in the model requires a detailed analysis of reported experimental solubility data from various sources. The solid phases included in the model are listed in Table .…”

“…The new experimental data, including the high-temperature speciation results from conductivity and Raman spectroscopic studies and solubility data for the Li and Na borates reported after the previous model was published, have provided more detailed and accurate knowledge of the chemistry and chemical speciation of the boric acid and alkali metal borate systems. Additional experimental data (solubility, isopiestic, pH, and ion-pair formation constants) from literature sources for the potassium borate system, ,,,− ,− over a wide temperature range to 623 K and B:K ratio of 0 ∼ ∞ to the solid saturation, provide the foundation to extend the thermodynamic model to a broader application range where potassium and boron are both important components. Based on these data and the data used in the previous model for boric acid, lithium borate, and sodium borate, a revised thermodynamic model has been constructed and extended to optimize the predictions of both phase equilibria and chemical speciation in these systems.…”

“…from natural resources. These include extensive solubility, speciation (pH and Raman spectroscopic), and calorimetric measurements. − All of these quantitative results are valuable sources of information that provide insights into the complex chemistry of aqueous boric acid and borate solutions and are an excellent foundation for the development of a more robust and reliable thermodynamic model for these systems. These data provide additional opportunities for testing and validating the model.…”

Solid–Liquid Phase Equilibria of the Ternary System (KBO2 + K2SO4 + H2O) at 288.15, 308.15 K, and 0.1 MPa

“…In order to evaluate and test the reliability of the experimental method in this work, the results for the solubilities in the binary subsystems (KBO 2 + H 2 O) and (K 2 SO 4 + H 2 O) at 288.15 and 308.15 K were compared with those in the literature, − and the results are summarized in Table . The results show that the experimental results in this work agree well with previous reports, demonstrating that our testing procedure and results are rational and reliable.…”