Abstract
The solubilities; concentration of four boron species B(OH)3, B(OH)4−, B3O3(OH)4−, and B4O5(OH)42−; and H+ (OH–) in the system Na2O–B2O3–H2O were calculated with the Pitzer model. The boron species B5O6(OH)4− was not considered in the model calculation. The calculated solubility and pH data are in accordance with the experimental results. The Pitzer model can be used to describe the experimental values. The distributions of the four boron species in the solution were obtained. The mole fractions of the four boron species are mainly affected by the ratio of B2O3 and Na2O in the solution. The dominant boron species in the solution saturated with different salts vary greatly. The results can supply a theoretical reference for sodium borate separation from brine.
Highlights
Introduction e Qaidam Basin inQinghai is the gathering place of salt lake resources in China [1]
E Pitzer parameters and μΘ/RT of different boron species in the system Na2O-B2O3-H2O at 298.15 K were obtained from Felmy and Weare [20]. e lacking Pitzer mixing ion-interaction parameters for boron ions are considered as zero
B(OH)4– is the dominant boron species in the solution saturated with NaB(OH)4·2H2O. e boron species are very different in the solution saturated with Na2B4O5(OH)4·3H2O
Summary
Introduction e Qaidam Basin inQinghai is the gathering place of salt lake resources in China [1]. E Pitzer parameters and μΘ/RT of different boron species in the system Na2O-B2O3-H2O at 298.15 K were obtained from Felmy and Weare [20]. In the system Na2O-B2O3H2O, the concentration of B5O6(OH)4− may be not neglected when the solution is saturated with NaB5O6(OH)4·3H2O.
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