Thermodynamic Modeling of Aqueous Aluminum Chemistry and Solid-Liquid Equilibria to High Solution Concentration and Temperature. I. The Acidic H-Al-Na-K-Cl-H2O System from 0 to 100 °C

Thermodynamic model for solution behavior and solid-liquid equilibrium in Na-Al(III)-Fe(III)-Cr(III)-Cl-H2O system at 25°C

“…Christov et al [10] develop a temperature variable ((0 to 100) o C) model for H-Na-K-Al-Cl-H2O system. The T-variation model for Na-Al-Cl-H2O sub-system have been costructed without using solubility data in this ternary.…”

“…Note that [28] determine the constant θ(Na,Al) value using their own extremely low gibbsite solubility data in sodium chloride media. Christov et al [10] evaluate T-variation ψ(Na,Al,Cl) parameter by ploting polythermal diagram for Na-K-Al-Cl-H2O system. After that, [11,12] used the mixing θ(Na,Al) and ψ(Na,Al,Cl) parameterization establishe in [10] to develop a T-variation model for gibbsite and boehmite solubility in NasCl solutions.…”

“…Christov et al [10] evaluate T-variation ψ(Na,Al,Cl) parameter by ploting polythermal diagram for Na-K-Al-Cl-H2O system. After that, [11,12] used the mixing θ(Na,Al) and ψ(Na,Al,Cl) parameterization establishe in [10] to develop a T-variation model for gibbsite and boehmite solubility in NasCl solutions. As a first step in a new Na-Al-Cl-H2O model development we test the parameterization of [10] using available solubility data.…”

“…The specific interaction approach for describing electrolyte solutions to high concentration introduced by Pitzer [1,2] represents a significant advance in physical chemistry that has facilitated the construction of accurate thermodynamic models. It was showed that the Pitzer approach could be expanded to accurately calculate solubilities in complex brines and to predict the behavior of natural fluids at standard temeperature [3][4][5], as well as at wide range of temperatures from 0 o to 300 o C [6][7][8][9] , and from extremely low [10][11][12] to very high concentration of solutions [8,9,35]. However, the existing Pitzer's databases have different limitations as the number of implemented solution species and precipitating solids, the temperature and concentration ranges of application.…”

“…This is why a permanent updating work must be done in order to increase their applicability, and consequently the quality of predicted results. This paper continues our series () concerning parameterization of Pitzer approach based comprehensive models which can assist in the development of a complex thermodynamic database that can accurately predict the chemical behavior of aluminium Al 3+ [10][11][12][13][14][15][16][17], chromate (CrO4) [18], dichromate (Cr2O7) [19,20], and Iron (as Fe 2+ [21], and Fe 3+ [21,35] solution species and minerals in a sea-type natural fluid systems. The main objective of this study is the development of a high accuracy thermodynamic model for solution behavior, and highly soluble M(III)Cl3(s) (M= Al, Fe, Cr) minerals solubility in Na-Al(III)-Cr(III)-Fe(III)-Cl-H2O system at 25°C.…”