Thermodynamic equilibrium of the O2–ZnSO4–H2SO4–H2O system from 25 to 250°C

Liu, Haixia; Papangelakis, Vladimiros G.

doi:10.1016/j.fluid.2005.06.004

Cited by 22 publications

(13 citation statements)

References 28 publications

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“…However, log K sp becomes 0.7459 if extrapolated linearly below 100 °C from eq 7. This value seems to be more consistent with the log K sp of ZnSO 4 ·H 2 O (−1.24), which is valid from 50 to 250 °C, and that of FeSO 4 ·H 2 O (−0.91), which is valid from 10 to 90 °C. It is this consistency that is sought by the present approach.…”

Section: Resultssupporting

confidence: 76%

“…Such highly concentrated solutions are difficult to model thermodynamically due to their inherent complexity because of their multicomponent nature and a high degree of nonideality. Nevertheless, recent advances in the theory of concentrated multicomponent electrolyte solutions , allow chemical modeling of concentrated process solutions with a fair degree of accuracy. , The OLI software program provides a state-of-the-art thermodynamic framework for modeling complex aqueous equilibria over wide ranges of temperature (−50 to 300 °C), pressure (0−1500 bar), and concentration (0−30 m ). , OLI's mixed solvent electrolyte (MSE) model can be applied to aqueous and mixtures of aqueous and nonaqueous electrolyte systems. , …”

Section: Introductionmentioning

confidence: 99%

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Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Liu

Papangelakis

2005

Ind. Eng. Chem. Res.

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The existence of Pb(II) in nickel sulfide mineral feedstocks imposes a burden to nickel hydrometallurgy. To devise effective Pb(II) control strategies, the solubility of Pb(II) in mixed sulfate-chloride solutions needs to be known in the nickel industry. In this work, the solubility of Pb(II) and Ni(II) in a Pb-Na-Ni-SO 4 -Cl-H 2 O system was modeled with the mixed solvent electrolyte (MSE) model through commercial software OLI systems. The model parameters, including equilibrium constants of solids (PbCl 2 , PbSO 4 , NiSO 4 ‚nH 2 O, and NiCl 2 ‚nH 2 O) and MSE ion interaction parameters, were regressed from various types of equilibrium and thermophysical data such as solubility, heat capacity, vapor pressure, and mean activity coefficient. The obtained model parameters are capable of accurately representing experimental data in binary (PbCl 2 -H 2 O, PbSO 4 -H 2 O, NiSO 4 -H 2 O, and NiCl 2 -H 2 O) and ternary (PbCl 2 -HCl/NaCl-H 2 O, NiSO 4 -Na 2 SO 4 -H 2 O, and NiCl 2 -HCl-H 2 O) systems and give excellent predictions in multicomponent systems (NiCl 2 -NaCl-H 2 O, PbSO 4 -H 2 SO 4 -H 2 O, and PbSO 4 -H 2 SO 4 -HCl-H 2 O).

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Liu

Papangelakis

2005

Ind. Eng. Chem. Res.

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“…8, and method 3 from the experimental data and the activity coefficients of the components of the solutions. Method 2 is generally the first choice because the accuracy of K values is independent of the solubility data as well as the model used to describe the activity coefficients 18–21. Therefore, in this work, the values of K 1 and K 2 were determined by method 2.…”

Section: Resultsmentioning

confidence: 99%

Modeling solid–liquid equilibrium of NH₄Cl‐MgCl₂‐H₂O system and its application to recovery of NH₄Cl in MgO production

Wang

2011

AIChE Journal

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A new method to recover NH 4 Cl from NH 4 Cl-rich aqueous solutions generated in the magnesia (MgO) production is developed on the basis of modeling the solid-liquid equilibrium (SLE) for the NH 4 Cl-MgCl 2 -H 2 O system with the Pitzer model embedded in Aspen Plus TM platform. The SLE values for the ternary system were determined from 278.15 to 348.15 K. The new standard-state chemical potentials of NH 4 Cl and MgCl 2 Á6H 2 O were judicially obtained. The resulting equilibrium constants were used to determine new interaction parameters for the NH 4 Cl-H 2 O and MgCl 2 -H 2 O systems. These new parameters, together with the mixing parameters determined from correlating the experimental values, were used to correlate the equilibrium constant for NH 4 MgCl 3 Á6H 2 O, which plays a key role in NH 4 Cl recovery. The results could extend SLE calculation for the NH 4 Cl-MgCl 2 -H 2 O system from 278.15 to 388.15 K, satisfying the process identification and simulation requirement involved in the recovery process. The phase-equilibrium diagram generated by modeling was illustrated to identify the process alternatives for recovering NH 4 Cl. The resulting course to recover NH 4 Cl by three fractional crystallization operations was finally proved feasible.

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“…Liu and Papangelakis [4] used mixed solvent electrolyte (MSE) model [5] to study O2 -ZnSO4 -H2SO4 -H2O system from 25 to 250 °C. They used available solubility data and mean activity coeffients at 25°C to derive their model, and the accuracy of their model in predicting mean activity coefficients of solute species seems to be lacking, at least at low molalities and at 25 °C.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of the ZnSO4-H2SO4-H2O system

Vielma

Salminen

Lassi

2018

Calphad

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Internally consistent set of thermodynamic parameters was derived for the binary ZnSO4-H2O-system using the CALPHAD method. Available data on water activity, EMF measurements, solubility and heat of solution and dilution measurements was reviewed. Additional parameters for the ternary ZnSO4-H2SO4-H2O system were derived based on the available solubility and boiling point data. Solubility of zinc sulfate was predicted successfully under conditions relevant in hydrometallurgical processing of zinc, and even up to 15 mol/kg sulfuric acid solutions. Temperature dependent Pitzer parameters for the binary and ternary systems are reported.

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Thermodynamic equilibrium of the O2–ZnSO4–H2SO4–H2O system from 25 to 250°C

Cited by 22 publications

References 28 publications

Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Modeling solid–liquid equilibrium of NH₄Cl‐MgCl₂‐H₂O system and its application to recovery of NH₄Cl in MgO production

Thermodynamics of the ZnSO4-H2SO4-H2O system

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Thermodynamic equilibrium of the O2–ZnSO4–H2SO4–H2O system from 25 to 250°C

Cited by 22 publications

References 28 publications

Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Solubility of Pb(II) and Ni(II) in Mixed Sulfate−Chloride Solutions with the Mixed Solvent Electrolyte Model

Modeling solid–liquid equilibrium of NH4Cl‐MgCl2‐H2O system and its application to recovery of NH4Cl in MgO production

Thermodynamics of the ZnSO4-H2SO4-H2O system

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Modeling solid–liquid equilibrium of NH₄Cl‐MgCl₂‐H₂O system and its application to recovery of NH₄Cl in MgO production