Thermodynamic modelling of aqueous Fe(II) sulfate solutions

被引：25

作者：

Kobylin, P. M. ^{[1
]}

Sippola, H. ^{[1
,2
]}

Taskinen, P. A. ^{[1
]}

机构：

[1] Aalto Univ, Sch Chem Technol, Dept Mat Sci & Engn Met Thermodynam & Modelling, FI-00076 Espoo, Aalto, Finland

[2] FCG Finnish Consulting Grp Oy, FI-00601 Helsinki, Finland

来源：

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY | 2011年 / 35卷 / 04期

关键词：

Pitzer model; Ferrous sulfate; Ferrous sulfate hydrates; Solubility; Activity; CALPHAD method; OSMOTIC COEFFICIENTS; FERROUS SULFATE; HIGH-PRESSURES; DISSOCIATION PRESSURES; THEORETICAL PREDICTION; MINERAL SOLUBILITIES; POTASSIUM-SULFATE; ALUMINUM SULFATE; IRON(II) SULFATE; AMMONIUM-SULFATE;

D O I：

10.1016/j.calphad.2011.08.005

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The H(2)O-FeSO(4) system has been modelled using the Pitzer activity coefficient approach over a temperature interval of -2-220 degrees C and in concentrations from pure water to the solubility limit of ferrous sulfate hydrates, the maximum FeSO(4) molality being 3.58 mol/kg at the FeSO(4)center dot 7H(2)O(s) to FeSO(4)center dot H(2)O(s) transition temperature of 56.5 degrees C. The thermodynamic properties of FeSO(4) hydrates were refined and FeSO(4)center dot 4H(2)O(s) was found to be a metastable phase in the whole temperature range. The model in this work presents all the experimental data available, including the solubilities, mean activity coefficients, activities of water, enthalpy and heat capacity of solution, and hydrate dissociation pressure, with good accuracy and consistently up to 220 degrees C, but the model has limitations at temperatures higher than 100 degrees C due to lack of experimental data. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：499 / 511

页数：13

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