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Abstract  

The phase diagram of the ternary system NaCl-FeCl3 -H2 O was determined at four different temperatures (5, 15, 30 and 50C) by conductometry and thermal method. The experimental results show that in the temperature range 5 to 30C, only NaCl and FeCl3 6H2 O were present as solid phases. For the 50C isotherm, we have observed the crystallization fields of the NaCl and FeCl3 2,5H2 O.

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Abstract  

A semi-empirical model consistent with thermodynamical conditions of equilibrium was used and oriented to the calculation of phase diagrams of the binary systems H2 O-MgCl2 , H2 O-FeCl2 and H2 O-FeCl3 . For each solid phase, the exploitation of the experimental and bibliographical data gives a liquidus curve equation comprising a limited number of parameters. A such equation allows to calculate with precision the solubility of the stoichiometric solid phase in a large range of temperature and composition.

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Journal of Thermal Analysis and Calorimetry
Authors: A. Atbir, L. Aneflous, A. Marrouche, M. El Hadek, R. Cohen-Adad, and M.-Th. Cohen-Adad

Abstract  

Polytherm diagram of the ternary system KCl–FeCl2 –H2 O between 0 and 70C. Phase equilibria in the KCl–FeCl2 –H2 O system were studied over the temperature range 0–70C by conductimetric and analytical methods. A solubility polytherm of the system was constructed. We have observed the crystallization fields of the KCl and FeCl2 6H2 O (at 0C), KCl and FeCl2 4H2 O (at 15, 30 and 40C) and KCl, FeCl2 4H2 O and of a double salt KClFeCl2 2H2 O are obtained at 70C.

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Conversion of phosphogypsum to potassium sulfate

Part I. The effect of temperature on the solubility of calcium sulfate in concentrated aqueous chloride solutions

Journal of Thermal Analysis and Calorimetry
Authors: A. Aagli, N. Tamer, A. Atbir, L. Boukbir, and M. El Hadek

Solubility of calcium sulfate in concentrated aqueous chloride solutions is of particular significance in chloride hydrometallurgy and various crystallization processes, such as the production of potassium sulfate from phosphogypsum and potassium chloride. This paper examines an example of the second type of application in which gypsum and potassium chloride are reacted to form K2SO4. The solubility of phosphogypsum in aqueous solutions of KCl, HCl, and mixtures of both has first been measured at various temperatures and concentrations. The parameters investigated are HCl concentration up to 6M, KCl concentration up to 180 g L-1 and temperature from 25 to 80°C. In addition, the influence of co-existing chloride salts, such as (HCl+KCl), on the solubility of calcium sulfate is estimated from 25 to 80°C. The solubility increases obviously with the temperature increment as it does initially with acid concentration, reaching a maximum of about 3M HCl, 130 g L-1 KCl and then drops. At the same time, the solubility of CaSO4·2H2O decreases with increasing KCl concentration.

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Abstract  

Desalination of sea-water was investigated. Effluent of desalination plant was evaporated in isotherm and isobar condition. Density, electric conductivity measurements and chemical analysis were carried out during the process. The results characterising the crystalline phase provide the fields and limits of the precipitation and separation.

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Journal of Thermal Analysis and Calorimetry
Authors: A. Atbir, S. Mançour Billah, A. Marrouche, M. El Hadek, R. Cohen-Adad, and M.-Th. Cohen-Adad

Abstract  

The phase diagram of ternary system Na+ , Fe2+ /Cl -H2 O was established over the temperature range 0–70C by conductimetric and analytical methods. A solubility polytherm of the system was constructed. For each temperature, we have determined the nature of the solid phase in equilibrium with the solution and the limit of its area of existence.

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