Sea-water solubility phase diagram. Application to an extractive process

Cohen‐Adad, R.; Balarew, Chr.; Tepavitcharova, Stefka; Rabadjieva, D.

doi:10.1351/pac200274101811

Cited by 15 publications

(14 citation statements)

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“…Thus Epsomite replaces Astrakanite, KCl supplants Kaïnite and Hexahydrite substitutes kieserite. Therefore the "solar diagram" that reflects solubility in the metastable region [6,17], exhibits solar salt sequences similar to the experimental ones obtained for the considered brines. In the case of sebkhat El Melah de Zarzis Kaïnite and Kieserite are replaced by Hexahydrite (no expected KCl due to the position of the natural brine on the diagram).…”

Section: Discussionsupporting

confidence: 71%

“…Since the crystallisation, of the recovered salts, happens in metastable fields [6,10,17] it can be presumed that the above enumerated salts exhibit a low crystallisation rates and need high supersaturations. Indeed Autenrieth, talking about the crystallization of NaCl, KCl and some other double potassium magnesium salts, said " we can say that when seconds are needed for KCl and NaCl crystallization, minutes are needed for shoenite (K 2 SO 4 .…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, many compounds may be observed during a crystallisation sequence. Usually many authors simplify the representation of these phase equilibrium, they consider only the major elements [3][4][5][6]. As a result the quinary system Na…”

Section: Foreseeable Crystallisation Sequence Of Saltsmentioning

confidence: 99%

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Minerals successions crystallisation related to tunisian natural brines

M’nif¹,

Rokbani

2004

Cryst. Res. Technol.

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Natural brines sampled from Sebkhats in southern part of Tunisia are considered to be seawater-type solutions. The equilibrium solubility of this kind of solutions might be described by the fivefold seawatertype system NaThe crystallisation sequences of salts, observed under solar evaporation, of two different Tunisians brines is discussed. Very important differences between the foreseeable results, based on the Equilibrium Solubility Diagram at 25°C, and the experimental ones are settled. An attempt to explain the differences, based on the so-called "solar sequences" as well as the "solar diagram" of evaporation, is made.

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

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Minerals successions crystallisation related to tunisian natural brines

M’nif¹,

Rokbani

2004

Cryst. Res. Technol.

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“…For this purpose, we agreed to study this kind of saline solutions previously studied by many authors [12,13], assimilated to a quinary system represented by Na + , For this purpose, we agreed to study this kind of saline solutions previously studied by many authors [12,13], assimilated to a quinary system represented by Na + ,…”

Section: Methodsmentioning

confidence: 99%

Magnesium salts as compounds of the preparation of magnesium oxide from Tunisian natural brines

Behij¹,

Hammi²,

Hamzaoui³

et al. 2013

CI&CEQ

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Magnesium oxide is one of the most important magnesium compounds used in industry. The production of MgO is often done from calcined magnesium carbonate or from natural magnesium saline solutions (sea water and brines). In the case of these solutions, magnesium oxide is precipitated after the addition of a strong base (eg. Ammonia). Magnesium hydroxide is calcined after its separation from the excess resulting from the strong base through filtration. Thus, magnesia qualities may differ depending on several physical parameters and particularly on the nature of the compound. Consequently, two different compounds were selected: magnesium chloride and magnesium sulphate which can be recovered from Tunisian natural brines. Three physical factors were considered: calcination temperatures, precipitation temperatures and calcination time of Mg(OH)2. The decomposition of Mg(OH)2 was investigated by DTA/TGA. Mass losses vary in the range (23.0%-29.9%). Starting decomposition temperatures are between 362°C and 385°C. The MgO produced from MgSO4 under 1000°C within 48 hours of calcination time and with 40°C as a reaction temperature for Mg(OH)2 shows a good crystallinity and is of a cristallyte size of 86.3 nm and has a specific surface area equal to 16.87 m2g-1. Finally, morphological differences between MgO agglomerates at different temperatures were observed by SEM. Consequently, magnesium sulphate as precursor for preparing MgO is selected

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“…The trivariant volumes obtained in this way form the structures of the relevant Janecke diagrams of the system; they also reflect the structures of the solubility diagrams of the system. While paths through the solubility diagram can simulate an extractive process when the initial and final states of the system are known (Cohen-Adad 2002), the volumes obtained in this work can also guide the same crystallization processes required in extractive processes.…”

Section: Resultsmentioning

confidence: 99%

Phase equilibria in the sea-water Na, K, Mg//Cl, SO4–H2O quinary system at 0 °C

Tursunbadalov

Солиев

2020

Braz. J. Chem. Eng.

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The phase equilibria in the quinary Na, K, Mg//Cl, SO 4-H 2 O seawater system at 0 °C were determined and a total phase equilibria diagram for the system was constructed by means of the translation method consistent with available literature data. There are seven points, 21 curves and 22 fields saturated, respectively, with 4, 3 and 2 equilibrium solid phases, for the quinary composition of the system. The constructed total phase equilibria diagram of the system was fragmented into divariant co-crystallization fields of two different solid phases and trivariant crystallization volumes of each of the solid phases at equilibrium. The structures of nine Janecke dry-salt phase diagrams were obtained by fragmentation of the total phase equilibria diagram into crystallization volumes. The comparison with the available literature data shows that, the obtained crystallization volume for halite agrees well with the available experimental data.

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Sea-water solubility phase diagram. Application to an extractive process

Cited by 15 publications

References 1 publication

Minerals successions crystallisation related to tunisian natural brines

Minerals successions crystallisation related to tunisian natural brines

Magnesium salts as compounds of the preparation of magnesium oxide from Tunisian natural brines

Phase equilibria in the sea-water Na, K, Mg//Cl, SO4–H2O quinary system at 0 °C

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