| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 623513 | Desalination | 2014 | 8 Pages |
•Thermodynamic modeling of stable and metastable sea-type four component carbonate systems•Thermodynamic simulation of alkaline precipitation of metastable MgCO3·3H2O from waste sea brines•Design of the purified MgCO3·3H2O precipitation from waste sea brines
The thermodynamic simulation of the systems Na+, Mg2 +/Cl−, CO32 −//H2O and Na+, Mg2 +/SO42 −, CO32 −//H2O using the Pitzer method at 25 °C revealed that both stable and metastable crystallizations take place in these systems. MgCO3·3H2O is always a metastable phase. Thermodynamic modeling of Mg2 + removal as a part of desalination of hyper-saline sea-salt waste brines, which can be described by these systems, pointed to the co-precipitation of various salts. Ensuing from the obtained data and considering the crystal chemistry and kinetic crystallization of the co-crystallizing salts we designed the precipitation of MgCO3·3H2O from sea-salt brines avoiding its further transformation to metastable 4MgCO3·Мg(ОН)2·4H2O and stable MgCO3. Our experimental studies confirmed the designed method and optimized the conditions for precipitation of high-purity MgCO3·3H2O with good filtration characteristics.
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