Study of the Effect of Evaporation Temperature on the Qualitative and Quantitative Separation of Marine Mineral Salts: Prediction and Application on the Seawaters of the Atlantic Sea, Morocco

This work aims to determine the temperature effect on the separation of sea- salts mineral on the Moroccan Atlantic coast. The main objective of this study is the determination of the optimal conditions of the evaporation process through the prediction of the liquid-solid equilibrium of seawaters at each stage of the evaporation process. Hence, the physicochemical and thermodynamic properties of evaporation were exploited through the calculation codes Frezchem and PhreeqcI3 to quantify the effect of the ionic composition of raw and concentrated seawater on the evaluation of salinity and on the qualitative and quantitative separation of salts. Moreover, the results obtained by the used calculation codes were validated by experiments. The results obtained from simulation modeling for different temperatures (25 °C, 50 °C, 75 °C and 100 °C) and different compositions were in good agreement with the experimental results carried out under the determined optimal conditions. In addition, it can be concluded from the results that the saturation and quantitative separation thresholds of each type of salt for different concentrations of marine waters are different and this is mainly due to the variation in the solubility of each salt as a function of the variation in temperature. Concerning the temperature effect, it was observed that the quantity and quality of precipitated marine salts by evaporation of the raw and concentrated waters of the Atlantic Ocean varied with the studied temperatures.