Experimental and Predictive Study Using Cryoscopy and Calculation Code Modeling of Seawater at Different Concentrations and Ice Water-Salts Precipitation

This study aims to determine the effect of composition on the precipitation of sea-salts mineral and ice water recuperation on the Moroccan Atlantic Ocean. The main objective of this study is the determination of the optimal conditions of freezing process through the experimental liquid-solid equilibrium of seawater at different concentrations. Hence, the physicochemical parameters of freezing were evaluated through the calculation codes Frezchem and PhreeqcI3 to quantify the effect of the ionic composition of seawater on salinity and the precipitation of ice water and salts. Moreover, the theoretical results obtained were validated by experiment. The experimental results carried out under the determined optimal conditions for different compositions were in good agreement with the theory results obtained. Furthermore, the temperature effect on the liquid-solid equilibrium is demonstrated and evaluated by calculation code modeling. In addition, for each type of salt precipitated for different composition of seawater at different temperature are depending mainly of the solubility variation. The quantity of ice water recuperated is correlated with Ca2+ and SO42− concentration and the experimental results obtained by Freezing seawater process and by calculation code confirmed a negative impact in relation with ice water quality and salts precipitation quantity.