Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines

Abstract : This study is a contribution to the characterization and the treatment of alkaline industrial wastes. The direct carbonation of residual brines (RB) by CO2 bubbling results in a gas emission reduction and a potentially valorization of resulting products. This research was focused on carbonate products. The main objective is to link reactivity and valorization (here, desulfurization of industrial fumes). The RB are complex, their chemical and mineralogical composition was studied in particular by Raman spectroscopy to monitor OH-Cl interaction in humid samples. The different hydroxides phases are consumed during carbonation to precipitate calcium carbonates (calcite and aragonite). The chemical composition of RB determines the main part of the reaction of carbonation whereas physical parameters influence the reaction kinetics, the by-products morphology and purity. The feasibility of on-line monitoring of the phases evolution during carbonation using spectroscopy has been validated and a first statistical model for the prediction of carbonate concentration has been developed. The second part of this works concerns the characterization of precipitated carbonates and some parameters as hydration which can influence their valorization. The importance of hydration on the carbonates reactivity was observed in microscopy and at pilot scale. Desulfurization tests of industrial fumes in semi-humid way provided a conversion rate of SO2 ranging between 65 and 70%
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Mathilde Grandjean. Étude de la réactivité et de l'hydratation des particules obtenus par carbonatation de saumures alcalines. Alimentation et Nutrition. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0311⟩. ⟨tel-01750653⟩

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