Maîtrise de la précipitation des polymorphes du carbonate de calcium en vue de la conception d’un procédé de purification en réacteur à lit fluidisé

Abstract : The purification process of sodium chloride solutions consists of the precipitation of Ca2+ and Mg2+ ions as calcium carbonate and magnesium hydroxide. The impurity content is low, so the best results can be obtained when the precipitation takes place in a fluidized bed reactor where the solid concentration is high. The improvement of the precipitate quality, mainly composed of CaCO3, is necessary for the good running of the process, thus the control of the calcium carbonate polymorphism is essential. First, a reliable method for the quantitative determination of the polymorphic composition using Raman spectroscopy combined with multivariate curve resolution is developed. Then the key parameters which control the polymorphic. composition are identified through the experiments carried out in a batch reactor. Based on these results, a new process using a fluidized bed reactor is designed and experimentally tested. From these experiments, the optimal operating conditions allowing a high level of purification and a very good solid/liquid separation are determined
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Aurélie Dandeu. Maîtrise de la précipitation des polymorphes du carbonate de calcium en vue de la conception d’un procédé de purification en réacteur à lit fluidisé. Alimentation et Nutrition. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL056N⟩. ⟨tel-01754529⟩

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