Process to produce sodium sulfate and magnesium hydroxide

C - Chemistry – Metallurgy – 01 – F

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C01F 5/14 (2006.01) C01D 5/00 (2006.01) C01D 5/16 (2006.01)

Patent

CA 2653718

This invention refers to a novel process to obtain magnesium hydroxide and sodium sulfate from a solid raw material, which contains sodium and magnesium soluble salts, preferably in the form of sulfates, coming from a natural source or as a byproduct of an industrial process. The process consisting in the conditioning of the raw material to guarantee the correct concentrations of sodium and magnesium sulfates that is subjected to a salting-out crystallization when mixed with sodium sulfate obtaining sodium sulfate; the resulting solution is subjected to an alkali treatment to precipitate the magnesium hydroxide and the mother liquor is fed to a regeneration stage of the alkali used in the precipitation of the magnesium hydroxide as well in the sodium sulfate solution for the crystallization. The crystallization can be performed as a multistage process countercurrent to increase the purity of sodium sulfate.

La présente invention concerne un nouveau procédé pour l'obtention d'hydroxyde de magnésium et de sulfate de sodium à partir d'une matière première solide contenant des sels solubles de sodium et de magnésium, de préférence sous forme de sulfates, provenant d'une source naturelle ou arrivant comme sous-produit d'un procédé industriel. Ce procédé consiste à conditionner la matière première afin d'obtenir la concentration appropriée en sulfates de sodium et de magnésium, ladite matière étant soumise à une cristallisation de type "relargage" lors de son mélange avec du sulfate de sodium, d'où l'obtention du sulfate de sodium. La solution résultante subit alors un traitement alcalin destiné à précipiter l'hydroxyde de magnésium, la liqueur mère étant soumise à une étape de régénération, tant de l'alcali utilisé dans la précipitation d'hydroxyde de magnésium que de la solution de sulfate de sodium pour la cristallisation. La cristallisation peut être réalisée comme un procédé en plusieurs étapes à contre-courant en vue d'une augmentation de la pureté du sulfate de sodium.

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