Process for the production of high purity magnesium hydroxide

Details Process for the production of high purity magnesium hydroxide Process for the production of high purity magnesium hydroxide

C - Chemistry, Metallurgy

01

F

C01F 5/22 (2006.01)

Patent

CA 2736379

This invention refers to a novel process for obtaining high purity magnesium hydroxide from a solid starting material containing magnesium in the form of, and/or combined with, carbonates, oxides and/or hydroxides, either natural or synthetic. The process comprises leaching the starting material to dissolve the magnesium; the solution is treated with alkali to precipitate the high purity magnesium hydroxide, and the remaining mother liquor is fed to a regeneration step of both the alkali used in the precipitation of high purity magnesium hydroxide, and the acid for leaching. The process of the invention is characterized by recycling reactants (acid and alkali) regenerated in the same process.

La présente invention concerne un procédé novateur permettant d'obtenir de l'hydroxyde de magnésium de grande pureté à partir d'une matière première solide qui contient du magnésium sous forme de et/ou en combinaison avec des carbonates, des oxydes et/ou des hydroxydes, d'origine naturelle ou de synthèse. Le procédé comprend la lixiviation de la matière première afin de dissoudre le magnésium; la solution est soumise à un traitement alcalin afin de précipiter l'hydroxyde de magnésium de grande pureté, puis la liqueur mère résiduelle est introduite lors d'une étape de régénération des deux alcalins utilisés pour la précipitation de l'hydroxyde de magnésium de grande pureté et de l'acide pour la lixiviation. Le procédé susmentionné se caractérise par le recyclage de réactifs (acides et alcalins) régénérés lors du processus lui-même.

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