Method for production of calcium compounds

C - Chemistry – Metallurgy – 01 – F

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C01F 11/32 (2006.01) C01F 11/24 (2006.01)

Patent

CA 2710509

The present invention relates to a method for production of calcium compounds having very low content of phosphorus and boron from an impure calcium chloride, solution containing phosphorus and boron, which method comprises the following steps: a) addition of a FeCl3-solution to the calcium chloride solution, b) adjusting the pH of the solution by addition of a base to between 3 and 9.5 for precipitation of iron hydroxide, iron phosphate and boron compounds, c) removal of the solid precipitate from the solution in step b) obtaining a purified calcium chloride solution, d) precipitation of a calcium compound from the solution from step c), and e) separation of the calcium compound from the solution in step d).

La présente invention porte sur un procédé de fabrication de composés du calcium ayant une très faible teneur en phosphore et en bore à partir d'une solution impure de chlorure de calcium contenant du phosphore et du bore. Ce procédé comprend les étapes suivantes consistant à : a) ajouter une solution de FeCl3 à la solution de chlorure de calcium, b) ajuster le pH de la solution par ajout d'une base à pH entre 3 et 9,5 pour faire précipiter de l'hydroxyde de fer, du phosphate de fer et des composés du bore, c) éliminer le précipité solide à partir de la solution de l'étape b) pour obtenir une solution purifiée de chlorure de calcium, d) faire précipiter un composé du calcium à partir de la solution provenant de l'étape c) et e) séparer le composé du calcium à partir de la solution de l'étape d).

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