Method for the production of a high-purity concentrated...

C - Chemistry – Metallurgy – 22 – B

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C22B 26/22 (2006.01) C01F 5/30 (2006.01) C22B 3/20 (2006.01) C25C 3/04 (2006.01)

Patent

CA 2344943

The present invention is concerned with a method for the extraction of magnesium from magnesium-containing materials such as magnesite, dolomite and silicates materials like serpentine residues, products from the amphibole or pyroxene group. The magnesium-containing material is first leached with hydrochloric acid in at least lone leaching reactor, and subsequently submitted to a series of at least three neutralizing steps in separate reactors under controlled pH and oxydo-reduction potentials. The slurry produced is filtered to produce a substantially pure magnesium chloride solution containing less than 1 ppm of each contaminant (Fe, Ni, Mn etc.) present therein.

L'invention concerne un procédé d'extraction de magnésium de matières contenant du magnésium telles que les matières à base de magnésite, de dolomite, dolomite et de silicates, comme les résidus de serpentins, les produits issus du groupe amphibole ou pyroxène. La matière contenant du magnésium est d'abord lixiviée à l'aide d'acide chlorhydrique, dans au moins un réacteur de lixiviation, puis est soumise à une série d'au moins trois phases de neutralisation, dans des réacteurs séparés, dans des conditions de pH et d'oxydo-réduction contrôlées. La suspension produite est filtrée de sorte qu'une solution de chlorure de magnésium sensiblement pure contenant moins de 1 ppm de chaque contaminant (Fe, Ni, Mn, etc.) présent dans celle-ci, soit produite.

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