Magnesium oxide production

Details Magnesium oxide production Magnesium oxide production

C - Chemistry, Metallurgy

01

F

23/280

C01F 5/06 (2006.01)

Patent

CA 1200076

ABSTRACT A process for preparing substantially pure magnesium oxide from crude magnesium-containing compounds which have an iron impurity, which process comprises calcining the crude magnesium- containing compounds to crude magnesium oxide, forming a slurry of the crude magnesium oxide and reacting the slurry with carbon dioxide, removing the unreacted solid from the iron-containing preg- nant magnesium bicarbonate solution so produced and adding a water-soluble aluminium salt to the preg- nant solution to precipitate out the iron, air sparging and/or heating the solution after clari- fication to produce a precipitate of hydrated mag- nesium carbonate and/or basic magnesium carbonate, separating the precipitate and decomposing it to produce substantially pure magnesium oxide.

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