Upgrading of magnesium containing materials

Details Upgrading of magnesium containing materials Upgrading of magnesium containing materials

C - Chemistry, Metallurgy

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F

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C01F 5/02 (2006.01) C01F 5/06 (2006.01) C01F 5/42 (2006.01)

Patent

CA 1101636

A B S T R A C T The invention is concerned with the recovery of relatively pure magnesia from magnesite which is normally contaminated with too much silica and silicates to permit the magnesite simply to be calcined for the recovery of refractory grade magnesia. The magnesite in its raw uncalcined state is treated with SO2 at elevated temperatures preferably between 50 and 60°C thereby rapidly dissolving a high proportion of magnesium as magnesium bisulphite without the cost of initial calcination and without dissolving above about 1% of SiO2 present in the magnesite. The solution of magnesium bisulphite can thus be purified by filtration and magnesia may be recovered in known manner from the purified solution.

279900

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