Preparation of pure magnesian values

Details Preparation of pure magnesian values Preparation of pure magnesian values

1978-08-23

1979-12-18

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423430, C01F 524

Patent

active

041794907

ABSTRACT:
The recovery of a magnesium carbonate of high purity from an aqueous slurry comprising a mixture of calcium carbonate and hydrated magnesium carbonate is disclosed. Carbon dioxide is introduced into the slurry while the temperature thereof is maintained not higher than about 40.degree. C. to produce an appreciable concentration of magnesium cations in the water of the slurry. Introduction of carbon dioxide is discontinued while most of the calcium is present as the carbonate. Solids are then separated from the aqueous solution of magnesium cations which is produced. Also disclosed is the removal, e.g., by means of a vacuum pump, of carbon dioxide from the aqueous solution of magnesium cations to precipitate magnesium carbonate and the separation of precipitated magnesium carbonate from the aqueous phase. The aqueous slurry comprising a mixture of calcium carbonate and hydrated magnesium carbonate can be produced by charging a reaction vessel with water and particulate material containing a mixture of at least one calcium compound including calcium oxide and at least one magnesium compound including magnesium oxide, bubbling carbon dioxide into the vessel for reaction to produce calcium and magnesium carbonates, separating solids including calcium carbonate and hydrated magnesium carbonate from the associated aqueous phase, controlling temperature of the reaction mixture prior to the separation of calcium and magnesium carbonates so that substantially all of the magnesium ions are present as hydrated magnesium carbonate at the time of separation, and slurrying the separated solids with water.

REFERENCES:
patent: 3402017 (1968-09-01), Ruiz

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