Industrial process of preparing magnesia of high purity

Details Industrial process of preparing magnesia of high purity Industrial process of preparing magnesia of high purity

1974-11-29

1976-09-14

Meros, Edward J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423163, 423164, 423166, 423636, 423637, C01F 502

Patent

active

039807533

ABSTRACT:
Magnesia of very high purity is produced industrially from a magnesite waste material wherein impurities are present in such amounts that the weight ratio of the precipitable hydroxide ions, calculated as the sum of Fe.sub.2 O.sub.3 + Al.sub.2 O.sub.3 + Cr.sub.2 O.sub.3 + Mn.sub.3 O.sub.4 to the sum of SiO.sub.2 + TiO.sub.2 + B.sub.2 O.sub.3, is at least 1 : 3. The starting material is dissolved in hydrochloric acid of 15-32% concentration, the impurities are precipitated by adjusting the pH of the acidic solution to 4 - 9, and the purified magnesium chloride solution is thermally decomposed into magnesia and hydrochloric acid gas, the latter being recycled to form the hydrochloric acid of the stated concentration for dissolving the starting material.

REFERENCES:
patent: 2398493 (1946-04-01), Butt et al.
patent: 2473534 (1949-06-01), Lloyd
patent: 3567378 (1971-03-01), Ferris

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