Process for producing magnesium oxide

Details Process for producing magnesium oxide Process for producing magnesium oxide

1985-11-26

1988-01-19

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423165, 423356, 423431, 423470, 423497, 423637, C01F 1104

Patent

active

047203757

ABSTRACT:
High purity magnesium oxide is obtained from a magnesite-containing ore, the impurities of which include calcium compounds. The ore is first calcined and the resulting magnesium oxide is converted to magnesium chloride by leaching with an ammonium chloride solution. Calcium chloride is also produced at the same time. The resulting magnesium chloride and calcium chloride are treated with carbon dioxide to form calcium carbonate and magnesium carbonate which can be precipitated and filtered out of the resulting magnesium chloride solution. The magnesium chloride solution is then reacted with ammonium carbonate to produce a magnesium carbonate trihydrate crystal slurry containing ammonium chloride. The ammonium chloride is subsequently removed and returned to the ammonia recovery stage for leaching of the calcined magnesium oxide while the crystals are dried and decomposed into carbon dioxide and magnesium oxide.

REFERENCES:
patent: 1816996 (1931-08-01), Barrett
patent: 1893047 (1933-01-01), Barrett
patent: 1969769 (1934-08-01), Sweet et al.
patent: 2137675 (1938-11-01), MacIntire
patent: 4335083 (1982-06-01), Benson
patent: 4508690 (1985-04-01), Obrist et al.

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