Process for manufacture of metallic magnesium

Details Process for manufacture of metallic magnesium Process for manufacture of metallic magnesium

1982-04-29

1984-03-20

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10R, C22B 2622

Patent

active

044378866

ABSTRACT:
A process for manufacture of metallic magnesium. A mixture of a first quantity of magnesium oxide, a second quantity of a carbide forming material which is either a material selected from the group of materials consisting of calcium, aluminum, boron, silicon, calcium oxide, aluminum oxide, boron oxide, and silicon oxide, or is a mixture of two or more of these materials, and whose weight is 10% or less than the weight of the first quantity, and a third quantity of carbon which is at least the equivalent mol weight of that of the magnesium oxide plus the carbide forming material, is heated within a reducing furnace at a pressure between about 5 and 200 torr and at a temperature of at least 1600.degree. C. The carbide forming material combines with the carbon to form carbide, which induces simultaneous reducing reaction as that by carbon and reduces the magnesium oxide, releasing magnesium vapor, which is rapidly cooled down by adiabatic expansion to generate metallic magnesium, while the carbide forming material returns to oxide form. The carbide forming material is recycled again, to repeatedly form carbide and repeatedly reduce more magnesium oxide.

REFERENCES:
patent: 2380449 (1945-07-01), Kirk

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