C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/263
C22B 26/22 (2006.01)
Patent
CA 1194700
ABSTRACT OF THE DISCLOSURE A process is provided herein for the manufacture of metallic magnesium. A mixture of a first quantity of magnesium oxide, a second quantity of a car- bide-forming material, which is either a material selected from the group con- sisting 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 5 and 200 torr and at a temperature of at least 1600°C. In the furnace there are two reactions, namely a first reaction to generate carbide from the selected carbide-forming material and the carbon, and a second reaction to reduce the magnesium oxide by the carbide, thereby generating magnesium vapor while regenerating the carbide-forming material. The magnesium vapor is rapidly cooled by adiabatic expansion to generate metallic magnesium, while the carbide-forming material returns to oxide form. The carbide-forming material is recycled again, repeatedly, to form carbide and repeatedly to reduce more magnesium oxide.
402338
Miura Hirohisa
Natsume Toshio
Satou Hiroshi
Borden Ladner Gervais Llp
Toyota Jidosha Kabushiki Kaisha
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