Process for the manufacture of pure metallic aluminum from alumi

Details Process for the manufacture of pure metallic aluminum from alumi Process for the manufacture of pure metallic aluminum from alumi

1981-07-24

1984-02-07

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10R, C22B 2102

Patent

active

044301200

ABSTRACT:
The present invention relates to a process for the manufacture of aluminum metal from aluminum ores, clays ashes, bauxites or wasted effluents containing aluminum. The process involves the following steps: (a) a homogeneous mixing of the aluminum-bearing material with a reducing agent, alkali metal chloride selected from sodium chloride and potassium chloride and mixtures thereof and optionally silica; (b) coking the mixture; (c) heating the mixture at a temperature in the range of 900.degree. C. to 1200.degree. C.; (d) reacting the mixture obtained at a temperature in the range of about 1200.degree. C. to 1800.degree. C., optionally in the presence of oxygen and additional energetic coke, obtaining aluminum monochloride gas and molten alkali metal silicate, and (e) rapid cooling of the aluminum monochloride and carbon monoxide at a temperature in the range of about 650.degree. C to 800.degree. C. with a molten sodium-aluminum chloride producing aluminum trichloride and pure aluminum metal.
The invention also relates to an electric blast furnace suitble for the manufacture of aluminum, possessing several rows of electrodes located at various distances, the heat being provided either by electric supply or by carbon combustion which takes place in the furnace. This type of furnace is characterized by its low energy consumption.

REFERENCES:
patent: 3856508 (1974-12-01), Othmer
patent: 4096234 (1978-01-01), Martin et al.
patent: 4188207 (1980-02-01), Adams, Jr.

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