Process for the recovery of magnesium from magnesium alloys wast

Details Process for the recovery of magnesium from magnesium alloys wast Process for the recovery of magnesium from magnesium alloys wast

1994-11-23

1995-12-19

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1032, 75 1046, 75 1047, 75 1048, 75 105, 75 1054, 75 1055, 420580, 420590, C22B 2622

Patent

active

054765293

ABSTRACT:
A process for recovery of magnesium from magnesium alloy waste by charging an electric furnace with a flux including at least one salt, the flux being inert with respect to magnesium and having a melting point <1000.degree. C. The flux is raised by the Joule effect at a reduced pressure to a temperature of 900.degree. to 1100.degree. C. to produce a bath having a density higher than that of magnesium, a vapor pressure <0.1 torr and an electrical resistivity of between 1 and 10 milliohm.m. The magnesium alloy waste is introduced in the bath, and magnesium and any other elements in the waste which are more volatile than magnesium are recovered from a vapor phase above the bath. Any elements in the waste which are less volatile than magnesium are recovered from a molten phase in a bottom portion of the furnace.

REFERENCES:
patent: 1913929 (1933-06-01), Kerschbaum
patent: 1955964 (1934-04-01), Kemmer
patent: 2787592 (1957-04-01), Burkhardt
patent: 2843473 (1958-07-01), Colbry et al.
patent: 2971833 (1961-02-01), Artu et al.
patent: 4695319 (1987-09-01), Miura et al.
patent: 5167700 (1992-12-01), Wallevik et al.
Metal Progress 1978 Databook Jun. 1978 pp. 104-105.

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