Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1988-11-21
1990-01-30
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 68R, C22B 904
Patent
active
048971154
ABSTRACT:
Apparatus for purifying a melt which, besides one or more impurities to be volatilized, contains essentially a light metal, in particular aluminum. The apparatus comprises a vacuum processing vessel, a vacuum pump, one or more conduits for supplying the melt to the vacuum processing vessel and means for spraying the melt into the vacuum processing vessel. According to the invention, the vacuum processing vessel is provided with discharge means for discharging impurities expelled from the melt. The discharge means are connected to a means for separating the impurities in solid or liquid form, connected to the vacuum pump used for maintaining the subatmospheric pressure in the vacuum processing vessel. Connected to the vacuum processing vessel are at least one supply conduit and one return conduit for the melt, the supply conduit being provided with a pump for the melt to be purified and a spray nozzle for atomizing the melt supplied by the pump into the vacuum processing vessel.
During the purification treatment, a subatmospheric pressure is maintained in the apparatus by the vacuum pump, and the temperature of the melt is maintained at 600.degree.-900.degree. C.
REFERENCES:
patent: 3895937 (1975-07-01), Gjosteen et al.
patent: 4456479 (1984-06-01), Harris et al.
Andrews Melvyn
Basseches Mark T.
Basseches Paula T.
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