Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied...
Patent
1977-06-20
1979-01-09
Dost, Gerald A.
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
C22B 900
Patent
active
041335171
ABSTRACT:
A method is provided for the continuous purification of an impure metal in a column consisting of a slurry of metal crystals in liquid metal, said column having a relatively hot zone and a continuous temperature gradient between said zones; the temperature of the cool zone being such as to permit coexistence of liquid and crystalline metal, and said hot zone being at a temperature sufficient to melt the crystals. A portion of the column in the said cool zone is chilled to form a coherent mass of crystals of the metal; then incipient melting in the mass is allowed to occur to release crystals from the mass into the column of the crystals in the liquid metal in the cool zone of said column. The crystals are transported through the temperature gradient and into the hot zone, wherein melting of the crystals occurs and the hot zone thereby becomes enriched with the pure liquid metal.
In normal operation, impure feed metal is supplied to the column; purified liquid metal is withdrawn from the hot zone; and impurity-enriched metal is withdrawn from the cool zone.
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Esdaile James D.
Walters Graeme W.
Commonwealth Scientific and Industrial Research Organization
Dost Gerald A.
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