C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/357
C22B 9/18 (2006.01)
Patent
CA 1227643
ABSTRACT OF THE DISCLOSURE PROCESS FOR REFINING METAL A process for refining metal in a crucible containing a layer of molten slag, wherein molten metal passes downwardly through the slag and resolidifies as an ingot thereunder. The slag is kept molten by passing electrical current through the slag layer and between a first electrode and a second electrode. The second electrode has liquid or gas cooling means as an integral part thereof. Current is passed between the first electrode and the second electrode through at least one electrically conductive member interposed between the slag and the second electrode. The electrically conductive member has a melting temperature above the melting temperature and below the bulk temperature of the slag. A portion of the surface of the electrically conductive member that is in contact with the slag has a temperature above the freezing temperature of the slag. The first electrode may be a consumable electrode which is partially immersed in the layer of molten slag such that it gradually melts, and drops of metal move downwardly therefrom. The second electrode is usually the crucible but may be a non-consumable electrode which is partially immersed in the layer of molten slag.
460735
Foster Richard A.
Griebel Arthur H. III
Haynes International Incorporated
Marcoux & Sher Swabey Mitchell Houle
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