METHOD FOR VACUUM-REFINING CRUDE COPPER

PURPOSE:To remove efficiently impurities from crude copper by melting the crude copper in a vacuum furnace and bringing the molten crude copper into contact with a gas contg. oxygen. CONSTITUTION:Crude copper is melted by heating to about 1,200-1,350 deg.C in a vacuum furnace kept at about 0.05-100T...

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Bibliographische Detailangaben
Hauptverfasser:	YABE TOORU, KATOU MASANORI, HINO JIYUNZOU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To remove efficiently impurities from crude copper by melting the crude copper in a vacuum furnace and bringing the molten crude copper into contact with a gas contg. oxygen. CONSTITUTION:Crude copper is melted by heating to about 1,200-1,350 deg.C in a vacuum furnace kept at about 0.05-100Torr degree of vacuum. A gas contg. oxygen such as air is introduced into the furnace from a hole pierced in the furnace, and the gas is brought into contact with the molten crude copper. Impurities, especially Sb, Bi and As are efficiently removed from the crude copper.