METHOD FOR RECOVERING AND REFINING COPPER

PROBLEM TO BE SOLVED: To improve the recovering ratio of copper by separating calcium ferrite slag formed on the surface of molten copper, adding Ca source in the slag, adjusting Ca content in the slag in the specific range, reducing the slag for converting copper oxide in the slag into the molten c...

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Bibliographische Detailangaben
Hauptverfasser:	MIKUNI FUMIO, SATO SUMIYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve the recovering ratio of copper by separating calcium ferrite slag formed on the surface of molten copper, adding Ca source in the slag, adjusting Ca content in the slag in the specific range, reducing the slag for converting copper oxide in the slag into the molten copper and recovering. SOLUTION: Flux is added to the molten copper to form the calcium ferrite slag and impurity in the molten copper is absorbed in the slag. The slag is desirable to contain Fe and Ca at >=87 wt.% as iron oxide and 3-13 wt.% as calcium oxide. The Ca source is added to the slag separated from the molten copper and the Ca content in the slag is adjusted to 20-28 wt.% to the total content of the iron oxide and the calcium oxide. Then, the slag is reduced and the copper oxide in the slag is converted into the molten copper. This reduction is desirable to execute until the copper content in the slag becomes 4-10 wt.% as the copper oxide.