Recovering noble metals from scrap - in molten alkali metal salt baths which reduce atmos pollution

Process for recovering a particular metal e.g. Ag. Cu or al from scrap without creating atmos. pollution comprises introducing the scrap and a source of O2 into a mass composed of a mixt. of molten metal salts which comprises a, or a mixt. of alkali metal carbonates opt. a major proportion of an alk...

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Bibliographische Detailangaben
Hauptverfasser:	L.F. GRANTHAM, S.J. YOSIM
Format:	Patent
Sprache:	eng ; fre
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:	Process for recovering a particular metal e.g. Ag. Cu or al from scrap without creating atmos. pollution comprises introducing the scrap and a source of O2 into a mass composed of a mixt. of molten metal salts which comprises a, or a mixt. of alkali metal carbonates opt. a major proportion of an alkali metal carbonates with a secondary pref. >=1 wt.% of an alkali metal sulphate, to thermally decompose the scraps and form decomposition products and the required metal. The released metal and the decomposition products are recovered separately, and the molten salt bath is kept at a temp. of 800-1800 degrees C which is > the m.pt. of the metal to be recovered.