METHOD AND APPARATUS FOR TREATING IRONMAKING DUST

An object of the present invention is to separate and recover iron and nonferrous metals, such as zinc, contained in iron-and steel-making dust, by mixing the dust with charcoal material and conducting reduction processing in an externally heated-type rotary furnace. Dust and charcoal material are m...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KOTANI, SEIICHI, MORIDERA, HIROMITSU, SHIGEZUMI, TADAYOSHI
Format:	Patent
Sprache:	eng ; fre ; ger
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:	An object of the present invention is to separate and recover iron and nonferrous metals, such as zinc, contained in iron-and steel-making dust, by mixing the dust with charcoal material and conducting reduction processing in an externally heated-type rotary furnace. Dust and charcoal material are mixed with each other at a ratio of 1 : 0.05 to 0.3, and this mixture and reducing gas, which contains hydrogen or carbon monoxide, are charged into an externally heated-type rotary furnace. Iron and nonferrous metals, such as zinc, contained in iron-and steel-making dust are reduced by reducing gas in the furnace, so that zinc is volatilized and separated from solid substance. Water vapor and carbon dioxide, which are generated simultaneously at this time, react with charcoal material, so that they can be changed into hydrogen and carbon monoxide. Therefore, the furnace can contain a highly reducing atmosphere.