METHOD FOR CONCENTRATING AND RECOVERING ZN IN ZN-CONTAINING STEELMAKING DUST

PURPOSE:To efficiently recover steelmaking dust containing high concn. of Zn by recovering the dust containing a large part of ZnO at the initial stage of blowing, charging into a converter in the following operation and repeating the operation recovering Zn containing dust at the initial stage of b...

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Bibliographische Detailangaben
Hauptverfasser:	TAKEI HIROMICHI, IO YUKITO, SUGA NORIAKI, FUJIKURA NOBUYUKI
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 METALLURGY OF IRON PRETREATMENT OF RAW MATERIALS PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL 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 IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To efficiently recover steelmaking dust containing high concn. of Zn by recovering the dust containing a large part of ZnO at the initial stage of blowing, charging into a converter in the following operation and repeating the operation recovering Zn containing dust at the initial stage of blowing. CONSTITUTION:Molten iron is introduced into the converter 1 and scrap containing Zn-containing waste material is charged. Exhaust gas containing Zn-containing dust at the initial stage of oxygen blowing is cooled in a gas cooler 2 and the Zn-containing dust is collected with a horizontal type cyclone 3 and recovered in a Zn-containing dust storing vessel 7 at the lower part. The dust containing no Zn is collected in the horizontal type cyclone 3 and recovered into an Fe base dust storing vessel 9. The Zn-containing dust recovered in the Zn-containing dust storing vessel 7 is charged into the converter 1 after introducing the molten iron before starting the following oxygen blowing. The exhaust gas containing the Zn-containing dust at the initial stage of oxygen blowing is cooled in the gas cooler 2 and the Zn-containing dust is collected in the horizontal type cyclone 5 and recovered to Zn containing dust storing vessel 7. This operation is repeated.