TREATMENT OF STEEL MILL WASTE DUSTS CONTAINING ZINC

Steel mill and foundry waste dusts containing zinc and/or lead oxides in addition to iron oxides are briquetted by means of a hydrocarbonaceous binder, together with sufficient carbon to reduce at least the lead and zinc oxides to the metal; the briquettes are preferably preferentially treated with...

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Bibliographische Detailangaben
1. Verfasser:	ALLEN J,US
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MANUFACTURE OF IRON OR STEEL METALLURGY METALLURGY OF IRON 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:	Steel mill and foundry waste dusts containing zinc and/or lead oxides in addition to iron oxides are briquetted by means of a hydrocarbonaceous binder, together with sufficient carbon to reduce at least the lead and zinc oxides to the metal; the briquettes are preferably preferentially treated with an oxygen-containing gas at 350 DEG to 600 DEG F to selectively react with the binder to obtain strong briquettes; and the briquettes are then heated to a temperature of between 1,800 DEG to 2,500 DEG F to cause any zinc or lead present to first be reduced to metal and be volatilized as metal, and then be oxidized to ZnO and PbO respectively in the gaseous phase. The zinc and lead oxides are recovered from the exhaust gases in an appropriate dust collector while the iron-bearing briquettes are cooled in a nonoxidizing atmosphere, and are then used as ferrous charge in the iron or steelmaking processes.