METHOD FOR TREATMENT OF CHROMIUM-CONTAINING HOT METAL AND SLAG

[Problem] To provide a means for reducing and collecting chrome from slag with simultaneously promoting desulfurization of molten iron, as directed to chrome-containing molten iron and slag to be obtained in electric furnace operation using CaF 2 -free slag. [Means for Resolution] In mechanically st...

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Bibliographische Detailangaben
Hauptverfasser:	MORI Masakazu, YOSHINO Takahiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CHEMISTRY DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE FURNACES HEATING KILNS LIGHTING MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON OVENS PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL RETORTS TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS WEAPONS
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Beschreibung
Zusammenfassung:	[Problem] To provide a means for reducing and collecting chrome from slag with simultaneously promoting desulfurization of molten iron, as directed to chrome-containing molten iron and slag to be obtained in electric furnace operation using CaF 2 -free slag. [Means for Resolution] In mechanically stirring a chrome-containing molten iron produced in an electric furnace and having a Cr content of from 8.0 to 35.0% by mass, and a CaF 2 -free electric furnace slag formed during the molten iron production, including Cr 2 O 3 , SiO 2 and CaO as the constituent components and having a basicity CaO/SiO 2 of from 0.7 to 1.7, with an impeller in a refining vessel, a metal Al-containing substance and CaO are put into the vessel before the end of stirring to thereby control the basicity of the slag after the end of stirring to at least 1.9.