TREATING METHOD OF STEELMAKING SLAG

PROBLEM TO BE SOLVED: To provide a treating method of steelmaking slag enabling a highly productive stabilizing treatment of steelmaking slag at a low treating cost, and capable of reducing the amount of CO2emission. SOLUTION: In a treating method of steelmaking slag in which CaO in the steelmaking...

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Hauptverfasser:	UEJIMA YOSHIYUKI, AMADA KATSUMI, TAZAKI TOMOAKI, MUKAWA SUSUMU
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LIME, MAGNESIA MANUFACTURE OF IRON OR STEEL METALLURGY METALLURGY OF IRON REFRACTORIES SLAG TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a treating method of steelmaking slag enabling a highly productive stabilizing treatment of steelmaking slag at a low treating cost, and capable of reducing the amount of CO2emission. SOLUTION: In a treating method of steelmaking slag in which CaO in the steelmaking slag is carbonated by supplying CO2gas while mechanically stirring the steelmaking slag, the steelmaking slag is stirred under a condition wherein particles having a diameter of 10-40 mm are contained in the slag, and the space filling rate η to the stirring vessel is set at 0.03-0.15 to achieve high productivity. Further, η, a vessel diameter D, a number of rotation ω, a water content M, a free lime concentration before the treatment, and a target free lime concentration after the treatment are specified. Further, it has become possible to specify the relation between D and ω, from a target value of the treatment productivity Q, a free lime concentration before the treatment, and a target free lime concentration after the treatment. COPYRIGHT: (C)2007,JPO&INPIT