Sulfur fixing agent without slag accretion agent for magnesium spraying and deep desulphurizing for molten iron , and desulphurization process thereof

• Main Authors: MA QINGSHEN, SHEN FENG, ZHU ZHIYUAN, JIANG ZHONGHANG, WANG YANFENG, LU YANCHUN, LI ZHANJUN, WANG WENJUN, LIU JINGANG, YANG JIANPING, HAO NING
• Format: Patent
• Language: Chinese; English
• Published: 02.03.2011
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; 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

Disclosed is a slag conglomeration agent-free sulfur-fixing agent for magnesium-spraying deep desulfurization in the hot metal pretreatment as well as a desulfurization process thereof, belonging to the technique field of hot metal pretreatment in the steelmaking process. The materials of the sulfur-fixing agent include quicklime, light-burned dolomite and fluorite; and are present in weight percentage: quicklime: 57 to 80 percent, light-burned dolomite: 15 to 35 percent, and fluorite: 0 to 8 percent; and chemical constituents of the sulfur-fixing agent comprise, in weight percentage: CaO: 55to 80 percent, MgO: 5 to 25 percent, SiO2: 0 to 9 percent, CaF2: 0 to 8 percent, Al2O3: 0 to 3 percent, MnO: 0 to 2 percent, K2O: <0.30 percent, Na2O: <0.01 percent, S: <0.025 percent, and P2O5: <0.1percent. The materials are added before hot metal charging or in the hot metal charging process of the hot metal pretreatment. Slag of the sulfur-fixing agent added with molten iron for magnesium-spraying pretreatment has stro