Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same

• Main Authors: LIU GUANGMU, PENG ZISHENG, SUN QUNBAO, XIAO HONGGUANG, PENG QICHUN
• Format: Patent
• Language: Chinese; English
• Published: 21.11.2012
• 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

The invention relates to a steel-making technique in the metallurgy industry, in particular to a refining slag system containing BaO and Li2O and a method for producing ultralow-sulfur steel by adopting the same, and the refining slag system can be directly applied in LF furnace top slag to carry out desulphurization. By weight percent, the components of the slag system are as follows: 45 percentto 55 percent of CaO; 3 percent to 10 percent of SiO2; 18 percent to 30 percent of Al2O3; 5 percent to 12 percent of BaO; 0.2 percent to 2.0 percent of Li2O; and 3 percent to 8 percent of MgO. 2kg/t steel to 15 kg/t steel of deep-desulphurizing agent containing BaO and Li2O is added in a ladle or during tapping, 10kg/t steel to 15 kg/t steel of lime is also added, aluminum particles are adopted for deoxidization, and thereby the target slag system can be obtained. When an LP furnace adopts the slag system, the molten iron does not need to be preprocessed, a VD technique is adopted in the next step, and under the circu