Using method for recovering refining slag and recycling in converter

• Main Authors: LV YANCHUN, ZHANG XIANG, QIN DENGPING, WANG HAORAN, SUN SHUOMENG, WANG XING
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2012
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; 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; 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 using method for recovering refining slag and recycling in a converter, belonging to the technical field of converter steelmaking. The using method comprises the following steps of: cooling the refining slag, then screening for removing powder, breaking into the appropriate particle size, baking and performing water removal treatment so as to produce refining return slag with the particle size of 20-40mm and the water content of less than 1%; and adding 3-10kg/t of the refining return slag after slag splashing of the converter according to the situation of converter slag, thereby reducing the temperature of the converter slag, solidifying the residual slag in the converter, thickening the converter slag, reducing the liquid slag and simultaneously reducing the oxidability of the converter slag. The refining return slag comprises the following components by weight percent: 30-70% of CaO, 7-16% of MgO, 6-30% of SiO2, 10-45% of Al2O3, 0.3-2.5% of FeO and 0.3-2.5% of TFe. The using meth