Method for producing medium and low carbon ferromanganese through furnace refining

• Main Authors: XIAO QINGAN, ZHANG JIANLIANG, WANG CHUANLIN, HE FENGFENG
• Format: Patent
• Language: Chinese; English
• Published: 20.07.2011
• 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

The invention relates to production of a high-quality manganese ferroalloy product and provides a method for refining high carbon ferromanganese into medium and low carbon ferromanganese through furnace refining. The method comprises the following steps: (1) pouring high carbon and medium carbon ferromanganese to a refining furnace and adding a slag charge and manganese oxide accounting for 20 to40 mass percent of the slag charge to prepare new slag; (2) blowing pure oxygen into the furnace from the bottom or side, controlling the temperature of a molten pool to less than 1,450 DEG C by adding magnesium oxide or iron oxide, and refining the carbon ferromanganese till the carbon content meets the medium and low carbon standard; (3) adding a refining agent to further refine for deep dephophorization and desulfurization, and adjusting the content of the manganese oxide in the slag to less than 8.0 percent; (4) finally, adding a manganese replenishing agent to carry out manganese replenishment operation, and fini