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: 20.04.2011
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

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 is realized by the following steps: (1) after standard carbon ferromanganese is produced in an ore heating furnace, directly discharging slag in the furnace and replacing new slag; (2) refining the standard carbon ferromanganese by adopting a pure oxygen side-blowing or bottom-blowing mode, and injecting magnesium oxide or iron oxide to control the temperature of a molten pool to less than 1,450 DEG C, wherein the amount of pure oxygen is determined by decarbonization amount; the amounts of the magnesium oxide and the iron oxide are comprehensively determined by oxygensupply amount and entrained manganese amount; the pure oxygen blowing is used as the primary and magnesium oxide and iron oxide blowing are used as assistance in refining prophase; and the magnesium oxide and iron oxide blowi