METHOD FOR ALUMINOTHERMAL PRODUCTION OF FERROMOLYBDENUM Russian patent published in 2012 - IPC C22C33/04 

FIELD: metallurgy.

SUBSTANCE: method includes the following: staged loading and fusion penetration of a charge, containing a molybdenum concentrate, ferrous scale, ferrous punching, lime, ferromolybdenum slag, aluminium and separation of metal and slag. At the first stage the charge is loaded with the speed of 680-850 kg/m²·min., containing the molybdenum concentrate, ferromolybdenum slag, ferrous punching, 90-95% of lime from its mass for melting, 65-75% of ferrous scale from its weight for melting and aluminium in the amount of 0.98-1.0 of ferromolybdenum stoichiometrically required for recovery of alloy elements. At the second stage the charge is loaded with the speed of 105-125 kg/m²·min., containing 25-35% of ferrous scale from its weight for melting, 5-10% of lime from its weight for melting and aluminium in the amount of 2.6-3.0 of ferromolybdenum stoichiometrically required for recovery of alloy elements, and the melt is heated under arcs of an electric furnace of 3-5 times of charge melting.

EFFECT: invention makes it possible to increase extraction of molybdenum in an alloy and alloy quality.

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