FeV alloy thermite method

Industrial Ferrovanadium thermite method

Very early fervanadium production methods are still in use today, and aluminum is a strong reducing agent. The heat generated by reducing vanadium pentoxide with aluminum is quite large (4577kj/kg mixture). Not only can the thermite smelting process be completed, but the ferrovanadium waste can also be added back to the furnace to lower the reaction temperature; lime, magnesite and fluorite can be added to Reduce the viscosity of slag; adjust the particle size of aluminum particles and vanadium pentoxide flakes to reduce the reaction speed, reduce splash loss, and increase the yield of vanadium.

Magnesium furnace lining for smelting, or annular reaction furnace barrel knotted with vanadium iron slag. Smelting adopts low ignition method. The V2O5 content of the V2O5 fusible sheet is required to be ≥ 98%. The blockiness is <20mm×20mm, and the plate thickness is 3~5mm. Aluminum refers to aluminum particles with an aluminum content greater than 98%, a particle size less than 3mm, and aluminum bubbles of 3 to 10mm. The steel chips are ordinary carbon steel turning chips, and the roll length is <15mm.

After the smelting reaction is completed, cool naturally for 16 to 24 hours. Pull out the furnace barrel, take out the iron vanadium ingot, clean and package it. The composition of ferrovanadium obtained by smelting is: V75%-80%, al1%-4%, si1.0%-1.5%, co.13%-0.2%, s≤ 0.05%, P≤ 0.075%. The composition of the slag includes About 55%-6% V2O3, about 85% (cao+mgo) Al2O3 and about 10%. Ferrovanadium consumption to produce 1t80% vanadium: 1500~1600kg molten vanadium oxide (v2o598%), 810~860kg aluminum (al98%). The smelting recovery rate of vanadium is 90%-95%. In order to reduce the vanadium content in the slag, the slag is heated immediately after the reaction to cause the metal particles suspended in the slag to sink and continue to react with the vanadium oxide and residual aluminum in the slag to increase the recovery rate of vanadium.