FeV Smelting Method

Ferrovanadium smelting method

Using 75% ferrosilicon and a small amount of aluminum as the reducing agent, the flake Vanadium pentoxide produced by the electrosilicothermal method is refined into qualified products through two stages of reduction and refining in an alkaline electric arc furnace. During the reduction period, all the reducing agents in one furnace and 60 to 70% of the total flake Vanadium pentoxide are put into the electric furnace, and silicon thermal reduction is performed under high calcium oxide slag.

When the V2O5 in the slag is less than 0.35%, the slag (called lean slag, which can be discarded or used as building materials) is discharged and transferred to the refining stage. At this time, add flake Vanadium pentoxide and lime to remove excess silicon, aluminum, etc. in the alloy liquid. When the alloy composition meets the requirements, slag and ferroalloys can be produced.

The slag released in the later stage of refining is called rich slag (V2O5 content is as high as 8 to 12%), which is recycled when the next furnace starts charging. The alloy liquid is generally cast into cylindrical ingots, which are then cooled, demoulded, crushed, and slag removed to become finished products. This method is usually used to smelt ferrovanadium containing 40 to 60% vanadium. The recovery rate of vanadium can reach 98%. The power consumption for refining ferrovanadium per ton is approximately 1,600 kW·H.

The thermite method uses aluminum as the reducing agent and uses a low ignition method to smelt in a furnace barrel lined with an alkaline furnace. First, a small part of the mixed charge is put into the reactor, which is ignited. After the reaction begins, the remaining charges are added sequentially. It is usually used to smelt high-vanadium iron (containing 60-80% vanadium). The recovery rate is slightly lower than that of electrosilicothermal method, about 90-95%.