Ferro Vanadium

Electro-silicothermic process

With 75% ferrosilicon and a small amount of aluminum as reducing agent, the flake vanadium pentoxide was purified in alkaline electric arc furnace through two stages of reduction and refining. During the reduction period, all the reducing agent of the first furnace and the sheet vanadium pentaoxide accounting for 60 ~ 70% of the total amount were loaded into the electric furnace, and silicon thermal reduction was carried out under the high calcium oxide slag. When the V2O5 in the slag is less than 0.35%, the slag is released (called poor slag, can be discarded or used as building materials), into the refining period. At this time, flake vanadium pentaoxide and lime are added to remove the excess silicon and aluminum in the alloy liquid. When the alloy composition meets the requirements, the iron alloy can be slag out. The slag released in the later stage of refining is called rich slag (containing V2O5 up to 8 ~ 12%), which is returned to use when the next furnace begins to feed. The alloy liquid is generally cast into cylindrical ingot, which is finished after cooling, demolding, crushing and slag removal. This method is generally used for smelting iron vanadium containing 40 ~ 60% vanadium. The recovery rate of vanadium is up to 98%. Refining consumes about 1600 kilowatt-hours per ton of iron vanadium refractory metal products.

Thermite process

Smelting with aluminum as reducing agent is carried out by lower ignition in a barrel lined with alkaline furnace. First, a small part of the mixed charge is loaded into the reactor, that is, ignition. After the beginning of the reaction and then add the rest of the charge. Is typically used for smelting Gao Fantie (containing vanadium 60 ~ 80%), the recovery rate was slightly lower than electrical silicon thermal method, about 90-95%.