Vanadium-titanium magnetite is beneficiation by concentration and then is smelting vanadium pig iron by a blast furnace, extraction of vanadium slag during in process of the Furnace or in nebulized blowing converter. Vanadium slag after crushed to add sodium (soda ash, salt, or anhydrous Glauber's salt) to sodium oxide to calcination, so that the partial vanadium will become soluble sodium vanadate (NaVO3), purified leaching of ammonium sulfate precipitation increasing more than V ammonium [(NH4) 2V6O16], then deaminase melting to cast vanadium pentoxide flake. Requirements of components is V2O597 ~ 99%, P <0.05%, S <0.05%, Na2O + K2O <1.5%. In addition, it contains vanadium pentoxide directly got through chemical processing from iron ore vanadium or vanadium-containing carbonaceous shale extraction.
Several extraction methods are described below
Silicon thermal power
Use 75% ferrosilicon and a small amount of aluminum as reductant, vanadium pentoxide in the electric arc furnace in the alkaline, after two-stage reduction and smelting refining becomes qualified products. Furnace to restore the view to a reducing agent and the total of all 60 to 70% of vanadium pentoxide flake into the furnace, blast furnace slag in high-calcium oxide, the reduction to silicon. When the slag is less than 0.35% of V2O5, the release of slag (referred to as depleted slag, or disposable materials to use), into the refining period. At this point, vanadium pentoxide flake and adding lime to the removal of excess liquid alloy of silicon, aluminum, etc., as soon as the alloy composition to meet the requirements of the slag to the iron alloy. Refining the late release of the slag as slag rich (including V2O5 up to 8 ~ 12%), in the beginning of the next feeding furnace, the return to use. Generally cylindrical liquid alloy ingot cast by the cooling, stripping, broken after Java and clearance for the finished product. This method is generally used with V-40 ~ 60% of the vanadium-iron smelting. Vanadium recovery rate of up to 98%. Iron consumption per tonne of vanadium refining 1600 kilowatts / hours
method of Aluminum-thermal
Use Aluminum as reducing agent, in alkaline lining of the furnace tube, take the lower part of the ignition method to smelting. First put a small number of mixed reacto into charge, and then ignition. after reaction started, adding the remaining charge after another. Normally used for high-vanadium iron smelting (including V-60 ~ 80%), recovery rate is lower than the silicon thermal power about 90 ~ 95%
Vanadium and iron-type drilling often show the same quality of steel and seperately occurs in titanium in magnetite and pyrite. Beneficiation of such ores, generally use weak magnetic to separate vanadium iron ore, and then let re-election, strong magnetic separation, flotation, separation beneficiation methods work toghether to recover ilmenite from the tailings and recover pyrite by the use of flotation. Titanium contented in Vanadium is not removed by beneficiation but can be isolated in smelting. In order to meet the necessary high iron slag Slag volume, sometimes it is unreasonable to excessive increase the grade of vanadium iron ore. The process that to recover titanium from the magnetic separation tailings, first of all ensures quality titanium concentrate. Studied the re-election, flotation, flotation of a re-election, a re-election of a strong magnetic flotation, the re-election of a strong magnetic separation and other processes, Featured election uses electricity ilmenite concentrate and can improve the grade of titanium dioxide to more than 48%. Ilmenite flotation is carried out in acidic pulp and flotation recovery of pyrite flotation ilmenite cobalt should be carried out before, if the ore contains carbonate minerals, must be visible
