Production method of vanadium aluminum alloy with low impurity. The production method includes vanadium penoxide, aluminum metal and coolant as the charge after mixing into the open reaction furnace, ignition smelting vanadium aluminum alloy and slag, in which vanadium penoxide and aluminum metal weight ratio of 1.15 ~ 1.8:1, the coolant particle size is less than 0.25mm vanadium aluminum alloy particles, And the amount of coolant added can ensure that the unit charge heat control for 3300 ~ 3500kJ/kg, unit charge heat is equal to the heat generated by the reaction of vanadium pentoxide and aluminum metal and vanadium pentoxide, aluminum metal and the total amount of coolant added ratio. In the vanadium aluminum alloy produced by the method of the invention, the V content is 62.9 ~ 87.13wt%, the Al content is 12.6 ~ 36.8wt%, the Fe content is not more than 0.16wt%, and the Si content is not more than 0.19wt%.
Vanadium aluminum alloy is a kind of basic raw material used in titanium alloy, which is the second largest application field after vanadium in steel. The two titanium alloys, Ti-6Al-4V and Ti-8Al-1Mo-1V, together account for 50% of the titanium alloy market and are mainly used in the production of jet engines, high-speed aircraft frames and rocket engine casings. The vanadium used in titanium alloy production is added in the form of vanadium aluminum alloy.
Generally, vanadium pentoxide is used as raw material in the production process of vanadium aluminum alloy, which is produced by thermite method. It should be noted that thermite method is a method to obtain high melting point metal elements by using the reducibility of aluminum. Thermite is a mixture of aluminum and metal oxides. The aluminum powder and a certain amount of high melting point metal oxide (such as iron oxide, etc.) mixed, ignited with magnesium strip, aluminum powder can be seen at a higher temperature, the reaction gives off a lot of heat, and emit a dazzling light, the product is alumina and the high melting point metal elemental. Thermite reaction is very intense, so it is difficult to extinguish after ignition, and it is difficult to control the reaction process after ignition. The reaction is to load the charge and generate a high temperature (170(TC~3000°C) quickly after ignition to make the charge in the melting state, and then the alloy refining. The advantages of this smelting method are that it does not need electric heating input, low energy consumption and lower production cost than the electric arc furnace smelting method.
In the production of vanadium aluminum alloy by thermite method, due to the reaction of vanadium pentaoxide and aluminum metal to release a large amount of heat, heat excess, so that the reaction appears explosive, in the case of adiabatic enough to make the temperature of the system to rise to 3000°C above. Therefore, a certain amount of inert material (commonly known as antiheat agent, for example, lime) is usually added to the charge to control the reaction rate and temperature rise of reaction products. Because the antiheat agent always contains a certain amount of Fe, S1, P and heavy metal elements, the impurity content of vanadium aluminum alloy produced is high, so it is difficult to get vanadium aluminum alloy with impurity content in line with the national standard.
