Ferrovanadium With Good Quality

It can be seen from the ferrovanadium phase diagram that the melting point of 50 ferrovanadium exceeds 1500°C. The smelting temperature of 50 ferrovanadium is generally controlled above 1600°C. The decomposition temperature of CaC2: is exactly 1600°C (the same as the smelting temperature of 50 ferrovanadium). The decomposition reaction formula is CaC2:=[Ca]+2[C]. It can be seen that the decomposition of CaC: can cause the alloy to increase C (there are strict regulations on C in steel standards). Therefore, in the production of ferrovanadium, the use of CaC2 as a dephosphorization agent is subject to corresponding restrictions.

At 1 atmospheric pressure, the boiling point of calcium is 1483°C. Therefore, at the ferrovanadium smelting temperature, calcium exists in a gaseous state. It can be seen that when calcium is added for dephosphorization under this temperature condition (the thickness of the ferrovanadium slag layer is generally greater than 400 mm), most of the metallic calcium has evaporated and volatilized before entering the molten iron for dephosphorization. Therefore, metal is used in actual production. It will be difficult to achieve the dephosphorization effect using calcium as a dephosphorization agent. The vanadium chemical plant used silicon-aluminum-calcium-barium alloy to conduct industrial dephosphorization tests in the original 1.5t electric furnace. The results showed that the phosphorus content of vanadium iron was: 0.064% and 0.068% respectively, proving that the reduction dephosphorization effect in the electrosilicothermal 50 ferrovanadium smelting is not effective. Significantly.

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