The V_2O_3 is used as raw material to smelt FeV80 alloy by means of electric aluminothermic process in the vanadium products factory of PanGang, resulting in serious corrosion of magnesia lining. In order to analyze the above issues, some lining samples were taken from the locations where the refractory contacts with molten slag after furnace cooling, and processed to conduct SEM analysis. The research results showed that the slag corrosion of magnesia lining proceeds mainly in form of dissolution, The solubility of MgO in molten slag increases from 3.3% to 41% with the increase of smelting temperature from 1900°C to 2200°C based on the phase diagram analysis. The corrosion rate of magnesia lining at temperature 2000°C, 2100°C, 2200°C are about 13, 22 and 33 times than that at temperature 1900°C, respectively. Therefore, to control the ferrovanadium processing temperature below 2000°C is conducive to prolong the service time of magnesia lining.
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