Study On Reduction Of Vanadium Titano-magnetite With Carbon By Microwave Heating

The resource of vanadium titano-magnetite is abundant in China. The present process of vanadium titano-magnetite can not make full use of it and lead to waste of titanium resource. In order to obtain a new way to make full use of vanadium titano-magnetite, the mixture of vanadium titano-magnetite and coal powder was heated by microwave to acquire the reduction characteristic. The conclusions of this work are as fellows:Temperature has important influence on the reduction degree of vanadium titano-magnetite and the composition of the reduction product. When the reduction temperature is 1300℃, the reduction product contains Fe, Fe3O4, FeTiO₃ and Fe₂TiO₅。When the reduction temperature is 1400℃, the reduction product contains Fe, Fe3O4, FeTiO₃, MgTiO₃, Fe₂TiO₅, TiO₂, MgAl₂O₄. When the reduction temperature is 1500℃, the slag and the metal separate. The metal is Fe—V alloy. The slag contains FeTiO₃, MgTiO₃, Fe₂TiO₅, Ti₃O₅, MgAl₂O₄, FeO.The addition of CaO to the vanadium titano-magnetite can make the reduction of FeTiO₃ and 2FeO.TiO₂ easily and the separation of slag and iron. The separation of the slag and metal becomes weaken because the microwave absorbancy of the mixture drops off if the addition of CaO is excessive. The results indicate that the reduction is better when the basicity is 1.2, 1.4, 1.6.When the addition of carbon to vanadium itano-magnetite is excessive, the excessive carbon will effect the reduction atmosphere and there is surplus of carbon after the completion of reduction, the surplus carbon covering the reduction production can insulates the production and keep the temperature. The experimental results indicate that there is surplus of carbon and the reduction is better when the addition of carbon is above 26%.When the microwave power is unchanged, the temperature and time is a function of 2. The heating rate decreases with time. The microwave oven pressure increases with time becase the gas production increases and the volume inflates.Under the experimental condition, when the reduction temperature is 1500℃, the carbon content is 29.9%, the basicity is natural, the initial pressure is 0.6atm, the reduction is the best.