炉渣二元碱度对钒钛磁铁矿预还原团块熔分行为的影响OA

Based on thermodynamics,process mineralogy and thermal experiments,the effects of binary basicity of slag R2[i.e.w(CaO)/w(SiO2)]on the smelting behavior of vanadium-titanium magnetite pre-reduced pellets have been systematically studied.The results of FactSage thermodynamic calculation show that increasing R2 can reduce the Ti content in molten pig iron,while having little effect on the temperature and amount of Fe and V formation.Combining the thermal experiments results and process mineralogy theory,it can be concluded that when R2 increases from 0.43 to 0.8,the recovery rates of Fe and V in the molten pig iron increase from 97.07％and 82.31％to 98.89％and 89.48％,respectively;The recovery rate of TiO2 in the molten slag increases from 93.67％to 95.21％.The formation of low melting phases reduces the degree of inclusions in the ferroalloy phase,promotes the directional migration of valuable elements,and thus improves the slag iron separation effect.When R2 is higher than 0.8,its impact on the recovery rate of valuable components is relatively small.The formation of high melting point perovskite increases the melting point,viscosity,and slag amount of the molten slag phase,thereby increasing the cost and energy consumption of EAF.