铌精矿微波碳热还原反应动力学

Reaction Kinetics of Niobium Concentrate Microwave Carbothermal Reduction

针对白云鄂博铌精矿利用工艺的成本高、过程复杂、能耗大的特点,引入微波场,考察温度对铌精矿还原的影响,并对其进行形貌及动力学分析。结果表明,微波场中铌精矿碳热还原反应机理属于三维扩散,动力学方程为y=1-(2/3)α-(1-α)^(2/3),表观活化能E_(a)=131.654 kJ/mol,微波加热相对于常规加热具有加快反应速率、降低反应活化能的效果。

Aiming at the characteristics of high cost,complex process and large energy consumption of Bayan Obo niobium concentrate utilization process,microwave field was introduced in this study,and effects of temperatures on reduction of niobium concentrate were investigated,and its morphology and kinetic analysis were analyzed.The results show that carbothermal reduction reaction mechanism of niobium concentrate in microwave field belongs to three-dimensional diffusion,the kinetics equation is y=1-(2/3)α-(1-α)^(2/3),and the apparent activation energy is E_(a)=131.654 kJ/mol.Compared with conventional heating,microwave heating has the effect of accelerating reaction rate and reducing activation energy.