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按未反应核心模型及理想置换型移动床气固反应原理,分别推导了单颗钒钛磁铁矿球团和还原竖炉内钒钛矿料粒的反应速度式。以多种文献报道的实验数据计算了钒钛矿球团还原过程的传质系数k_1、k、D_e。在竖炉还原的实际条件下,还原总速度受内扩散影响最大而与气膜扩散无关。对竖炉还原钒钛磁铁矿的主要动力学参数进行了讨论。
According to the unreacted core model and the ideal displacement moving bed gas-solid reaction principle, the reaction velocity formulas of single vanadium-titanium magnetite pellets and vanadium-titanium pellets in the reduction shaft were deduced respectively. The mass transfer coefficients k_1, k, D_e of the vanadinite pellets were calculated based on a variety of experimental data reported in the literature. Under the actual conditions of the shaft furnace reduction, the total reduction speed is affected most by the inner diffusion but not by the diffusion of the gas film. The main kinetic parameters of vanadium-titanium magnetite reduced by shaft furnace were discussed.