钒渣微波升温特性及氯化的研究

A study on temperature rising characteristics and chlorination of microwaved vanadium slag

为了研究微波熔盐氯化钒渣的可行性,在2.45 GHz频率下采用谐振腔微扰法测量钒渣的介电特性,并考察了不同物料的升温特性,研究了不同熔盐对钒渣氯化的影响。结果表明:常温下,粒径小于75μm的钒渣具有良好的吸波性能,而氯化物的吸波性能较差;钒渣升温速率与粒径大小呈负相关,而钒渣质量增加,升温速率会先增大后减小;AlCl3-NaCl-KCl熔盐对钒渣的氯化效果最强,强化氯化的机理可以描述为微波与熔盐的耦合更容易使矿相裂解,增加反应面积,增强氯化作用。

In order to study the feasibility of the chlorinated vanadium slag by microwave-assisted molten salt synthesis,the dielectric properties of vanadium slag were measured by cavity perturbation technique at 2.45 GHz.The temperature rising characteristic of different materials were investigated,and the effect of different molten salt on the chlorination of vanadium slag were studied.The results show that firstly,vanadium slag with particle size of less than 75滋m has good wave absorbing properties at room temperature,while chloride has poor wave absorbing properties.Secondly,the heating rate of vanadium slag is negatively correlated with the particle size.However,the heating rate of vanadium slag increases first and then decreases when the mass of vanadium slag increases..Thirdly,compared with other molten salt,AlCl3-NaCl-KCl shows the strongest chlorination effect on vanadium slag.The mechanism of enhanced chlorination can be described that the coupling of microwave and molten salt makes it easier to crack the mineral phase,which increases the reaction area and enhances chlorination.