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研究微波功率及物料量对钛精矿微波干燥的含水率、脱水速率、水分比等干燥特性的影响。实验微波功率范围为119～700W,物料量为5～25g。不同的干燥条件下干燥过程均延续2～8min。研究发现微波功率密度对含水率和干燥速率的影响较大,所有干燥过程都有一个明显的特征,即在初始阶段有加速干燥峰。固定物料量为25g和微波功率为385W时,分别对钛精矿的微波干燥动力学进行研究。结果表明:相对于Page半经验模型,干燥过程更符合Henderson-Pabis指数模型。干燥速率常数随着微波功率的增加和物料量的减少而增加。
The effects of microwave power and amount of material on the drying characteristics of titanium concentrate microwave drying, such as water content, dehydration rate and moisture content, were studied. Experimental microwave power range of 119 ~ 700W, the amount of material is 5 ~ 25g. The drying process under different drying conditions are extended 2 ~ 8min. It is found that the microwave power density has a great influence on the water content and the drying rate. All the drying processes have the obvious feature of accelerating the drying peak in the initial stage. When the amount of fixed material was 25g and the microwave power was 385W, the microwave drying kinetics of titanium concentrate were studied respectively. The results show that the drying process is more consistent with the Henderson-Pabis index model than the Page semi-empirical model. The drying rate constant increases with microwave power and material volume.