微波干燥和焙烧球团矿

Microwave Drying and Roasting Pellets

使用１４００／８５０Ｗ的微波炉，在实验室研究了微波加热磁铁矿球团时球团矿的温度变化规律、干燥特点、生球强度和焙烧后球团的岩相特征，并对固结机理进行了探讨。结果表明，和普通干燥焙烧方法相比，微波法干燥焙烧球团矿温度上升迅速且内部温度分布均匀；干燥速度很快，干燥过程中不出现裂纹和爆裂现象；焙烧后的磁性球团矿主要由连晶充分的Ｆｅ_２Ｏ_３组成；每个成品球的强度为１７０～２３０ｋｇ；焙烧时不会出现过热．

A microwave oven of 1400/850 W was used for drying and roasting of pellets.In experiment,the microwave heating rate,drying process and the mineralogical analysis for pellets were investigated. The results show that under microwave radiation the temperature of pellets increases rapidly and the temperature distribution inside the pellets is very uniform compared with the conventional heatly process.The drying rate is also very fast without crack and burst in pellet. The mineralogical phase of the roasted pellets is hematite oxidized from magnetite. The strength of aroasted pellets ranged 170～230kg.