微波焙烧对石煤提钒的影响

Effect of microwave roasting on vanadium extraction from stone coal

通过微波焙烧与传统焙烧后的对比实验,考察焙烧温度、焙烧时间和添加剂用量对石煤提钒的影响。结果表明,微波焙烧温度为700℃、焙烧60 min、添加剂(Na2CO3)用量为矿样质量的6%时,V2O5浸出率达到64.1%以上;经微波700℃焙烧120 min,矿样中小于0.074 mm粒级的含量提高10.0%左右。根据微波焙烧前后矿样粒度的变化,提出了微波焙烧过程矿样裂解模型,用此模型可以解释微波焙烧能够提高石煤中V2O5浸出率的原因。

Comparison tests of microwave roasting and conventional roasting for stone coal were carried out to investigate the effects of roasting temperature, roasting time and roasting additive dosage on vanadium extraction. The results show that V2O5 leaching rate is more than 64.1% when the test sample is roasted by microwave at 700 ℃ for 60 min, with additive Na2CO3 dosage of 6%. The size analysis indicates that the size fraction of 〈0.074 mm particles increases more than 10.0% after the sample is roasted by microwave at 700 ℃ for 120 min. A disruption model of sample in microwave roasting process was suggested, by which the reason for the improvement of V2O5 leaching rate can be explained.