含钒石煤微波焙烧提钒试验研究

Effect of Microwave Roasting on Vanadium Extraction from Stone Coal

以某含钒石煤为原料进行微波焙烧提钒研究,并与常规焙烧提钒进行对比,主要考察微波焙烧温度、微波焙烧时间、硫酸体积浓度、浸出时间、液固比、浸出温度对钒浸出率的影响。结果表明,在微波焙烧温度550℃、焙烧时间20min、硫酸体积浓度15%、浸出时间6h、液固比1.5∶1(mL/g)、浸出温度95℃的条件下,钒浸出率为86.64%,在相同浸出条件下,常规马弗炉700℃焙烧1h钒的浸出率为84.22%。微波焙烧相对常规焙烧能在更低温度、更短时间内达到相同的提钒效果。

A stone coal was roasted by microwave.The result was compared to that of conventional roasting in process of vanadium extraction from stone coal.The effects of microwave roasting temperature and time,concentration of sulfuric acid,leaching time and temperature,and ratio of liquid to solid（L/S）on vanadium leaching rate were investigated.The results show that the leaching rate of V2O5 is 86.64%under the optimum conditions including roasting temperature of 550 ℃,roasting time of 20 min,volume concentration of sulfuric acid of 15%,leaching time of 6h,L/S=1.5/1（mL/g）,and leaching temperature of 95 ℃.When the sample is roasted at 700 ℃for 1hin conventional muffle furnace,vanadium leaching rate is 84.22%.Microwave roasting have the advantages of lower roasting temperature and shorter roasting time compared with conventional roasting.