Microwave roasting-acidic leaching technique for extraction of vanadium from stone coal
Microwave roasting-acidic leaching technique for extraction of vanadium from stone coal
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发表时间：
2011
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通讯作者：
Xi Xiao-guang
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作者：
Xi Xiao-guang
与传统的焙烧-酸浸工艺和原石煤酸浸工艺相比，开发了微波焙烧-酸浸石煤提钒工艺，并考察了H2SO4用量和浸出时间对提钒的影响。结果表明，测试样品在700 ℃（不加任何添加剂）微波焙烧60 ℃时，V2O5的浸出率高达83.5%。 min，硫酸用量为90℃浸出V2O5的22%，在相同浸出条件下，浸出率比原石煤常规焙烧或酸浸提高了30%左右。通过对焙烧样和原石煤中V2O5和Al2O3的浸出，发现V2O5和Al2O3的浸出率呈正相关关系。结合矿物晶相和微波焙烧特点,探讨了微波焙烧提高V2O5浸出率的机理。结果表明,微波焙烧引起的矿物晶相破坏是影响V2O5浸出率提高的关键因素。
Compared with the conventional roasting-acidic leaching procedure and acidic leaching process of raw stone coal,the microwave roasting-acidic leaching technique for extraction of vanadium from stone coal was developed,and the effects of H2SO4 dosage and leaching time on vanadium extraction were investigated.The results show that the leaching rate of V2O5 reaches up to 83.5% when the tested sample is microwave roasted(without any additive) at 700 ℃ for 60 min,the dosage of sulfuric acid is 22% of V2O5 leaching at 90 ℃.The leaching rate is improved by about 30%,more than that obtained from the conventional roasting or acidic leaching of raw stone coal under the same leaching conditions.The positive correlation between the leaching rate of V2O5 and Al2O3 is found out by leaching V2O5 and Al2O3 from both the roasted samples and raw stone coal.Based on the minerals crystal constitution and the characteristics of microwave roast,the mechanism on improving the leaching rate of V2O5 by microwave roasting was discussed.It is indicated that the breakage of the minerals crystal constitution resulted from microwave roasting is the key factor of affecting the improvement of V2O5 leaching rate.