石煤酸浸提钒浸出液萃取试验研究

以湖北某地石煤为原料，对提钒酸浸液萃取过程的工艺技术参数进行了研究。结果表明：用Na₂SO₃对酸浸液进行预处理可以高效排除Fe³⁺对V⁴⁺萃取的影响，提高相同萃取级数下的萃取率；萃取适宜的萃原液pH=2，水相与有机相相比为3∶1，萃取时间为8 min，5级萃取下的总萃取率为99.29%；反萃适宜的有机相与水相相比为10∶1，反萃剂硫酸溶液的体积浓度为8%，8级反萃下的总萃取率为99.70%。

Experimental Study on Purification of Acid Leaching Solution of Stone Coal Extraction

With a stone coal in Hubei as raw material, the technical parameters in the extraction process of vanadium purification acid leaching solution were studied. The results indicated that with Na₂SO₃ used to pre-treat the acid leaching solution, the effect of Fe³⁺ and V⁴⁺ on the extraction was efficiently removed, and the extraction rate improved at the same extraction level. The total extraction rate at level 5 is 99.29% when Ph value for appropriate extraction is 2 and the ratio of organic phase and water phase is 3∶1 with the extraction time for 8 min; Total extraction rate at stripping level 8 reaches 99.70% when the suitable ratio of organic phase and water phase for stripping is 10∶1 and the volume concentration of the sulfuric acid solution as stripping agent is 8%.