从含钒石煤燃烧灰渣浸出液中萃取钒的实验研究

针对陕西某地低热值含钒石煤燃烧灰渣的硫酸浸出液, 采用溶剂萃取法除杂并富集钒。结果表明:浸出液经中和还原处理后, 采用12.5% P₂₀₄+5% TBP+82.5%磺化煤油进行4级逆流萃取, 相比(O/A)为2, 萃原液pH值为2, 振荡时间为2 min, 静置1 min, 钒萃取率可达到99.31%。采用4级逆流反萃, 反萃剂硫酸1.5 mol/L, 相比(O/A)为4, 振荡4 min, 静置1 min, 钒反萃率为96.94%。

Experimental Study on Extraction of Vanadium from Low Calorific Value Coal Ash Leaching Liquid

Stone coal vanadium always exists in the complex form and there are regional differences in the process of extraction of vanadium. As for the sulfuric acid leaching liquid of low-calorific value vanadium-containing stone coal ash, the process of solvent extraction was adopted to enrich vanadium and remove the impurities from the leaching liquid. The leaching liquid was firstly subjected to a neutralizing reduction process, followed by 4-stage countercurrent extraction with 12.5% P₂₀₄+5% TBP+82.5% sulfonated kerosene, with phase ratio(O/A) at 2, initial pH value of extraction at 2, 2-min mixing and 1-min settling, resulting in vanadium extraction rate at 99.31%. While the subsequent 4-stage countercurrent stripping with 1.5 mol/L sulfuric acid, phase ratio (O/A) at 4, 4-min mixing and 1-min settling, can result in the stripping yield of vanadium up to 96.94%.