高浓度盐酸体系下叔胺N235三相萃取钒试验

发布时间：2018-07-27 14:56

【摘要】：含钒石煤经盐酸浸出后所得浸出液通常酸度较高,p H较低。为在不调节浸出液p H的条件下,以叔胺N235为萃取剂从高浓度盐酸—钒体系中萃取钒的最佳工艺,考察了萃取剂的组成、萃原液盐酸浓度、萃取相比(O/A)、萃取时间对钒萃取率的影响,并通过FT-IR分析探讨了在不同盐酸浓度下N235萃取钒形成的萃合物结构。试验结果表明:对盐酸浓度为2 mol/L,钒浓度为1.82 g/L的模拟酸浸液,在有机相N235体积浓度为20%,萃取时间为2min,萃取温度为25℃,相比(O/A)为0.5情况下的钒单级萃取率为83.93%,三级逆流萃取钒总萃取率为98.37%。利用叔胺N235从盐酸介质中萃取钒时,均会出现三相。在萃原液盐酸浓度≥3.1 mol/L时,萃合物结构为(R_3NH)_4·(H_2O)_n·H_2V_(10)O_(28·)(HCl)x;萃原液盐酸浓度3.1 mol/L时,萃合物结构为(R_3NH)_4·(H_2O)_n·H_2V_(10)O_(28)。
[Abstract]:The leaching solution of vanadium bearing stone coal after hydrochloric acid leaching usually has higher acidity and lower pH. In order to extract vanadium from high concentration hydrochloric acid vanadium system with tertiary amine N235 as extractant, the composition of extractant and the concentration of hydrochloric acid in extraction solution were investigated. The effect of extraction time on the extraction rate of vanadium was compared (O / A). The structure of the extraction complex formed by the extraction of vanadium N235 at different concentrations of hydrochloric acid was investigated by FT-IR. The results showed that the simulated acid leaching solution with 2 mol / L hydrochloric acid concentration and 1.82 g / L vanadium concentration was extracted at 25 鈩，

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