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金属矿山 ›› 2017, Vol. 46 ›› Issue (05): 99-103.

• 矿物工程 • 上一篇    下一篇

高浓度盐酸体系下叔胺N235三相萃取钒试验

谌纯1,张一敏1,2,3,黄晶2,3,包申旭1,2,杨晓1   

  1. 1.武汉理工大学资源与环境工程学院,湖北 武汉 430070;2.钒资源高效利用湖北省协同创新中心,湖北 武汉 430070;3.武汉科技大学资源与环境工程学院,湖北 武汉 430081
  • 出版日期:2017-05-15 发布日期:2017-10-18
  • 基金资助:

    国家自然科学基金项目(编号:51404177),国家重点科技支撑项目(编号:2015BAB03B05)。

Third-phase Extraction of Vanadium by Tertiary Amine N235 in High Concentration of Hydrochloric Acid System

Shen Chun1,Zhang Yimin1,2,3,Huang Jing2,3,Bao Shenxu1,2,Yang Xiao1   

  1. 1.College of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;2.Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources,Wuhan 430070,China;3.School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China
  • Online:2017-05-15 Published:2017-10-18

摘要: 含钒石煤经盐酸浸出后所得浸出液通常酸度较高,pH较低。为在不调节浸出液pH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2 min,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(R3NH)4·(H2O)n·H2V10O28·(HCl)x;萃原液盐酸浓度<3.1 mol/L时,萃合物结构为(R3NH)4·(H2O)n·H2V10O28

关键词: 钒, 盐酸体系, N235, 三相, 溶剂萃取, 分离

Abstract: The stone coal acidic leaching solution after hydrochloric acid leaching process usuallyhas high acidity and pH is relatively low.For investigating the best extraction parameters of vanadium(V) from the high concentration of hydrochloric acid/vanadium system with tertiary amine N235 as extractant without adjusting the acidic leaching solution pH,three-phase extraction process was studied,the effects of the extractant composition,HCl concentration in feed,extraction phase O/A ratio and extraction time on vanadium extraction efficiency were studied,and the structure of extracted complex in the process of recovering vanadium with N235 in different hydrochloric acid concentrations was analyzed with FT-IR.The results showed that V extraction efficiency after one-stage extraction was 83.93% under the optimum condition of HCl concentration in feed of 2 mol/L,feed simulation solution containing 1.82 g/L vanadium(V)organic phase N235 concentration in volume is 20%,extraction temperature is 25 ℃,O/A phase ratio of 0.5,and extraction duration of 2 min,extraction efficiency for three-stage counter-current extraction was 98.37%.Meanwhile,when tertiary amine N235 was used to recover vanadium from hydrochloric acid medium,the three-phase was always formed.When hydrochloric acid concentration in feed was more than 3.1 mol/L,structure of extracted complex was (R3NH)4·(H2O)n·H2V10O28·(HCl)x,otherwise,the structure of extracted complex was (R3NH)4·(H2O)n·H2V10O28.

Key words: Vanadium, Hydrochloric acid system, N235, Third-phase, Solvent extraction, Separation