摘要
采用加盐萃取法从高酸浸出液中直接分离富集钒,考察了酸度、N235浓度、氯化钠浓度、硫酸钠浓度对N235萃取分离高浓度硫酸溶液中钒的影响,并确定了萃合物的结构。结果表明,Cl^-和SO_4^(2-)对硫酸体系钒的萃取均有一定提高,但Cl^-的作用效果更显著。在不加盐的条件下,采用20%N235为萃取剂,磺化煤油为稀释剂,硫酸浓度1mol/L,萃取时间10min,相比A/O=1∶1,经单级萃取,硫酸体系中钒萃取率仅为30%左右;加入一定量的NaCl、Na_2SO_4后,钒萃取率分别达到80%、47%。Cl-作用于硫酸体系时,与钒以离子缔和形式形成萃合物(R_3N)_x·(VO_2^+·Cl^-)_y;SO_4^(2-)的加入可促进VO_2SO_4^-的形成,使萃取率提高。
Vanadium was extracted from high-acidity leaching solution of stone coal with N235 and addition of inorganic salt.The effects of acidity,and concentration of N235,NaCl,and Na2SO4 on vanadium extraction efficiency in high concentrated H2SO4 solution were investigated.The structure of extracted complex was determined.The results show that vanadium extraction efficiency can be promoted by Cl^-and SO4^2-in concentrated H2SO4 solution.After one-stage extraction under the conditions including 20% N235,initial sulfuric acid concentration of 1 mol/L,extraction time of 10 min,and phase ratio A/O=1,only 30% of vanadium is extracted in H2SO4 system while adding a certain amount of NaCl and Na2SO4 raises vanadium extraction rate to80%and 47%respectively.NaCl has bigger effect to direct extract vanadium from concentrated H2SO4 solution with production of（R3N）x·（VO2^＋·Cl^-）yin form of ion association.Vanadium extraction efficiency rises with increase of·VO2SO4^-concentration when SO4^2-concentration is improved.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2017年第2期36-39,58,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
国家科技支撑计划项目(2015BAB03B05)
国家自然科学基金资助项目(51404174)
