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提出以季铵盐碱性萃取法从含钒钨酸铵溶液中深度除V并进行实验研究,考察了有机相组成、平衡水相pH值对萃取过程的影响以及相比对反萃过程的影响。绘制了萃取及反萃等温线并进行模拟逆流串级萃取及反萃实验。结果表明,将含微量钒的钨酸铵溶液先经蒸发脱氨预处理调整溶液pH值至8.7左右,再以组分(体积分数)为1%N263+5%仲辛醇+磺化煤油的有机相,在25℃、相比1.25∶1的条件下进行6级逆流串级萃取后,水相中V含量降至10mg/L以下,W的共萃损失<5%。负载有机相中的V可采用2mol/L NaOH溶液实现完全反萃,反萃后有机相可返回萃取工序连续使用。
In this paper, we propose a new method to extract V from vanadium-containing tungstate solution by quaternary ammonium basic extraction method. The effects of organic phase composition, equilibrium pH of aqueous solution on the extraction process, and the effect on stripping process . The extraction and stripping isotherms were drawn and simulated counter-current cascade extraction and stripping experiments were carried out. The results showed that the pH value of the solution containing vanadium tribasic acid was firstly pretreated by evaporation and deamination to adjust the solution pH value to about 8.7. Then, the components (volume fraction) of 1% N263 + 5% sec-octanol + sulfonated kerosene The organic phase was subjected to a 6-stage countercurrent cascade extraction at 25 ° C under a ratio of 1.25: 1. The V content in the aqueous phase was reduced below 10 mg / L, and the co-extraction loss of W was less than 5%. V in the loaded organic phase can be fully stripped with 2 mol / L NaOH solution, and the stripped organic phase can be returned to the extraction process for continuous use.