带分散网的屈尼塔的萃取实验研究

Experimental extraction study of Kühni column with dispersed network

将微分散技术运用于萃取工艺,设计出带分散网的屈尼萃取塔实验装置。以水/粗磷酸/TBP+煤油为实验体系,研究该装置在湿法磷酸萃取净化过程中的应用,考察了转速、停留时间、相比对萃取和反萃过程的影响。实验得到最佳萃取工艺条件:转速为250 r/min、停留时间为20 min、相比为4∶1。在此条件下,磷酸萃取率为46.84%,萃取速率为0.281 5 g/s,全塔效率为25%,塔的理论当量高度为0.24 m。在最佳萃取和反萃操作条件下,磷酸的有效利用率为36.57%,Fe2+、F-、SO42-等3种杂质离子的去除率较高,均在95%以上。

Micro-dispersion technology was used in the extraction process, and Ktlhni extraction column with the dispersed network was designed.Water/crude phosphoric acid/TBP＋kerosene was used as the experimental system to study the wet-pro- cess phosphoric acid （WPA） purification process.Effects of rotational speed, residence time, and phase ratio on the extraction and stripping process were investigated.Experimental results showed that the optimum extraction conditions were the rotation- alspeed of 250 r/min,residence time of 20 min,and phase ratio of 4：1 ,and the extraction rate of phosphoric acid was 46.84%, the velocity of phosphate extraction was 0.281 5 g/s, the efficiency of the whole column was 25 %, and theoretical equivalent of the column height was 0.24 m.Under the best operating conditions of the extraction and stripping,the effective utilization of H3PO4 was 36.57%, and the removal rate of Fe2, F-, and SO42- were all more than 95%.