微孔分散轮盘塔净化湿法磷酸的实验研究

Study on Purifying Wet-process Phosphoric Acid by Micropore Dispersion Rotating Impeller Column

在设计的新型微孔分散轮盘塔中,采用微孔分散技术对萃取过程进行强化传质,以磷酸/水/TBP+煤油为实验体系,研究了该萃取设备净化湿法磷酸的萃取特性。考察了孔径为75μm的微孔网分散轮盘在不同相比、转速、停留时间下对萃取率和反萃取率的影响,并在不同转速下与普通转盘塔进行了对比,结果表明:微分散轮盘比普通转盘有较好的分散效果,其中转速对其有明显影响;萃取的适宜条件为转速250 r min 1,相比4:1,停留时间10 min,磷酸萃取率可达54.92%;当转速250 r min 1,相比为6,停留时间15 min,磷酸反萃率可达85.33%。

The micropore dispersion technique was used to enhance the mass transfer of the solvent extraction,and a new type of micropore dispersion rotating impeller column was designed for the extraction of phosphoric acid from wet-process phosphoric acid.The extraction characteristic was studied with water/phosphoric aid/TBP ＋ kerosene as the experimental system in a micropore dispersion rotating disc column with membrane having holes of 75μm diameter as dispersion device.The effects of phase ratio,residence time and rotational speed on the extraction and reverse extraction efficiencies were investigated.The experimental results indicate that,comparing with the normal disc,the micropore dispersion impeller shows better dispersion performance.The influence of rotational speed of the micropore dispersion impeller on the dispersion performance is obvious,and when the phase ratio is 4：1,the residence time is 10 min and the rotational speed is 250 r·min-1,the extract efficiency of phosphoric acid can reach about 54.92%.For the reverse extraction,when the phase ratio is 6：1,the residence time is 15 min and the rotational speed is 250 r·min-1,the reverse extract efficiency can reach about 85.33%.