协同萃取净化湿法磷酸中镁离子的研究

Study of Magnesium Ions in Purified Wet-Process Phosphoric Acid by Synergic Extraction

以质量分数39%的湿法磷酸为研究对象,采用酸-酯复合萃取剂及酯-酯复合萃取剂对湿法磷酸中的镁离子进行净化研究。研究结果表明:在酸性萃取剂二壬基萘磺酸(DNNSA)含量固定的情况下,磷酯类萃取剂磷酸二异辛酯(P204)在一定范围内产生正协同作用;在磷酯类萃取剂PS含量固定时,添加P204可完全产生正协同作用,且PS与P204复合萃取剂的协同萃取效果优于DNNSA与P204复合萃取剂的协同萃取效果;当PS质量分数为62.20%、P204质量分数为7.17%时,镁离子的萃取率最高,可达57.4%。

Taking wet-process phosphoric acid of mass fraction of 39% as research object, adopting acid-ester composite extractant and ester-ester composite extractant, the study of purification of magnesium ions in wet-process phosphoric acid is carried out. Research results show that under condition of fixed content of acidic extraetant of dinonylnaphthalene sulfonic acid （DNNSA）, phosphonate ester extraetant of D2EDPA （P204） produces positive synergistic effect within certain limits; when content of phosphonate ester extractant PS is fixed, adding P204 produces fully positive synergistic effect, and the synergistic effect of PS and P204 composite extractant is superior to that of DNNSA and P204 composite extractant; when mass fraction of PS is 62.20% and that of P204 is 7. 1% , the magnesium ion extraction rate is the highest, reaching 57.4%.