云南湿法磷酸化学沉淀法脱氟研究

Research on the Defluorination of Wet-process Phosphoric Acid in Yunnan by Chemical Precipitation

采用化学沉淀法 ,用Na2 CO3,Na2 SO4和Na3PO4三种脱氟沉淀剂对云南湿法磷酸进行了脱氟研究 .发现Na3PO4在常温下 ,以化学计量的 1 .2倍的用量脱氟效果较好 ,脱氟率达 89.8% ,P2 O5 的收率达 82 .8% ,经脱氟的湿法磷酸的P/F为 1 0 2 .3。

The wet process phosphoric acid from Yunnan is defluorinated by the chemical precipitation with Na 2CO 3, Na 2SO 4 and Na 3PO 4 as defluorinated agent. It is observed that the defluorinated effect of Na 3PO 4 is better over others at the normal atmospheric temperature, and the rate of deflorination, the recovery rate of P 2O 5, and the P/F ratio of deflorinated acid are respectively up to 89.8% , 82.8% and 102.3, which meet the standard of phosphoric acid in the production of calcium phosphate for feed.