磷酸三丁酯萃取净化盐酸法湿法磷酸的工艺研究

以磷酸三丁酯为萃取剂对湿法磷酸采用溶剂萃取法进行净化,探索了萃取工艺条件.得出该萃取体系对湿法磷酸较为适宜的萃取工艺条件为：在室温下进行萃取,萃取相比为4,盐酸加入量为原料磷酸的6％,此时P205萃取率为62.9％.净化后的稀磷酸通过浓缩、除杂、脱色后得到w（H3PO4）85％食品级磷酸产品.

Study on purification process of WPA with hydrochloric acid by tributyl phosphate

With the tributyl phosphate as extractant, the WPA is purified by solvent extraction method, the process conditions of extraction are studied. The optimum process conditions of extraction are considered that： extracting at room temperature, the ratio of extraction phase of 4, the hydrochloric acid dosage taking 6% of WPA mass. With the optimum process conditions, the recovery rate of P205 is 62.9%, the product dilute phosphoric acid can be used to produce w（H3PO4） 85% food grade phosphoric acid by concentration, impurity and decoloration.