During the purification of wet-process phosphoric acid(WPA) by solvent extraction,the colored organic impurities in WPA would react with the solvent and interfere the extraction process.

• 在采用溶剂萃取法净化湿法磷酸时,磷酸中的有色杂质会与萃取剂作用,干扰萃取过程,因此有必要事先对磷酸进行脱色处理。