NOVELTY - Impurities in phosphoric acid are purified and recovered by preparing fluid film agent for removing fluorine ion impurity and metal cation impurity in phosphoric acid; using fluorine ion-removing fluid film agent to remove impurity in phosphoric acid; using cation-removing fluid film agent to remove cation impurity in phosphoric acid, and purifying phosphoric acid; and sending fluid film agent with fluorine ion impurity and fluid film agent with cation impurity to different towers, and recycling the cation-removed fluid film agent.    USE - Purification and recovering of impurities in phosphoric acid.    ADVANTAGE - The method enriches and recovers impurity element in phosphoric acid while purifying phosphoric acid.    DETAILED DESCRIPTION - Purification and recovering of impurities in phosphoric acid comprises:    (A) preparing fluid film agent for removing fluorine ion impurity in phosphoric acid, and/or preparing fluid film agent for removing metal cation impurity in phosphoric acid;    (B) sending fluid film agent for removing fluorine ion impurity in phosphoric acid and impure phosphoric acid into fluorine ion-removing tower to process removing reaction, and removing fluorine ion in phosphoric acid fully, or sending fluid film agent for removing metal cation impurity in phosphoric acid and impure phosphoric acid into cation-removing tower to process removing reaction, to remove metal cation in phosphoric acid fully;    (C) sending fluorine ion impurity-removed impure phosphoric acid and fluid film agent for removing metal cation impurity in phosphoric acid into cation-removing tower to process removing reaction, removing cation impurity in phosphoric acid fully to obtain purified phosphoric acid, or sending metal cation impurity-removed impure phosphoric acid and fluid film agent for removing fluorine ion impurity in phosphoric acid into fluorine ion-removing tower to process removing reaction, and removing fluorine ion impurity in phosphoric acid fully to obtain purified phosphoric acid;    (D) sending fluid film agent with fluorine ion impurity, which is leaded out from the fluorine ion-removing tower, to fluorine ion recovery tower to recover the fluorine ion carried by the fluid film agent, using the fluorine ion for preparing fluorine chemical and recycling the fluorine ion-removed fluid film agent;and    (E) sending fluid film agent with cation impurity, leading out from cation-removing tower to recover cation carried by the fluid film agent, using cation for preparing chemicals and recycling metal cation-removed fluid film agent.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic diagram of the purification and recovering impurities in phosphoric acid. (Drawing includes non-English language text).