Method for recycling iron ions and preparing iron(iii) phosphate

A method for recycling iron ions and preparing iron(III) phosphate, comprising the following steps:

• Step (a):
• Providing an iron ion-containing solution, wherein, the iron ion-containing solution comprises an iron chloride solution, an iron sulfate solution or a combination thereof,
• Step (b):
• Passing the iron ion-containing solution through a chelating cation exchange resin capable of adsorbing ferric ions to obtain an ion-adsorbed resin and a first eluate;
• Step (c):
• Passing a phosphoric acid solution through the ion-adsorbed resin to desorb ferric ions, thereby obtaining an ion-desorbed resin and a second eluate, wherein the second eluate comprises ferric ions and phosphate ions, and the phosphoric acid solution has a concentration ranging from 10 weight percent to 45 weight percent;
• and
• Step (d):
• Heating the second eluate to obtain a third solution, wherein the third solution comprises an iron(III) phosphate precipitate.