Remove of heavy metals from their solutions by mineral Zeolite

The most common process for production of phosphoric acid in the World, is wet process phosphoric acid (WPPA). Because the acid is produces from this process in the production of industrial grade and food grade contains many impurities, must be purified. Therefore, the purification process contains coagulation, discoloration with charcoal, sulfate precipitation, filtration, extraction with solvent and ion exchange process. Florine is eliminated by precipitation in the form sodium flour silicate. Arsenic is precipitated in form of cupper arsenide. Lead, iron and aluminous is precipitated by glacial acetic acid. Sulfate is precipitated by barium soluble salt.The selective solvent is used for extraction is three n-butyl phosphate (TBP). The result is obtained in laboratory is in accord with the above process.