Process for the removal of heavy metal ions, especially ions of cadmium, Copper, Lead and Mercury, from Wet process Phosphoric acid.

摘要

Process for the removal of heavy metal ions, especially ions of cadmium, Copper, Lead and mercury from Phosphoric Acid obtained by discretisation of phosphate ore with sulfuric acid and subsequent separation of Calcium sulfate formed.It consists of putting in contact with a Crude Phosphoric Acid adsorbent and an ester of an Acid or diorganilditiofosforico Deal first with the Phosphoric acid ester and a Gross after the treatment with the adsorbent. Phosphoric acid ester obtained is separated and Purified of the adsorbent.Using Activated Carbon as adsorbent, Carbon Black, Porous Resins or silicates.