PROCEDURE FOR THE ELIMINATION OF HEAVY METAL IONS, ESPECIALLY OF IONS OF CADMIUM, COPPER, LEAD AND MERCURY, FROM THE PHOSPHORIC ACID OF WET PROCEDURE.

摘要

The disclosure relates to process for removing heavy metal ions, especially cadmium, copper, lead and mercury ions from wet-processed phosphoric acid. To this end, the crude acid is contacted with a mixture consisting of an adsorbent and a diorganyldithiophosphoric acid ester or, after treatment with the ester, the acid is contacted with the adsorbent alone, and the purified phosphoric acid is ultimately separated from the ester and adsorbent.