FREMGANGSMAATE FOR BEHANDLING AV TUNGMETALLHOLDIGE RESTER FRA RENSING AV RAAFOSFORSYRER

摘要

Residue obtained upon the removal of heavy metal contaminants from crude phosphoric acid by means of a dialkyldithiophosphoric acid ester and adsorbent is worked up into ecologically reliable solid matter and into a heavy metal concentrate. The solid matter and heavy metal concentrate are separated from one another by successive mechanical and chemical treatment. The sequential order of these two operational steps can be inversed.