Different types of acidic extractants (Cyanex 272, Cyanex 302, and D2EHPA) were examined in terms of their capability and selectivity in extracting metals from real photographic wastes. It was found that an extractant containing a P=S functional group (Cyanex 302) strongly extracts silver over an equilibrium pH range of between 6 to 9. It also shows high selectivity for silver over other metals that exist in real photographic waste compared to the other two extractants. Cyanex 272 and D2EHPA also provide a good metal extraction performance at pH 7 and 8.3 respectively but they are only selective to iron at pH 9. The extraction capacity increases with increasing extractant concentration until it achieves a plateau due to the presence of excess of free extractant.
|Number of pages||8|
|Journal||Solvent Extraction Research and Development|
|Publication status||Published - Dec 1 2005|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)