| 摘要 |
RECOVERY OF GOLD ALKALINE CYANIDE LEACH SOLUTIONS USING ION EXCHANGE ADSORBENTS, COMPRISING (A) CONTACTING THE CYANIDE LEACH SOLUTION CONTAINING THE GOLD WITH AN EXTRACTION REAGENT COMPRISED OF A SOLID ADSORBENT CARRYING AN ORGANIC BASE FUNCTIONALITY OF A COMPOUND HAVING A PKA BETWEEN ABOUT 9-14, SUCH AS A GUANIDYL FUNCTIONALLY, TO ADSORB GOLD AND ELUTING THE ADSORBED GOLD FROM THE SOLID ADSORBENT WITH AN AQUEOUS ALKALINE ELUANT SOLUTION HAVING A PH ABOVE ABOUT 12 AND CONTAINING AN ALKALI METAL SALT OF AN AROMATIC OR ALIPHATIC CARBOXYLIC ACID HAVING FROM ABOUT 4-14 CARBON ATOMS, THE ELUANT SOLUTION HAVING INCORPRATED THEREIN FROM ABOUT 0.001 MOLES TO ABOUT 0.2 MOLES PER LITER OF AN ALKALI METAL CYANIDE SALT. THE SOLID ADSORBENT CONTAINING THE AUROCYANIDE COMPLEX MAY BE CONTACTED WITH A CONCENTRATED AQUEOUS SOLUTION OF A ZINC TETRACYANIDE SALT WHEREBY THE AUROCYANIDE COMPLEX IS DISPLACED WITH A ZINC TETRACYANIDE COMPLEX BEFORE TREATMENT WITH THE ELUANT SOLUTION. |
