Process for the Recovery of Gold from Anode Slimes

摘要

A process for the recovery of gold from a gold-bearing aqueous filtrate, the process comprising the steps of:
(A) Contacting the aqueous filtrate with dibutyl carbitol (DBC) in a two-stage solvent extraction process to remove the gold from the aqueous filtrate into the DBC to form a gold-loaded DBC; and(D) Contacting the gold-loaded DBC with an aqueous acid scrub of hydrochloric acid in a four-stage countercurrent scrub process to remove impurities, e.g., non-gold metal, from the DBC into the aqueous scrub solution to form an impurity-loaded aqueous scrub.;Each stage of the solvent extraction circuit and the aqueous acid scrub circuit is equipped with a mixing assembly and a phase separation tank in a head-tail arrangement such that the mixing assembly of one stage is adjacent to the phase separation tank of the adjacent stage.

主权项

1. An apparatus for the recovery of gold from a gold-bearing filtrate, the apparatus comprising:
(A) A two-stage solvent extraction (S.E.) circuit comprising:
(1) A first S.E. mixing assembly;(2) A first S.E. phase separation tank in fluid communication with the first S.E. mixing assembly;(3) A second S.E. mixing assembly in fluid communication with the first S.E. phase separation tank; and(4) A second S.E. phase separation lank in fluid communication with the S.E. second mixing assembly; and (B) A four-stage. acid scrub (A.S.) circuit comprising:
(1) A first A.S. mixing assembly;(2) A first A.S. phase separation tank in fluid communication with the first A.S. mixing assembly;(3) A second A.S. mixing assembly in fluid communication with the first A.S. phase separation tank;(4) A second A.S. phase separation tank in fluid communication with the A.S. second mixing assembly;(5) A third A.S. mixing assembly in fluid communication with the second A.S. phase separation tank;(6) A third A.S. phase separation tank in fluid communication with the second A.S. mixing assembly;(7) A fourth A.S. mixing assembly in fluid communication with the third A.S. phase separation tank; and(8) A fourth A.S. phase separation tank in fluid communication with the fourth A.S. mixing assembly;with the proviso that the second S.E. phase separation tank is in fluid communication with the first A.S. mixing assembly.