Extraction and recovery of precious metals from plating solutions using molecular recognition technology

Citation
N. Ezawa et al., Extraction and recovery of precious metals from plating solutions using molecular recognition technology, T I MET FIN, 78, 2000, pp. 238-242
Citations number
16
Categorie Soggetti
Metallurgy
Journal title
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
ISSN journal
00202967 → ACNP
Volume
78
Year of publication
2000
Part
6
Pages
238 - 242
Database
ISI
SICI code
0020-2967(200011)78:<238:EAROPM>2.0.ZU;2-5
Abstract
Conventional techniques for recovery of gold from dragout, plating, or stri pping solutions, produce a gold product that must first be refined, and the n converted back into potassium gold cyanide (PGC) fore re-use. This proced ure results in subsequent refining and conversion charges. With the molecul ar recognition technology (MRT) process, the gold can be directly extracted and converted to the form of potassium gold cyanide, resulting in substant ial savings through elimination of the various costs and controls associate d with gold refining. The recovered gold does not have to be remanufactured in the form of PGC, and can be quickly recycled. The PGC is deposited on t he SuperLib(R) resin material, and can then be readily stripped into a conc entrated aqueous solution for recycling. Results of tests on a commercial g old electroplating line are presented. Results of work conducted on recover y of palladium from a dipping bath of palladium/tin chloride catalyst solut ion are also reviewed.