Method for recovery of a metal ion from electroless plating solu

Details Method for recovery of a metal ion from electroless plating solu Method for recovery of a metal ion from electroless plating solu

1989-11-28

1992-04-28

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210669, 210688, 423 24, 423139, 423DIG14, B01D 1504

Patent

active

051086158

ABSTRACT:
A new process for removal of a metal ion from an anionic complex, including a first chelating agent and a metal ion, such as copper, nickel or cobalt ion, in electroless plating bath rinse streams utilizes a cation exchange resin to extract the metal ion from the rinse stream after the metal ion has been removed from the anionic complex and complexed with a second chelating agent.
In another embodiment, a competing chelating agent is not added to the electroless plating bath waste stream, but rather, another metal ion (B), which has a higher affinity for the chelating agent than the metal ion (A) of interest and which is nontoxic, is added to the waste stream. Metal ion B is selected so that under predetermined conditions, metal ion B forms a stronger complex with the chelating agent than does metal ion A. Also, the complex of the chelating agent and nontoxic metal ion B is anionic. A cation exchange resin is used to extract metal ion A from the treated waste stream.

REFERENCES:
patent: 4076618 (1978-02-01), Zeblisky
patent: 4303704 (1981-12-01), Courduvelis et al.
patent: 4666683 (1987-05-01), Brown et al.
patent: 4778572 (1988-10-01), Brown
Clyde S. Brooks, "Metal Recovery From Electroless Plating Wastes," Metal Finishing, vol. 87, No. 5, pp. 33-36 (1989).

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