Recovery process for electroless plating baths

Details Recovery process for electroless plating baths Recovery process for electroless plating baths

1991-06-21

1992-05-12

Cintins, Ivars

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 127, 210667, 210670, 210688, 210726, 210912, B01D 1504

Patent

active

051123924

ABSTRACT:
A process for removing, from spent electroless metal plating bath solutions, accumulated byproducts and counter-ions that have deleterious effects on plating. The solution, or a portion thereof, is passed through a selected cation exchange resin bed in hydrogen form, the resin selected from strong acid cation exchangers and combinations of intermediate acid cation exchangers with strong acid cation exchangers. Sodium and nickel ions are sorbed in the selected cation exchanger, with little removal of other constituents. The remaining solution is subjected to sulfate removal through precipitation of calcium sulfate hemihydrate using, sequentially, CaO and then CaCO.sub.3. Phosphite removal from the solution is accomplished by the addition of MgO to form magnesium phosphite trihydrate. The washed precipitates of these steps can be safely discarded in nontoxic land fills, or used in various chemical industries. Finally, any remaining solution can be concentrated, adjusted for pH, and be ready for reuse. The plating metal can be removed from the exchanger with sulfuric acid or with the filtrate from the magnesium phosphite precipitation forming a sulfate of the plating metal for reuse. The process is illustrated as applied to processing electroless nickel plating baths.

REFERENCES:
patent: 4009101 (1977-02-01), Hayashi
patent: 4012318 (1977-03-01), Hayashi
patent: 4076618 (1978-02-01), Zeblisky
patent: 4303704 (1981-12-01), Courduvelis et al.
patent: 4664810 (1987-05-01), Matejka et al.
patent: 4666683 (1987-05-01), Brown et al.
patent: 4770788 (1988-09-01), Vignola
patent: 4789484 (1988-12-01), Ying et al.
patent: 4863612 (1989-09-01), Kirman et al.
patent: 4954265 (1990-09-01), Greenberg et al.
patent: 5002645 (1991-03-01), Eastland et al.

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