Solder stripper recycle and reuse

Details Solder stripper recycle and reuse Solder stripper recycle and reuse

1995-05-23

1996-04-09

Le, Hoa Van

Compositions

Etching or brightening compositions

Inorganic acid containing

252 791, 252 794, 216 93, 216106, 216108, C09K 1304

Patent

active

055058728

ABSTRACT:
This invention relates to the removal of lead from spent ferric nitrate based solder strippers, the regeneration of the spent ferric nitrate based solder strippers, and the reuse of these solutions at least one time. It comprises a method and process for precipitating lead salts from used acidic solder strippers which are employed to strip solder coatings, including the underlying tin-copper alloy, from the copper substrate of a printed circuit board. The method includes the use of sulfate ions which are directly added to an aqueous solution of spent solder stripper, without neutralization of the spent solder stripper, optionally in combination with nitric or methylsulfonic acid addition. After precipitation and removal of the lead salts, additional components of the solder stripper composition may be added to substantially restore the initial functioning of the solder stripper.

REFERENCES:
patent: 4112191 (1978-09-01), Anderson
patent: 4673521 (1987-06-01), Sullivan et al.
patent: 4713144 (1987-12-01), Schiller
patent: 4921571 (1990-05-01), Kukanskis et al.
patent: 4957653 (1990-09-01), Cordani
patent: 5219484 (1993-06-01), Krulik
patent: 5244539 (1993-09-01), McGrath et al.

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