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Title: Recovery process for electroless plating baths

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.

Inventors:
 [1];  [2]
  1. (Farragut, TN)
  2. (Knoxville, TN)
Publication Date:
Research Org.:
LOCKHEED MARTIN ENRGY SYST INC
OSTI Identifier:
868281
Patent Number(s):
US 5112392
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
recovery; process; electroless; plating; baths; removing; spent; metal; bath; solutions; accumulated; byproducts; counter-ions; deleterious; effects; solution; portion; passed; selected; cation; exchange; resin; bed; hydrogen; form; strong; acid; exchangers; combinations; intermediate; sodium; nickel; sorbed; exchanger; removal; constituents; remaining; subjected; sulfate; precipitation; calcium; hemihydrate; sequentially; cao; caco; phosphite; accomplished; addition; mgo; magnesium; trihydrate; washed; precipitates; steps; safely; discarded; nontoxic; land; fills; various; chemical; industries; finally; concentrated; adjusted; ph; reuse; removed; sulfuric; filtrate; forming; illustrated; applied; processing; strong acid; cation exchanger; nickel plating; electroless plating; cation exchange; exchange resin; sulfuric acid; recovery process; resin bed; calcium sulfate; plating bath; acid cation; selected cation; metal plating; deleterious effects; electroless metal; bath solution; resin selected; electroless nickel; deleterious effect; various chemical; /106/210/

Citation Formats

Anderson, Roger W., and Neff, Wayne A.. Recovery process for electroless plating baths. United States: N. p., 1992. Web.
Anderson, Roger W., & Neff, Wayne A.. Recovery process for electroless plating baths. United States.
Anderson, Roger W., and Neff, Wayne A.. Wed . "Recovery process for electroless plating baths". United States. doi:. https://www.osti.gov/servlets/purl/868281.
@article{osti_868281,
title = {Recovery process for electroless plating baths},
author = {Anderson, Roger W. and Neff, Wayne A.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}

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