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CONVERSION OF NICKEL SLUDGE INTO A PLATING SOLUTION

IP.com Disclosure Number: IPCOM000025596D
Original Publication Date: 1986-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 73K

Publishing Venue

Xerox Disclosure Journal

Abstract

Some electrolytic and electroless nickel plating processes utilize nickel sulfate, nickel chloride and nickel sulfamate as plating solution components Waste solution is normally generated during these plating processes, particularly in the form of rinse water used to rinse the plated product and from contaminated or exhausted plating baths

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XEROX DISCLOSURE JOURNAL

CONVERSION OF NICKEL SLUDGE INTO A PLATING SOLUTION Gediminas Jakubonis

Proposed Classification
U.S. CT. 204149 Int. Cl C25d 3/12

Some electrolytic and electroless nickel plating processes utilize nickel sulfate, nickel chloride and nickel sulfamate as plating solution components Waste solution is normally generated during these plating processes, particularly in the form of rinse water used to rinse the plated product and from contaminated or exhausted plating baths

Conversion of this waste material into a usable plating solution begins with raising the pH to about 10 using sodium hydroxide A polyelectrolyte IS added at this point to promote precipitation of nickel hydroxide

The precipitated sludge is then dewatered with the aid of a filter press. The resulting filtered nickel hydroxide is in the form of a cake that is about 30 percent dry. This cake is then made into a slurry using 90 percent de-ionized water and 10 percent acid The acid selected may be either sulfuric acid or sulfamic acid depending upon the type of plating employed The concentration of acid may be adjusted to achieve the properties desired in the final product.

This nickel sulfate solution is filtered through a series of fiber filters and carbon filters to remove soil and organic material so that the final solution 1s usable in a plating solution.

The reclaimed nickel sulfate solution has been mixed with commercial sodium hypophosphite solutions and used in electroles...