Occidental Chemical Corporation

Robert R Bonk

Wei-chi Ying

A process for removing nickel and phosphorus species from a spent electroless nickel plating solution is described. This process involves an initial precipitation of phosphite values from the plating solution, followed by oxidation of hypophosphite and remaining phosphite to phosphate values, and the final removal of phosphate and nickel by lime precipitation. The treated plating solution is then separated from the precipitants, such as by filtration, and preferbly contain less than 1 milligrams/liter of nickel and/or total phosphorus species. This process is a cost effective method for treating spent electroless nickel plating solutions which is readily adaptable for on-site use.

Growing community of inventors

Tonawanda, NY, United States of America

Robert R Bonk