METHOD AND APPARATUS FOR REGENERATING ELECTROLESS NICKEL PLATING LIQUID

PROBLEM TO BE SOLVED: To provide a method and an apparatus for regenerating electroless nickel plating liquid by which plating characteristics can be improved by obtaining regenerated plating liquid containing impurities as less as possible, and useful components such as nickel and chelate can be prevented from losing to enhance the economical efficiency. SOLUTION: In the method for regenerating electroless nickel plating liquid, the electroless nickel plating liquid mainly consisting of hypophosphorous acid aqueous solution containing nickel ions (Ni2+) forms original liquid, aged liquid containing byproducts in the electroless plating 1 is subjected to the dialysis with a piezodialysis membrane 2 to separate the byproducts contained in the byproduct containing liquid from the original liquid, and the regenerated liquid with the byproducts being removed therefrom is returned to the original liquid 4. Further, calcium salt or calcium salt and barium salt is added to the separate liquid containing the byproducts, phosphite ions and sulphate ions as the byproducts in the separate liquid are subjected to the precipitation and separation 3 as insoluble compounds, and the regenerated liquid with the precipitated insoluble compounds being separated therefrom is returned to the original liquid. COPYRIGHT: (C)2010,JPO&INPIT