Recovery method of nickel from spent electroless nickel plating solutions by electrolysis
AssigneeKorea Institute of Science and Technology
InventorsHwa Young Lee, Byung Won Cho, Joong Kee Lee
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Abstract
A recovery method of nickel according to the present invention comprises pretreatment step to prepare a solution for electrolysis by adding hexanesulfonate salt to a treatment solution including nickel, and nickel recovery step to recover nickel in a metal form by electrolysis of the above solution for electrolysis. The present invention can produce nickel in high purity with simple process with low cost, and can recover and reproduce nickel in a metal form with at least 99.5% of high purity and at least 90% of recovery rate.
Claims16
A nickel recovery method comprising:
- adding hexanesulfonate salt to a treatment solution that comprises ionic nickel such that a mole ratio of the ionic nickel and the hexanesulfonate salt is between about 1:2 to about 1:7;
- adjusting a pH of the treatment solution with the added hexanesulfonate salt to be between a pH of about 4 to about 5;
- installing an anode and a cathode into the treatment solution with the added hexanesulfonate salt;
- electrolyzing the treatment solution with the added hexanesulfonate salt to reduce the ionic nickel to metallic nickel on the cathode wherein the metallic nickel comprises a purity of at least 99.5%.
A nickel recovery method comprising:
- adding hexanesulfonate salt into a spent electroless nickel plating solution so that a mole ratio of ionic nickel in the spent electroless nickel plating solution and the hexanesulfonate salt is between about 1:2 to about 1:7;
- adjusting a pH of the spent electroless nickel plating solution with the added hexanesulfonate salt so that the pH is between about 4 to about 5;
- installing an anode and a cathode into the spent electroless nickel plating solution with the added hexanesulfonate salt;
- reducing the ionic nickel in the spent electroless nickel plating solution with the added hexanesulfonate salt into metallic nickel onto the cathode in which the metallic nickel comprises a purity of at least 99.5%.
Dependencies are inferred from the claim text.