Patent
Method for recycling electroless nickel plating waste solution
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TLDR
In this paper, a method for recycling an electroless nickel plating waste solution in which nickel and phosphorus are respectively separated and collected by a relatively small facility at a low cost is proposed.Abstract:
PROBLEM TO BE SOLVED: To provide a method for recycling an electroless nickel plating waste solution in which nickel and phosphorus are respectively separated and collected by a relatively small facility at a low cost SOLUTION: The recycling method comprises a first step of manufacturing an acid electroless nickel plating waste solution B below pH2 by adding inorganic acid to electroless nickel plating waste solution A, a second step of adjusting the acidity to pH2-7 by adding a calcium compound to the electroless nickel plating waste solution B to obtain an electroless nickel plating waste solution C with sediment containing calcium phosphite and calcium sulfate to be generated removed therefrom, and a third step of adjusting alkalinity to ≥ pH95 by adding alkali agent to the electroless nickel plating waste solution C to separate the sediment of nickel hydroxide to be generated from an electroless nickel plating waste solution D with nickel hydroxide removed therefrom COPYRIGHT: (C)2005,JPO&NCIPIread more
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Method and apparatus for recovering nickel from nickel-containing aqueous solution
Tetsuo Oka,徹雄 岡 +1 more
TL;DR: In this paper, a new method and an apparatus for recovering nickel from nickel-containing aqueous solution with which the nickel can efficiently be recovered from the used plating solution and the recovered nickel can be reused.
Patent
Treatment method for electroless nickel plating solution
TL;DR: In this paper, a treatment method for electroless nickel plating solution comprises the following steps: using a spent electroless Nickel plating bath to produce a powder; during a powder coating process, stirring spent electro-less nickel polishing bath to which powder is added, and heating a supplemental solution having sodium hypophosphite, allowing the spent electrolytes to change from a nickel-rich blue solution to a white transparent solution, and then stirring and heating again; performing advanced oxidation, filtering out the produced nickel-hydroxide white precipitate, and adding same to the