Separation and Recovery of Nickel from Spent Electroless Nickel-Plating Solutions with Hydrometallurgical Processes
- Separation and Recovery of Nickel from Spent Electroless Nickel-Plating Solutions with Hydrometallurgical Processes
- electroless plating; electrowinning; nickel; precipitation; recovery
- Issue Date
- Separation science and technology
- VOL 48, NO 11, 1602-1608
- A method of recovering nickel from spent electroless nickel-plating
solutions has been investigated through the electrowinning method,
following the precipitation of nickel by adding alkali and then dissolving
this nickel precipitate with sulfuric acid. When sufficient caustic
soda was added to a spent electroless nickel-plating solution to
increase the pH to higher than 13, fine nickel particles, below 4
microns in size, along with nickel hydroxide were formed. After filtering
the nickel precipitate, it was dissolved with a sulfuric acid solution
of over 2 vol%, with which more than 95% of the nickel precipitate
could be dissolved. For nickel recovery by electrowinning, the pH of
the nickel solution required an adjustment of nearly 2.0.
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