plating, anodizing, & finishing Q&As since 1989
Regenerating Phosphoric Acid
Is there a method for the removal of iron from my phosphoric acid bath (so that I can keep using it)? I have heard that it is possible to use a cathode to precipitate out iron after it has been oxidized, but that a catalyst is necessary.
Any help is appreciated.
Thank you,Vinnie Stocks
trophy plating company - Daytona, Florida
You can also consider using ion-exchange anionic resins for acid retardation process. Such resins in the first passage keep acid and let metal go out; in the second passage, demi water displaces metal-free acid. In your case, in the first passage you have iron and a small percentage of phosphoric acid, in the second one phosphoric acid (virtually iron-free). This process works only if iron is more than few grams/litre.
- Sulmona, Italy
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