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Recover Copper from Nitric Acid Mixed with Copper

12/25/2016 8:57 AM

Hello everyone, today i etched one copper clad glass epoxy sheet to make one sample PCB, i use nitric acid to remove unwanted copper, to make PCB with require copper tracks on it,then i feel during etching process that copper mixed up with the nitric acid solution, so any how can i recover that mixed copper from solution of copper mixed nitric acid... please tell me if its possible to recover... Thank you so much in advance.

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Guru

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#1

Re: Recover copper from nitric acid mixed with copper

12/25/2016 9:25 AM
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Guru

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#2
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Re: Recover copper from nitric acid mixed with copper

12/25/2016 1:07 PM

I should add that recovering the copper is far more bother than it's worth.

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Guru

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#3
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Re: Recover copper from nitric acid mixed with copper

12/26/2016 12:55 PM

Right, the cost of chemicals might be more than the value of the copper. And how would someone sell or use that amount of copper that is not in a usable form, e.g., wire. It might be worthwhile for a business etching hundreds or thousands of boards.

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#4
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Re: Recover copper from nitric acid mixed with copper

12/26/2016 1:16 PM

Indeed, it is a waste of time unless high volumes of Cu are processed.

A company I worked many years ago for built wet process PWB equipment and one piece of those lines was a Cupric Chloride CuCl2 etcher. (Other etch chemicals and machines could also be used, depending on many variables) The etchant was regenerated and the etched Cu was recovered.

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Guru

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#5

Re: Recover Copper From Nitric Acid Mixed with Copper

12/26/2016 2:53 PM

Alternately you might aim to recover the nitric acid and also get CuO (which has several uses as well).

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Guru
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#6

Re: Recover Copper from Nitric Acid Mixed with Copper

12/27/2016 2:36 PM

There may be a unique way to concentrate the copper ions from a solution in (dilute) nitric acid. Possibly ion exchange can be utilized, although concentration of hydrogen ions (protons) needs to be reduced for the ion exchange to take place. One would then flush away the copper ions using salt, sodium sulfate, etc.

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#7

Re: Recover Copper from Nitric Acid Mixed with Copper

12/28/2016 3:20 AM

Electrolysis: just plate the copper onto the negative electrode.

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#8
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Re: Recover Copper from Nitric Acid Mixed with Copper

12/28/2016 9:49 AM

The pH would obviously have to be adjusted somewhat, since nitric acid dissolved the copper in the first place, right?

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#9
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Re: Recover Copper from Nitric Acid Mixed with Copper

12/28/2016 11:26 AM

<...nitric acid dissolved the copper in the first place...> In that case the dissolved species would be the various nitrates of copper, and not the original nitric acid.

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#10
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Re: Recover Copper from Nitric Acid Mixed with Copper

12/28/2016 12:20 PM

Does it not depend on the relative amount of original nitric acid, and the amount of copper oxidized by said acid? That acid might be still strong enough to continue to remove whatever the electrode process is depositing, with emission of nitrogen oxides.

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#11
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Re: Recover Copper from Nitric Acid Mixed with Copper

12/29/2016 9:41 AM

I wonder how successful ion separation could be with a Kelvin water dropper elecrrostatic generator type set up.

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#12
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Re: Recover Copper from Nitric Acid Mixed with Copper

12/29/2016 10:18 AM

I think the charges in solution must be balanced, or it would provide a lethal shock to anyone touching the solution (this is before attempting Kelvin water dropper).

Good luck with that experiment, for all I actually know about that by experience, it could work, and I would not have a clue why.

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