Homebrew PCBs

well, neutralizing with develpoer will remove the etching behavoir....

BUT the copper (which is a heavy metal i think, potentially dangerous to 
environment) is still in there.

I have no idea how much it is, or if it is poisonous (or if there is more 
washed off big copper roofs).

I read about "regenerating" machines using steel wool, about electrolysis 
for getting the copper out.
(not sure if electroplating will work with fe3cl)
I also read about "mix it with cement after nautralization and dump the 
concrete".


You see - i don't really know.

But other thoughts...
I read that Fe3Cl is actually used by sewage cleaning facilities to help to 
clean
the sewage water (sure no copper contamination here).
Also often as a positive property of fe3cl "not too bad to environment" is 
listed...

Most likely such things are not legal to dump in the drain.
But often this is hard to find out (because homebrew pcb making isn't 
popular...).
If possible without "alerting" the authorities check with your local 
laws...


Where I live such "dangerous" waste can be brought to local collection 
facilities.
But i fear in my village the guys from the responsible facility wouldn't 
know what to do either...

maybe after neutralization it will just work to let the water evaporize and 
then dump the residue.


I changed to Hcl H2O2 process. there is no waste. that's good.

I think i told you everything i know about this, hope you find a chemist 
with more precise information.

You know - there is this saying among chem. engineers: "the solution to 
pollution is dilution" ;-)

Stefan





On Thu, 16 Oct 2003 15:43:30 -0000, mr_gees100_peas <geovar13@...> 
wrote:

> I'm new at this and I want to do my first pcb. I have a cad software, 
> copper board, ferric chloride, drills, ect, ect. By doing a lot of 
> reading I think I have a god idea on how to do it. However, of all the 
> webpages and articles I found on how to make a pcb non of them talk about 
> what to do with the left over feric chloride. I don't think my sewage 
> piping would like me dumping the stuff down the toilet and neither would 
> the enviromentalist. So, my question is, what am I suposed to do with the 
> feric chloride once I make my first pcb? Do I have to take it to a 
> collectionn falicility? Is there a way to neutralise it so I can dump it 
> in the drain and is so, is this legal or good to do?
>
>
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