Homebrew PCBs

On Tue, 17 Apr 2007 00:43:19 +0200, simeon webber <vsmvdd@...>  
wrote:

>
>
>> Can I dry the copper hydroxide? How should it be stored?
> Same as any chemical. In a clearly labeled container and away from
> children who likely to try eat it. Its a copper compound.
> Label your chemicals for other peoples sake.
>
>> My goal here is to reduce the volume of waste by extracting the
>> water, and identify the substance to the hazard waste facility.
> yes, your on track. One way is to have a small bucket or pail with a lid
> that you can periodically dump in sludge. Keep the bucket open and by
> time you ready to dump more sludge the previous lot will be dry.
> You've already done the hard work of neutralizing, precipitating and
> removing the bulk of liquid (NaCl/NaOH solution).
> Adam


Could the copper salt not be collected and given away as new etchant?
I'm not sure it even needs neutralizing, CuCl dries to a green salt. Does  
adding Na. make it less useful for further use? Could the HCl be reduced  
by etching "until it stops"?

Remember the copper chloride "boiler cleaning sticks" we saw a while ago  
as possible source for CuCl? Maybe CuCl could be burned to achieve a  
similar effect with no harm done? What results when CuCl is burned?

ST