Homebrew PCBs

On 4/02/2010 13:39, James wrote:
>
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, "nathan_h_tna"
> <nathan_h_tna@...> wrote:
>  >
>
> As someone else said, the dissolved copper is the problem with disposal,
> it's highly toxic to marine life even in very dilute quantities. Either
> solution can be neutralized and/or evaporated and the solids disposed of
> in the trash.

CuCl2 is hygroscopic and difficult to evaporate. Garden or builders lime 
is a cheap source of impure calcium hydroxide and is good way to 
nutralize (i.e -> copper hydroxide and calcium cloride) followed by 
evaporation to a solid. Another way is to not neutralise and throw in 
excess scrap aluminium, in a closed container.  After a few days you 
should have crystal clear liquid with a brown sediment of copper metal 
sludge plus some unreacted aluminium.

Adam