The water is very close to colorless when the mud settles.
According to this table, copper carbonate has a solubility constant of about 1.4*10^-10 and iron carbonate has a solubility constant of about 3.2*10^-11. Both are essentially rock dust.
Cool!
Thanks! Rich
Add a little HCl to the mix and reuse!
Andrew
Chuck I read this and freaked out. This afternoon I called up the Waste Treatment plant where this stuff is headed (theres only two in the entire county one disposal and one treatment plant... its a county of about 28k people or so ...)
They handle all sorts of chemicals including the stuff used to develope pictures, etch boards, clean spills etc etc.
They were quite knowledgeable with FeCl ... at least they sounded like they were (I am not a Chemical Engineer so sue me).
And as I pointed out the mechanic KNEW what FeCl was. When I pointed out "hey be careful that stuff will eat through .." he replied "dont worry I know what it is"
To get over the guilt trip youve got me on, I am going to HUG a tree on my way home.
...
It only makes sense - they get paid for the recycled oil, they have to pay to have the other poisons disposed of.
Do better than that - if you see any litter along the way, pick it up and put it in the bin. :-)
Cheers! Rich
It should do, only it'll fizz a bit more than with washing soda.
the ocean's got plenty of iron (from rusting ships etc) and heaps of chlorine in it already, a little copper is unlikely to harm anything.
Bye. Jasen
And all of them also use FeCl3 at one stage or another to kill said bacteria and deodorize before it reaches your tap. Na2CO3 is a simple, cheap, and effective disposal method.
I knew a small PCB house that used to mix used FeCl with ordinary builders cement, and it did much the same.
Barry Lennox
"I'd like to add a suggestion about how to dispose of used etching solution. Before you pour it in to the sink, pour it in a plastic tank and drop there scrap of old steel nails, screws, small, nuts, bolts, etc., and let it stay for a few days. It will turn the hazardous mix of copper chloride and Ferric Chloride (FeCl3) into copper powder (sludge) that settles on the bottom and a non-etching and non-corrosive solution of FeCl2. It will save from corrosion, destruction and costly replacement in the future your cast iron drain pipes and it will save from killing bacteria in the septic tank or in sewer treatment plant. They are very sensitive to copper chloride and Ferric Chloride. A current law prohibits disposal of those chemicals in the sewer. For best yet treatment, after separation of solution of FeCl2, mix it with solution of soda (Na2CO3 used as detergent) in a flat tray lined with plastic film. It will turn FeCl2 into Fe(CO3) (insoluble rusty mud) and NaCl (harmless cooking salt). After drying outdoor whole dry rusty powder could be wrapped in plastic film and disposed of in the normal trash container." [From
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