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Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Netralising the stuff with bicarbonate of soda or garden lime (CaCO3 will stop it being nasty and corrosive, but it won't stop Cu being toxic (incidentally the iron is toxic too, but less so). You still need to get rid of the stuff at a hazardous waste disposal site. Short of separating the Fe from the Cl by adding excess NH3 then aeration to make sure all the Fe is oxidised to Fe(III), filternig the Fe(OH)3 off from the copper/ ammonia complex (which dissolves paper btw). then reprecipitating the Cu by evaporatig off the copper, then smelting the Cu and Fe to recover the metals I can't thhink of a solution to the problem other than the waste disposal companies. OTOH, neutralising it with NaHCO3, settling out the mixed hydroxides/ carbonates and roasting them would give an interesting oxide mixture to use for thermite experiments. Of course, after the thermite is done you still have a toxic mess, but it was more fun in the meantime.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I would have mentioned the Ammonia neutralization and separation (which I have done several times) but its rather difficult and the Ammonia is difficult to work with.
The really strong Ammonia requires a respirator and goggles because it gives a very cold stinging/burning while working with it. Also Ammonia can cause asphyxia and death, so I was avoiding that one.
It's doable if you are patient and careful, and have a gallon or so of the strong stuff.
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
iirc if you have too much ammonia, it forms complex ions with cu2+, adn that stuff is soluable. If you jsut use liek NaOH, it will just ppt, and i mean NaOH isn't that bad, you dont' have to work with the concentrated stuff.
So, what i would do is, Put XS NaOH in there,filter and wash the ppt, then neutralize the liquid with whatever acid you have handy. if not warm NaOH helps with clogged sinks, too. LOL
Registered Member #222
Joined: Mon Feb 20 2006, 05:49PM
Location:
Posts: 96
You can precipitate the metal ions by using aluminum foil, then filter and neutralize the solution to get gelatinous aluminum hydroxide. The reaction is extremely exothermic though.
Registered Member #8
Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214
One option if this is a fairly small scale operation, which I'm assuming it is, is to just distill it down and be left with a low volume sludge (or you could dry it to powder too even), which you could either dispose of more easily, or refine for recovery of useful chemicals. The majority of your volume left over would be just water or water with much lower contamination depending on how thoroughly you distilled it. Of course you need an all glass/teflon distillation apparatus for that, but I claim one can be had (ebay) for the cost of not too much hazardous waste disposal. Obviously if you etch a lot of boards you aren't going to be spending the time or energy to distill the waste, but if you have low volume it won't be a problem.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
the solution i heard of is to neutralise it, then add the liquid to the appropriate amount of plaster of paris. then mix and wait for it to set, then dispose of as inert waste.
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How to neutralize FeCl3
