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Author Topic: Brass Etching - chemical residue  (Read 2028 times)
christoffer
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Denmark Denmark



« on: January 30, 2011, 05:44:54 pm »

Hello! this is something that ive been wondering, if you are etching brass in salt water, the chloride ions and copper/zinc ions in brass will form CuCl2 and ZnCl2 as far as i remember, those salts i believe is harmfull and/or hazardrous for the environment, what do you do with the residue etching saltwater solution full of CuCl2 and ZnCl2 ?
give it to a recycling station or?
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von Corax
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Prof. Darwin Prætorius von Corax


« Reply #1 on: January 31, 2011, 05:29:30 am »

I'd mix it with a good dose of washing soda (sodium carbonate, Na2CO3), then let it stand overnight. The reaction gives you copper (II) carbonate (CuCO3) and zinc carbonate (ZnCO3), both of which will precipitate out as a solid, and sodium chloride.
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