Refinery
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Silver electrolysis purification
Do I need silver nitrate as electrolyte or can I use copper nitrate as well since it is much cheaper? I would use SS anode and junk silver items as
cathode and electrolyse them this way. Would this work?
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gdflp
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No you cannot. The entire purpose of that method is to reduce the concentration of contaminating metals(such as copper) in the silver by selectively
dissolving and reprecipitating pure silver metal. If you used copper nitrate as an electrolyte, you would initially precipitate pure copper, then
most likely a mixture of copper and silver, but most certainly not the pure silver you're after. You might be able to use a dilute solution of nitric
acid, so long as the concentration is low enough that it won't attack either metal, but I am unsure if this will work. In the end, you will end up
with a silver nitrate solution as your electrolyte regardless of what you use initially, so you might as well just use it to begin with.
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Metacelsus
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Wouldn't you want to use a junk silver anode and a pure silver cathode? The silver will dissolve from the anode and deposit on the cathode. Impurities
will become sludge, or stay in solution. You'll need to keep the voltage controlled to ensure purity. For a reference (with copper): http://chemwiki.ucdavis.edu/Core/Inorganic_Chemistry/Descrip...
[Edited on 5-5-2016 by Metacelsus]
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Refinery
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Nitric acid is currently banned in EU area so I was thinking alternative routes. If must, I will make some HNO3 and go with it then.
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aga
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You can still buy Silver Nitrate and it'll end up cleaner/purer than making it yourself.
I think a member here called 'hegi' was selling some. Top quality too.
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