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tom haggen
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I thought about it today at work, and I was thinking i liked the idea of just disolving the rods HCl. Since AgCl is insoluble and every thing else
just stays in solution. The only thing is where to go once I have silver chloride? Is there an easy way to convert it into silver nitrate? I would
much rather have silver nitrate than silver chloride.
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neutrino
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The silver shouldn't be attacked, providing you exclude oxygen from the acid.
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tom haggen
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What about using aqua regia?
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Fleaker
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Aqua regia will give you silver chloride, it impedes further chemical action. It's a common problem with high silver alloys and why gold refiners
dilute the alloy with copper: makes it easier for the silver to go into soln.
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tom haggen
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so since the alloy I have is such a low percentage of silver, no silver chloride will precipitate?
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Fleaker
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At 5% silver, you might still have problems with silver chloride buildup on the outside of the metal that is being digested. I suggest melting it and
shotting it (to get rid of phosphorus by melting in an oxidizing atmosphere). Then dissolvein nitric acid which will put everything into solution
assuming it's just copper, silver, palladium, and less noble base fillers.
Do you know the exact composition of the alloy?
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Mr. Wizard
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I just checked ebay, and the sil-phos silver solder is going for &12.50 a pound plus $4 shipping. Why mess with purifying it? Sell it and save
yourself the trouble. If you just want silver you can buy it with the profits. A happy solution ;-)
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Fleaker
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I agree, you can make a lot more money by selling it for what it is than by refining it.
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Ephoton
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yep
aqua disolve watch out for the no2 gas.
if you dont get any gas its not working.
make aqua from one part nitric acid to 3 parts hydrochloric.
once disolved distill multiple time but never to dryness by adding hydrochloric acid when nearly dry.
once all nitric is gone dilute with water
then percipitate with your choice of reducing agent (ferrous ion, oxalic or formic acid, sulfites and so2, metalic zinc
ect ect)
collect your gold and wish you lived in oz near a reef 
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Ephoton
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now other metals
if you want the plat group out of a solution it gets harder.
you must be more selective of your reducing agents.
first a oxalic acid drop is my choice then
ammonium chloride to get the group.
fire up the group then redisolve in clean
aqua.
oxidize solution to put palladium in a different oxidation state than platinium.
drop Pt with ammonium chloride. then
make solution basic with ammonia to drop
Pd
if you want silver buy a braclet
Os and others are realy hard and require
molten alkali disolves (realy nasty)
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Ephoton
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silver
silver will not disolve in aqua but it will disolve in nitric acid.
if you do an aqua disolve and find white powder at the bottom of you flask you could possibly have silver.
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