Well that's another matter. I suggest this method
Originally Posted by CBG
ONLY for sodium thiosulfate fixers. I conducted an
experiment using H2O2, hydrogen peroxide, to
destroy the fixer and so release the silver.
At the time I had been using potassium
iodide as per Kodak's FT-1 test for
testing the fixer's condition.
All went as expected. The silver precipitated
as a brown-ish flocculant. Likely the oxide or
hydroxide of silver. Add acetic acid to that
and you've silver acetate. Dan
There was a guy on photo.net who seemed to know something about it. It seems like he told about everything you need to know, except how to build a power supply and how to know how silver is there to begin with.
If that guy were here right now, I'm sure he would agree with Ian that a rechargeable battery would be a good way to go for the hobbyists. Safe with reliable voltage control.
There is a tendency for pH to go down somewhat during desilvering, so if you use a hardening fixer with a fairly low pH (acidic), it's possible you might get precipitates forming. Probably safer to raise the pH a bit (perhaps to about pH => 6 ?), but I don't have any experience with such fixers (so I'm just guessing).
Aside from the loss of sulfite and pH shift, the fixer should not be harmed. Of course, if you want to, you CAN harm it with excess voltage. At any rate, it's generally not worth the trouble to reuse fixer. Disclaimer: not a chemist, electrical engineer, etc, just a guy who has some experience recovering silver.
I am seeking an easy, inexpensive way to recover silver from photographic processing solutions. I am particularly interested in a refiner/smelter who offers a vault storage account for reclaimed silver, if such a service exisits.
Any thoughts at all would be welcome. Thanks.
This topic comes up once in a while. Try the search function. There will show up threads like
this for example.
get yourself 2 or 3 iron core trickle tanks
run them in series, spent fixer as well as wash.
it will transfer iron ions for silver.
let your fingers do the walking through the yellow pages
look under electroplaters/refiners or waste haulers, and you will be
speak to a refiner who will supply you with the tanks, and to find out the best way
to see when the first is FULL, then trade it in, buy a new one
for the end, run them in series again and again.
don't get the other trickle tanks ( the ones that aren't iron core )
if they are not run continuously and are not wet all the time
they channel and don't work and are a waste.
My thanks to those who have replied to my request. I will pursue accordingly.
Five threads merged. Since the question of how to recover silver from exhausted fixer, or at least how not to dump it into the waste stream, comes up with some regularity, I'm adding this to our sticky threads.
These merged sticky threads are a bit of an mess really. It might be better to have an article on Silver Recovery for small scale users. This would be quite short and reasonably simple, it's an area I specialised for a bullion dealers n for a number of years.
It would be great to have such an article, and I encourage you to write it, if you are interested, but meanwhile we have a lot of dispersed threads that users don't seem willing or able to look for, so they start new ones on the same topic, and then this makes more redundant threads and scattered information, so we're doing what we can with the resources we have to try to focus these discussions.
We've talked about an FAQ, but for whatever reason, information structures on APUG that are ancillary to the main forums don't get that much traffic, and it's a lot of work to put together an FAQ, particularly if it isn't likely to be used. People come to internet forums to have discussions, so the object is to try to organize the information in a way that users seem to want it.
There's nothing worse than each Forum being filled with Sticky threads, and currently there are far too many as it is. I will write the Silver Recovery article but it will be a month or so before I'll get time.