[pure-silver] Re: Home made silver recovery unit

Hi Mark,

Here's the reference L.F.A. Mason, Photographic Processing Chemistry,
The Focal Press (London:1966) pp 189 - 191.

I read it quickly this morning and there's much more to it than just
dipping electrodes into the fixer.  There is a problem with sulfiding if
the fixer is not agitated among others.  The most promising system seems
to be the low current method, 20 - 40 milliamperes per square foot.  The
downside is that recovery is slow but solutions containing as little as
0.1 g/l of silver can be handled.  Good luck.  If you can't locate a
copy of the book I can Xerox the pages and mail them to you, I don't
have a scanner at present.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Blackwell
Sent: Thursday, July 13, 2006 11:10 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Home made silver recovery unit


Thanks Jerry Id appreciate it and I am also going to do something
drastic. 
Im gonna check the library this afternoon to see what turns up there.

At first glance this just doesn't look that hard.
----- Original Message ----- 
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, July 13, 2006 10:55 AM
Subject: [pure-silver] Re: Home made silver recovery unit


I believe that Mason has a discussion of electrolytic silver recovery
and a picture of a typical setup.  There is a certain minimum voltage
needed and the current density of the system determines the recovery
rate.  I'm at work and can't remember the book title but can get it if
you wish.  Mason is one of the older standard texts on photographic
chemistry.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Blackwell
Sent: Wednesday, July 12, 2006 8:30 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Home made silver recovery unit


After dealing with a silver bucket and seeing a show on the history
channel the other day, I got to wondering if making a silver recovery
unit was practical.

What got me thinking was the show on the history channel showed what
they called a Bagdad battery that was really nothing more than a piece
of iron and a piece of copper placed in vinegar that produced about 1
volt.  In the process of speculating what such a battery might have been
used, one of the most likely uses was plating of metals ie gold or
silver plating coins.

The light goes on.  If it would plate a coin, why wouldn't it pull the
silver out of fixer and have effectively silver plate an electrode
without spending an arm and a leg on a commercial silver recovery unit.

First electricity and water issues came to mind with safety being first.
At 1 volt there is nothing to worry about, but I am not about to try
this with
120 ac. lol   Yet a 6 volt, lattern battery probably would last a long
time
or maybe a 12 volt transformer plugged into an outlet with a GFI on it
should be relatively safe shouldn't it?  Either that or some
rechargeables wired into something that would be quick and easy to
change.

The next issue would be to know just how long this would need to run to
recover the necessary silver..  The test strips should tell me when its
low enough, but if it takes 3 weeks to deal with a gallon might as well
let it evaporate.  Anyone have a guess on how quickly the process would
work?

Ok guys what am I missing here.  It can not be that easy or is it.

Mark

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