[pure-silver] Re: Silver Recovery

Richard,
I used a stainless steel sheet and a carbon rod. adjust the the distance to 
avoid  an over current (protect any copper wires or screws with silicone 
caulking compound). The deposit is almost 99% pure silver, hit the steel plate 
on top of a newspaper over a hard surface or scrape it out with a stainless 
steel spatula. I used it to do silver nitrate, but now I prefer to buy
Jacques
  ----- Original Message ----- 
  From: Richard Knoppow 
  To: pure-silver@xxxxxxxxxxxxx 
  Sent: Friday, December 28, 2007 1:14 AM
  Subject: [pure-silver] Re: Silver Recovery



  ----- Original Message ----- 
  From: "Mark Blackwell" <mblackwell1958@xxxxxxxxx>
  To: <pure-silver@xxxxxxxxxxxxx>
  Sent: Thursday, December 27, 2007 5:40 PM
  Subject: [pure-silver] Silver Recovery


  >I am finally ready to build the silver recovery system I 
  >have been planning for some time.  Id welcome comments.
  >
  > First I have tons of old dc wall transformers that are 
  > left over from things like old telephones, answering 
  > machines and any of a host of electrical devices.  As long 
  > as its DC current it should work.  Yet I may have some 
  > choice of voltages, if there is an  ideal voltage I should 
  > look for Id appreciate it.  I think most of the old ones 
  > are in the 6 to 12 volt range.
  >
  > It will be plugged into a power strip that is plugged into 
  > a GFI socket.  I guess it could be plugged into the GFI 
  > directly, but it wouldn't be as easy.  Still as long as 
  > the strip is plugged into the GFI, it should be relatively 
  > safe.
  >
  > As far as circulation I am planning to use an air pump to 
  > just move the water around enough to allow enough 
  > circulation around the electrodes to keep it working.  As 
  > far as the electrode material, I know one has to be copper 
  > but can't both be or does the other electrode need to be a 
  > different material such as stainless.  I have a couple of 
  > options on how to attach the wires.  The copper side I am 
  > planning on using a piece of either copper plumbing pipe 
  > or heavier copper wire.
  >
  > As far as the container, I am planning to use a large 
  > plastic type of tote   Rubber will be ideal if I can find 
  > it, but it sure won't be metal.
  >
  > What am I missing now before I actually start building?
  >
  >
      I did a Google search but did not find any specific 
  instructions. However, a more thorough search may turn 
  something up. From what I did find it appears that in-line 
  electrolytic recovery is not trivial to implement. The 
  advantages of the technique is that it can regenerate fixing 
  baths or bleach-fixing baths. Also the purity of the 
  recovered silver is high. However, in order to dispose of 
  the baths they must be subsequently treated with some other 
  kind of recovery device such as a metallic replacement 
  system or activated charcoal filter because the silver level 
  is too high to meet environmental protection standards.
      In terms of cost a metallic replacement filter appears 
  to be best. These are not suitable for regnerating purposes 
  but can reduce the silver content of spent solutions to the 
  point where they are no longer environmental hazards, at 
  least not from the silver, but the recovered silver may be 
  worth the effort. One site I looked at estimated the value 
  of the silver from a spent B&W fixing bath at around $1.50 
  US (sounds a little high to me). color processes remove all 
  the silver from the film so the value of the recovered 
  silver may be even higher.

  ---
  Richard Knoppow
  Los Angeles, CA, USA
  dickburk@xxxxxxxxxxxxx 

  
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2:14 PM

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