[Jewelry making - Article 00021] - Re: [Orchid] Refining Silver from film recovery

[Elizabeth A. Guynn]

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    While I'm not entirely familiar with silver recovery from regular
    film I am pretty well versed in the recovery from x-ray film.  There
    are primarily 2 available methods: 

    1. bath to remove silver (bath contains cyanide
    mixture)>cartridge>refine 

    2. bath to remove silver (bath contains a relatively non-toxic
    protease based detergeant)>precipitation of silver>decant liquid
    from silver sludge>dry silver sludge>smelt 

    The second method is the one now widely used in the industry as it
    is less toxic.  Silver is adhered to x-ray film by a gel formed from
    animal fat rendering. A protease based detergeant dissolves this
    layer fat allowing the silver to precipitate to the bottom of the
    bath.  The silver can then be recovered.  The drying and smelting
    process burns off any clinging gel leaving a pure silver product. I
    do not recall the name of the protease based detergeant right off
    but I do know that Eastman Kodak can tell you how to obtain it. 

    Good Luck! Liz PS.  I am well versed in this because as an
    environmental enforcement officer I have shut down one and helped to
    straighten out several of these type facilities (commercial not DIY).


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